Archives

Hermle wood-stick clock pendulum

Mechanical Clock PendulumsHow to orderPendulum TypesGerman UnitsHermle CM DescPendulum PartsLength IndicatorsTiming

Please view these information tabs to help with determining the proper Mechanical Clock Pendulums for your clock.

Sequential steps to pendulum obtainment

  • 1. Know who really made the movement. If the clock was made in Germany post WW2, it will be one of four makers. Hermle, Jauch, Kieninger, or Urgos. If none of these names are on the movement it is still, most likely made by one of these factories. They made movements for other clock makers who had their own name imprinted onto the movement because they were buying so many. Best to use the identification page to narrow down exactly who made the clock movement, then return to this page.
  • 2. Get the CM numbers, or PL numbers from the back plate of the movement itself. This will be matched up with what we are offering.
  • 3. Determine the bob diameter needed. Measure how wide the inside of the case is and then subtract 4 inches. This will be the maximum pendulum bob diameter allowed in the clock case.
  • 4. Decide between Lyre, Wood stick, or a brass rod pendulum if the options are there. They all come with a brass round bob for the end, but leading down to the bob can be any of these three styles.
  • 5. Order it
  • 6. After the pendulum is received and installed on the clock, Put The Clock In Beat.

Pendulum Measuring on a German Clock

Measure the pendulum for a German Clock from the very top of the movement down to the very bottom of the pendulum rating nut threads. If the clock says something like 94cm, choose 94cm from the list, making sure it also lists the correct bob diameter. Clockworks.com will calculate the length, making sure it is correct, before shipping it. A customer may receive the pendulum and think that it is not the correct length. Most likely, this is not the situation. Ordering a pendulum for a Hermle 94cm movement, does not mean you will get a 94cm long pendulum. The pendulum you get may be shorter, although it will be correct.

Determining Bob Diameter

Bob diameters vary so that they will not hit the sides of the case. Bob width is determined by the inside of the case width. Measure how wide the inside of the clock case is and then subtract 4 inches from that measurement. That measurement is the largest diameter bob that can be used in the clock case. A smaller diameter bob can be used, but not a larger one.

Pendulum clocks need to be put "In Beat"

After installing the new clock pendulum the clock will need an adjustment for it to run correctly. This is very easy to do and only takes a few minutes. No mechanical pendulum clock will run right without putting it "In Beat" first.

The content of this website is copyright by Clockworks and written by James Stoudenmire

Types of Clock Pendulums

After knowing who made the clock, it is time to decide what pendulum style is best. Clock pendulums can be divided into three basic categories. Very short mantle clock pendulums will use a mantle bob and these are not discussed in this section. If you have a short mantle clock please search for a mantle bob instead. What is covered here are the types of clock pendulums available for shelf, wall and floor clocks.

  • The brass rod style pendulum for small shelf or wall clocks.
  • Metal Lyre style pendulums for floor clocks.
  • Wood stick pendulums that are used on everything.
Types of Clock Pendulums

Metal Lyre

A metal Lyre style pendulum are used for floor clocks. A floor clock can mean a grandfather, grandmother, or granddaughter clock. We offer these for German post WW2 units such as Urgos, Kieninger, Jauch and Hermle units. These are the only post WW2 German units made, despite the fact it may something other than these names. The names may vary on the back plate because companies would pay to have there name on the movement instead.

Wood stick style clock pendulum

Wood Stick

The wood stick will come unstained. This is so the stick can be stained the proper color to match the clock case. The wood stick pendulum consists of the stick with the hardware and also the round bob. The good thing about wood stick pendulums is they can be shortened if needed.

Types of Clock Pendulums

Brass Rod

The brass rod types of clock pendulums are mainly used on shelf clocks or wall clocks. Sometimes they are used in grand daughter or grand mother clocks, but not as common. These cost more for two reasons, there made of brass and also they are custom cut to size by us here at Clockworks. We will cut it to the exact length you need for your specific clock movement upon your ordering.

The content of this website is copyright by Clockworks and written by James Stoudenmire

Grandfather Clock Pendulum Information

The length of the pendulum on German units comes in a few CM options. German units measure the pendulum from the top of the movement to the bottom of the nut threads. The pendulum itself, the leader it hangs on, and the suspension that the leader hangs on. All three components in centimeters make up that CM length in the drop down menu.

Pendulum length information

To know how long the actual pendulum is, subtract 15CM from the options with the pendulum length. This will exclude the leader and suspension, and be the actual pendulum length from tip to tip off of the clock. This length can vary as if a larger pendulum bob is selected, the actual length of the pendulum gets longer. Why the CM length matters at all is because if the pendulum length is not near the CM length of the movement, the clock will not keep time. So the gearing in the movement and the pendulum length works together to keep time around the specified CM length.

The bob width Options

A Lyre grandfather clock pendulum comes with either a 6 1/2, 8 1/2, or 10 1/2 inch bob diameters. The 'Bob' is the round disk at the bottom of the pendulum . The CM length on the movement will indicate the length of the pendulum from the TOP of the movement all the way down to the bottom of the pendulum nut threads. This is an approximate length that depends on other factors such as bob diameter and weight of the pendulum . Basically if the CM is 94CM the pendulum itself will be about 35 inches tip to tip off of the clock, and the 114CM option would put this same measurement at approximately 44 inches.

Hermle Clock Pendulum Measuring

If a Hermle clock doesn't keep proper time, the pendulum may be incorrect. To determine if this is the problem, all of the components of the Hermle clock pendulum need to be measured. Hermle clock pendulum measuring is extremely important. Often enough the CM length stamped on the movement is not the actual pendulum length. Certainly, the CM stamp provides valuable information, however it does not state what the Hermle clock pendulum needs to be from tip to tip. This section describes what the CM stamp represents, as well as how it needs to be measured.

What the CM represents

To measure a Hermle clock pendulum, start at the very top of the movement. Continue all the way down to the bottom of the rating nut on the pendulum. The CM number will only be accurate to the pendulum length if the bob diameter is small. In other words, the larger, or the heavier, the bob is, the longer the pendulum needs to be despite the stamped length on the movement. If confused, please email [email protected] in order to determine the best pendulum length. Please provide the CM length stamped on the back plate of the movement. Also, include the width of the pendulum bob. The bob is the round disk at the bottom of the pendulum.

Parts that are measured

The pendulum length (**cm) is the distance from the suspension post all the way down. Meaning to the bottom of the pendulum nut threads. This measurement includes the pendulum from tip to tip, the leader it hangs on, and the suspension spring. This pendulum length will not always be the same as what is marked on the movement. Subsequently there are also other factors that play into this measurement. For instance, the pendulum bob diameter. The larger the pendulum bob diameter, the longer the pendulum length needs to be despite the CM length.

Conclusion

In conclusion, if the CM length on the old unit matches the CM length on the new unit it will keep proper time with the same pendulum. There are times when the old leader needs to be used on the new movement, but this is not common.

The content of this website is copyright by Clockworks and written by James Stoudenmire

The Mechanical Clock Pendulum Assembly

The mechanical clock pendulum assembly does not mean just the pendulum alone. When the word assembly is used it means the pendulum consists of three components and not just the pendulum. A pendulum assembly consists of the suspension spring way up top, the leader that hangs on it, and then the pendulum.

Pendulum styles

Usually clock pendulum makers are not movement makers and the two are married together by a person or place. A place such as Clockworks.com or Howard Miller instead of the movement manufacturer. This is interesting because it explains why there can be so many variants of pendulums available for one movement. The pendulum could be a brass rod, wood stick, or metal lyre style.

Pendulum bob diameter size

What bob diameter sizing for the clock case so it both looks good and at the same time not wack the sides of the case. A good rule for the bob diameter is it needs two inches on each side to swing. So if the clock case is 12 inches wide the bob cannot be more than 10 inches. In this example we would need a 10 inch bob but these are not made. So the choice is clear that for a 12 inch wide clock case the bob size to get is 8 1/2 inch wide at maximum. If this rule is not used and the 10 inch wide is use the clock may go tick knock tock knock as it hits the sides each swing. Eventually the clock will stop running from this resistance.

Pendulum lengths

The length of the pendulum has to be correct for the gearing inside the movement. If the pendulum is too long the clock will be too slow. If the pendulum is too short the clock is too fast. When a clock is too fast or slow it usually has nothing to do with the movement itself. It only has to do with the pendulum length alone and nothing else.

Pendulum top mount hook

The top hook has to hook up to the movements pendulum leader. The leader is the part that holds the pendulum up in the air and is hooked to the suspension spring. Sometimes an old pendulum will not hook to the new movement the same way as it did in the past but this not common. A new top hook may or may not needed for the pendulum.

Pendulum leader

The leader is the 3 to 7 inch long part that the pendulum hangs onto. Installation of the leader is done in a way that it hangs onto the suspension spring on the top of the movement. At the same time it will have the crutch on the back of the movement engaged with the center of the leader. The crutch is the wig wag part that is sticking out of the back of the movement. Leader installation is done by removing the set screw on the top of the suspension spring. With the suspension free it can be lowered to hook onto the leader and be brought back up. The leader is hooked to the suspension and the crutch on the back of the movement at the same time. This assembly gets brought back up again to mount with the set screw like it was.

The content of this website is copyright by Clockworks and written by James Stoudenmire

The mechanical clock pendulum length

A pendulum clock without a pendulum is a shame for sure. Getting the correct pendulum does take some diving into the clock world. If you have no idea what pendulum it would take, this is a basic guide. This is a basic guide to narrow it down to the best pendulum for your clock. This will cover most situations, without special equipment to figure out the length.

The movement CM or PL stamp

On the back plate of the clock movement usually, there are some numbers and or letters for identification. There maybe an indication of how long the pendulum should be in the mix of these numbers. It may say CM or PL and this stands for centimeters or pendulum length. This would be the length where it should keep approximate time. This is measured in a few different ways usually dependent on country of origin.

German made movements

Most mechanical German made clock movements are easy to figure out the pendulum length. The numbers will let us know or the clearly indicated CM or PL number will be stamped. If it is German, keep in mind the CM length is not the actual pendulum length. German units measure this length from the top of the clock movement, and this includes the three components of the pendulum all in one length, in centimeters. This length will include the pendulum itself, the leader that it hooks to, and the suspension spring on the top that the leader hooks on to, all in one CM measurement. CM stands for centimeters and PL stands for pendulum length.

If no stamp try to convert

With no pendulum length stamped into the movement some added steps are involved. The numbers on the back plate will cross reference to the pendulum length required. The first step is to identify the manufacturer of the clock movement by using the movement numbers. The movement numbers indicate who actually manufactured the movement. Various clock retailers may have have their name stamped onto it, but the numbers are always true to the manufacturer.

Converting numbers to CM length

Some movements do not have an indication of the pendulum length on the back plate. The unit will have a number that would need to be found on this website first to find out what the correct CM length is for it.

Converted number example

Let's say that the movement has no CM stamp on the movement and only shows the number UW32319. Go to the identification page to look at the movement number examples. In this example, we see that it is a Urgos. Now it is possible to go to the Urgos page and find the number to see what the pendulum length is. In this example, the pendulum length would be 80cm, representing the full length with the size of the bob factored in.

German grandfather movements

Almost all grandfather clock movements are going to be German if made after 1950. The first thing we need to do is get the numbers off of the back plate of the movement. This is the only way, and we can't cheat by looking at the paperwork or clock case. It has to come right off the back of the clockworks. The manual and the sticker on the case is of no use to get the pendulum.

American clocks

The American mechanical clock movement manufacturers referred to the pendulum length as a "drop". The drop is the length of the pendulum from the hand shaft all the way down to the bottom of the pendulum rating nut threads. It is a different way of measuring the pendulum length then the German made way. Both ways are based on the smallest bob diameter bob. If the bob is larger or heavier, the length would be longer than what is stamped.

No luck

If everything fails for one reason or another, the best chance for a pendulum is the wood stick style. This is the only style of pendulum that can be easily modified because you can chop it. These types of clocks are usually antiques, or of Asian origin, and information such as pendulum length is simply not available. Sometimes it takes a good guess on where the manufacturer intended to have the bob sit.

To do it this way, you only need a pendulum with a stick that is way too long to begin with. Chop it, try it, chop it, try it. Each time your slow, cut an inch and half off of the sticks length and hang it back on. It will only take a couple of times, and if you start way too long you can always go shorter.

Clock makers method

There is another way, its called setting the beat rate. This is a more involved way and usually just done by clock makers. It involves a beat detecting device that counts out the beats per hour, or the beats per minute. To do this, first you would need to know what the beat rate is supposed to be for that particular movement, and then keep adjusting the pendulum length until you have it keeping time. There are cell phone apps out there these days that will tell you the beat rate and the cell phone will listen and tell you if the clock will keep time with that pendulum. You go longer or shorter until your phone says the beat rate is set.

Contacting us for help

Please email the movement numbers from the back plate, and explain what part is needed. The email address to send this information is [email protected] Pictures are welcomed but not required. If emailing pictures please include the back side of the clock movement where the markings are.

The content of this website is copyright by Clockworks and written by James Stoudenmire

Timing a mechanical pendulum clock

Timing the clock is all about the overall pendulum length and rarely has anything to do with the movement itself. Mechanical clock is easy to time providing you have the correct pendulum. When the pendulum is correct for that particular movement it will hang on the leader and keep approximate time. The fine timing can be done only with the pendulum adjustment located at the very bottom. At the bottom of the bob is some adjustment threads and a nut. To turn the nut one way raises the bob and the other lowers it. A shorter pendulum will make the clock run faster. A longer pendulum makes the clock run slower.

Fine timing the clock

If the clock is timing slow, raise the pendulum bob by turning the nut at the bottom of the bob. If the clock is fast, do the same but raise the clock's pendulum bob instead. One full turn is somewhere around 1-2 minutes a day faster or slower.

If there is no more adjustment

If the bob is all the way up and its still too slow or fast, you can shorten either the pendulum or the leader it hangs on to correct.

A lyre pendulum that does not keep time with the bob all the way adjusted will need its length altered. The overall length can be altered by the pendulum itself or the leader it hangs onto. The leader is about 5 to 7 inches long and engages with the crutch on back of the movement. The leader is the part that the pendulum top hooks on to. It is possible to shorten or lengthen the pendulum leader to put the clock in time range with some solder if needed. 1 3/4 inches is a good measurement to make one of these longer or shorter as needed, as this is the length of the threads at the bottom of the bob. So it will give you a full timing adjustment range all over again and you can go up or down as needed.

German pendulum length CM stamp

The pendulum length is considered overall and not just the pendulum. For example if the clock says 94cm on the back of it, this is the way the Germans measure there pendulum lengths from the top of the movement and all the way down. This will include the suspension spring way up top, the pendulum leader or guide you can call it, and also the pendulum from tip to tip all with a 4 1/2 inch bob diameter. Of course the larger the bob, the longer it will be beyond that 94cm measurement.

Used to keep time, now does not

If the clock kept time in the past but now does not, it means a worn gear. The escape wheel is worn and it is advancing more than one tooth at a time. The escape wheel alone would be hard to find, and hard to replace both. The entire movement would be disassembled to replace this worn escape wheel if there is another one found that will work. The cost of having this done would be the same price as a new movement. There is no such thing as having a repair on a clock movement being better than a new movement. The price would be about the same for a complete overhaul or a brand new one. First see if the clock movement is in production and available new. We do this by getting the numbers off of the back plate of the movement itself, right off of the brass. The email address is [email protected] and we will check availability and quote for the new one. If the movement is not in production anymore, then a repair is the only option.

Mechanical Pendulum Clock Timing Issues - Conclusion

Fine timing of the clock is easy as you can see. If the clock kept time in the past and now too fast, its time for a new movement and has nothing to do with the pendulum. A worn escape wheel is most likely the cause and a new unit would be less cost then a repair.

The content of this website is copyright by Clockworks and written by James Stoudenmire

Hermle wood-stick clock pendulum

Hermle wood-stick clock pendulum requires the CM number off of the Hermle clock movement itself. This information is not on the paper work and not on the wood case. Rather it would be a stamp on the brass clock movement's back plate instead. It will say a number such as 94CM or 114CM, some number followed by CM (centimeters).

Hermle indication

Hermle clock movement identification

Wood-stick Pendulum description

This Hermle wood-stick clock pendulum will come unstained so it can be stained the proper color to match the clock case. The wood-stick pendulum consists of the stick with the hardware and also the bob in the diameter chosen. The good thing about wood-stick pendulums is they can be shortened if needed.

Assembly instructions

The wood-stick clock pendulum will need to be assembled. This way it can be stained to the color of the clock case first. To assemble the pendulum the top hook gets attached to the top and the rating assembly on the bottom. Detailed information can be found at this link.

Hermle Lyre Clock Pendulum

Mechanical Clock PendulumsHow to orderPendulum TypesGerman UnitsHermle CM DescPendulum PartsLength IndicatorsTiming

Please view these information tabs to help with determining the proper Mechanical Clock Pendulums for your clock.

Sequential steps to pendulum obtainment

  • 1. Know who really made the movement. If the clock was made in Germany post WW2, it will be one of four makers. Hermle, Jauch, Kieninger, or Urgos. If none of these names are on the movement it is still, most likely made by one of these factories. They made movements for other clock makers who had their own name imprinted onto the movement because they were buying so many. Best to use the identification page to narrow down exactly who made the clock movement, then return to this page.
  • 2. Get the CM numbers, or PL numbers from the back plate of the movement itself. This will be matched up with what we are offering.
  • 3. Determine the bob diameter needed. Measure how wide the inside of the case is and then subtract 4 inches. This will be the maximum pendulum bob diameter allowed in the clock case.
  • 4. Decide between Lyre, Wood stick, or a brass rod pendulum if the options are there. They all come with a brass round bob for the end, but leading down to the bob can be any of these three styles.
  • 5. Order it
  • 6. After the pendulum is received and installed on the clock, Put The Clock In Beat.

Pendulum Measuring on a German Clock

Measure the pendulum for a German Clock from the very top of the movement down to the very bottom of the pendulum rating nut threads. If the clock says something like 94cm, choose 94cm from the list, making sure it also lists the correct bob diameter. Clockworks.com will calculate the length, making sure it is correct, before shipping it. A customer may receive the pendulum and think that it is not the correct length. Most likely, this is not the situation. Ordering a pendulum for a Hermle 94cm movement, does not mean you will get a 94cm long pendulum. The pendulum you get may be shorter, although it will be correct.

Determining Bob Diameter

Bob diameters vary so that they will not hit the sides of the case. Bob width is determined by the inside of the case width. Measure how wide the inside of the clock case is and then subtract 4 inches from that measurement. That measurement is the largest diameter bob that can be used in the clock case. A smaller diameter bob can be used, but not a larger one.

Pendulum clocks need to be put "In Beat"

After installing the new clock pendulum the clock will need an adjustment for it to run correctly. This is very easy to do and only takes a few minutes. No mechanical pendulum clock will run right without putting it "In Beat" first.

The content of this website is copyright by Clockworks and written by James Stoudenmire

Types of Clock Pendulums

After knowing who made the clock, it is time to decide what pendulum style is best. Clock pendulums can be divided into three basic categories. Very short mantle clock pendulums will use a mantle bob and these are not discussed in this section. If you have a short mantle clock please search for a mantle bob instead. What is covered here are the types of clock pendulums available for shelf, wall and floor clocks.

  • The brass rod style pendulum for small shelf or wall clocks.
  • Metal Lyre style pendulums for floor clocks.
  • Wood stick pendulums that are used on everything.
Types of Clock Pendulums

Metal Lyre

A metal Lyre style pendulum are used for floor clocks. A floor clock can mean a grandfather, grandmother, or granddaughter clock. We offer these for German post WW2 units such as Urgos, Kieninger, Jauch and Hermle units. These are the only post WW2 German units made, despite the fact it may something other than these names. The names may vary on the back plate because companies would pay to have there name on the movement instead.

Wood stick style clock pendulum

Wood Stick

The wood stick will come unstained. This is so the stick can be stained the proper color to match the clock case. The wood stick pendulum consists of the stick with the hardware and also the round bob. The good thing about wood stick pendulums is they can be shortened if needed.

Types of Clock Pendulums

Brass Rod

The brass rod types of clock pendulums are mainly used on shelf clocks or wall clocks. Sometimes they are used in grand daughter or grand mother clocks, but not as common. These cost more for two reasons, there made of brass and also they are custom cut to size by us here at Clockworks. We will cut it to the exact length you need for your specific clock movement upon your ordering.

The content of this website is copyright by Clockworks and written by James Stoudenmire

Grandfather Clock Pendulum Information

The length of the pendulum on German units comes in a few CM options. German units measure the pendulum from the top of the movement to the bottom of the nut threads. The pendulum itself, the leader it hangs on, and the suspension that the leader hangs on. All three components in centimeters make up that CM length in the drop down menu.

Pendulum length information

To know how long the actual pendulum is, subtract 15CM from the options with the pendulum length. This will exclude the leader and suspension, and be the actual pendulum length from tip to tip off of the clock. This length can vary as if a larger pendulum bob is selected, the actual length of the pendulum gets longer. Why the CM length matters at all is because if the pendulum length is not near the CM length of the movement, the clock will not keep time. So the gearing in the movement and the pendulum length works together to keep time around the specified CM length.

The bob width Options

A Lyre grandfather clock pendulum comes with either a 6 1/2, 8 1/2, or 10 1/2 inch bob diameters. The 'Bob' is the round disk at the bottom of the pendulum . The CM length on the movement will indicate the length of the pendulum from the TOP of the movement all the way down to the bottom of the pendulum nut threads. This is an approximate length that depends on other factors such as bob diameter and weight of the pendulum . Basically if the CM is 94CM the pendulum itself will be about 35 inches tip to tip off of the clock, and the 114CM option would put this same measurement at approximately 44 inches.

Hermle Clock Pendulum Measuring

If a Hermle clock doesn't keep proper time, the pendulum may be incorrect. To determine if this is the problem, all of the components of the Hermle clock pendulum need to be measured. Hermle clock pendulum measuring is extremely important. Often enough the CM length stamped on the movement is not the actual pendulum length. Certainly, the CM stamp provides valuable information, however it does not state what the Hermle clock pendulum needs to be from tip to tip. This section describes what the CM stamp represents, as well as how it needs to be measured.

What the CM represents

To measure a Hermle clock pendulum, start at the very top of the movement. Continue all the way down to the bottom of the rating nut on the pendulum. The CM number will only be accurate to the pendulum length if the bob diameter is small. In other words, the larger, or the heavier, the bob is, the longer the pendulum needs to be despite the stamped length on the movement. If confused, please email [email protected] in order to determine the best pendulum length. Please provide the CM length stamped on the back plate of the movement. Also, include the width of the pendulum bob. The bob is the round disk at the bottom of the pendulum.

Parts that are measured

The pendulum length (**cm) is the distance from the suspension post all the way down. Meaning to the bottom of the pendulum nut threads. This measurement includes the pendulum from tip to tip, the leader it hangs on, and the suspension spring. This pendulum length will not always be the same as what is marked on the movement. Subsequently there are also other factors that play into this measurement. For instance, the pendulum bob diameter. The larger the pendulum bob diameter, the longer the pendulum length needs to be despite the CM length.

Conclusion

In conclusion, if the CM length on the old unit matches the CM length on the new unit it will keep proper time with the same pendulum. There are times when the old leader needs to be used on the new movement, but this is not common.

The content of this website is copyright by Clockworks and written by James Stoudenmire

The Mechanical Clock Pendulum Assembly

The mechanical clock pendulum assembly does not mean just the pendulum alone. When the word assembly is used it means the pendulum consists of three components and not just the pendulum. A pendulum assembly consists of the suspension spring way up top, the leader that hangs on it, and then the pendulum.

Pendulum styles

Usually clock pendulum makers are not movement makers and the two are married together by a person or place. A place such as Clockworks.com or Howard Miller instead of the movement manufacturer. This is interesting because it explains why there can be so many variants of pendulums available for one movement. The pendulum could be a brass rod, wood stick, or metal lyre style.

Pendulum bob diameter size

What bob diameter sizing for the clock case so it both looks good and at the same time not wack the sides of the case. A good rule for the bob diameter is it needs two inches on each side to swing. So if the clock case is 12 inches wide the bob cannot be more than 10 inches. In this example we would need a 10 inch bob but these are not made. So the choice is clear that for a 12 inch wide clock case the bob size to get is 8 1/2 inch wide at maximum. If this rule is not used and the 10 inch wide is use the clock may go tick knock tock knock as it hits the sides each swing. Eventually the clock will stop running from this resistance.

Pendulum lengths

The length of the pendulum has to be correct for the gearing inside the movement. If the pendulum is too long the clock will be too slow. If the pendulum is too short the clock is too fast. When a clock is too fast or slow it usually has nothing to do with the movement itself. It only has to do with the pendulum length alone and nothing else.

Pendulum top mount hook

The top hook has to hook up to the movements pendulum leader. The leader is the part that holds the pendulum up in the air and is hooked to the suspension spring. Sometimes an old pendulum will not hook to the new movement the same way as it did in the past but this not common. A new top hook may or may not needed for the pendulum.

Pendulum leader

The leader is the 3 to 7 inch long part that the pendulum hangs onto. Installation of the leader is done in a way that it hangs onto the suspension spring on the top of the movement. At the same time it will have the crutch on the back of the movement engaged with the center of the leader. The crutch is the wig wag part that is sticking out of the back of the movement. Leader installation is done by removing the set screw on the top of the suspension spring. With the suspension free it can be lowered to hook onto the leader and be brought back up. The leader is hooked to the suspension and the crutch on the back of the movement at the same time. This assembly gets brought back up again to mount with the set screw like it was.

The content of this website is copyright by Clockworks and written by James Stoudenmire

The mechanical clock pendulum length

A pendulum clock without a pendulum is a shame for sure. Getting the correct pendulum does take some diving into the clock world. If you have no idea what pendulum it would take, this is a basic guide. This is a basic guide to narrow it down to the best pendulum for your clock. This will cover most situations, without special equipment to figure out the length.

The movement CM or PL stamp

On the back plate of the clock movement usually, there are some numbers and or letters for identification. There maybe an indication of how long the pendulum should be in the mix of these numbers. It may say CM or PL and this stands for centimeters or pendulum length. This would be the length where it should keep approximate time. This is measured in a few different ways usually dependent on country of origin.

German made movements

Most mechanical German made clock movements are easy to figure out the pendulum length. The numbers will let us know or the clearly indicated CM or PL number will be stamped. If it is German, keep in mind the CM length is not the actual pendulum length. German units measure this length from the top of the clock movement, and this includes the three components of the pendulum all in one length, in centimeters. This length will include the pendulum itself, the leader that it hooks to, and the suspension spring on the top that the leader hooks on to, all in one CM measurement. CM stands for centimeters and PL stands for pendulum length.

If no stamp try to convert

With no pendulum length stamped into the movement some added steps are involved. The numbers on the back plate will cross reference to the pendulum length required. The first step is to identify the manufacturer of the clock movement by using the movement numbers. The movement numbers indicate who actually manufactured the movement. Various clock retailers may have have their name stamped onto it, but the numbers are always true to the manufacturer.

Converting numbers to CM length

Some movements do not have an indication of the pendulum length on the back plate. The unit will have a number that would need to be found on this website first to find out what the correct CM length is for it.

Converted number example

Let's say that the movement has no CM stamp on the movement and only shows the number UW32319. Go to the identification page to look at the movement number examples. In this example, we see that it is a Urgos. Now it is possible to go to the Urgos page and find the number to see what the pendulum length is. In this example, the pendulum length would be 80cm, representing the full length with the size of the bob factored in.

German grandfather movements

Almost all grandfather clock movements are going to be German if made after 1950. The first thing we need to do is get the numbers off of the back plate of the movement. This is the only way, and we can't cheat by looking at the paperwork or clock case. It has to come right off the back of the clockworks. The manual and the sticker on the case is of no use to get the pendulum.

American clocks

The American mechanical clock movement manufacturers referred to the pendulum length as a "drop". The drop is the length of the pendulum from the hand shaft all the way down to the bottom of the pendulum rating nut threads. It is a different way of measuring the pendulum length then the German made way. Both ways are based on the smallest bob diameter bob. If the bob is larger or heavier, the length would be longer than what is stamped.

No luck

If everything fails for one reason or another, the best chance for a pendulum is the wood stick style. This is the only style of pendulum that can be easily modified because you can chop it. These types of clocks are usually antiques, or of Asian origin, and information such as pendulum length is simply not available. Sometimes it takes a good guess on where the manufacturer intended to have the bob sit.

To do it this way, you only need a pendulum with a stick that is way too long to begin with. Chop it, try it, chop it, try it. Each time your slow, cut an inch and half off of the sticks length and hang it back on. It will only take a couple of times, and if you start way too long you can always go shorter.

Clock makers method

There is another way, its called setting the beat rate. This is a more involved way and usually just done by clock makers. It involves a beat detecting device that counts out the beats per hour, or the beats per minute. To do this, first you would need to know what the beat rate is supposed to be for that particular movement, and then keep adjusting the pendulum length until you have it keeping time. There are cell phone apps out there these days that will tell you the beat rate and the cell phone will listen and tell you if the clock will keep time with that pendulum. You go longer or shorter until your phone says the beat rate is set.

Contacting us for help

Please email the movement numbers from the back plate, and explain what part is needed. The email address to send this information is [email protected] Pictures are welcomed but not required. If emailing pictures please include the back side of the clock movement where the markings are.

The content of this website is copyright by Clockworks and written by James Stoudenmire

Timing a mechanical pendulum clock

Timing the clock is all about the overall pendulum length and rarely has anything to do with the movement itself. Mechanical clock is easy to time providing you have the correct pendulum. When the pendulum is correct for that particular movement it will hang on the leader and keep approximate time. The fine timing can be done only with the pendulum adjustment located at the very bottom. At the bottom of the bob is some adjustment threads and a nut. To turn the nut one way raises the bob and the other lowers it. A shorter pendulum will make the clock run faster. A longer pendulum makes the clock run slower.

Fine timing the clock

If the clock is timing slow, raise the pendulum bob by turning the nut at the bottom of the bob. If the clock is fast, do the same but raise the clock's pendulum bob instead. One full turn is somewhere around 1-2 minutes a day faster or slower.

If there is no more adjustment

If the bob is all the way up and its still too slow or fast, you can shorten either the pendulum or the leader it hangs on to correct.

A lyre pendulum that does not keep time with the bob all the way adjusted will need its length altered. The overall length can be altered by the pendulum itself or the leader it hangs onto. The leader is about 5 to 7 inches long and engages with the crutch on back of the movement. The leader is the part that the pendulum top hooks on to. It is possible to shorten or lengthen the pendulum leader to put the clock in time range with some solder if needed. 1 3/4 inches is a good measurement to make one of these longer or shorter as needed, as this is the length of the threads at the bottom of the bob. So it will give you a full timing adjustment range all over again and you can go up or down as needed.

German pendulum length CM stamp

The pendulum length is considered overall and not just the pendulum. For example if the clock says 94cm on the back of it, this is the way the Germans measure there pendulum lengths from the top of the movement and all the way down. This will include the suspension spring way up top, the pendulum leader or guide you can call it, and also the pendulum from tip to tip all with a 4 1/2 inch bob diameter. Of course the larger the bob, the longer it will be beyond that 94cm measurement.

Used to keep time, now does not

If the clock kept time in the past but now does not, it means a worn gear. The escape wheel is worn and it is advancing more than one tooth at a time. The escape wheel alone would be hard to find, and hard to replace both. The entire movement would be disassembled to replace this worn escape wheel if there is another one found that will work. The cost of having this done would be the same price as a new movement. There is no such thing as having a repair on a clock movement being better than a new movement. The price would be about the same for a complete overhaul or a brand new one. First see if the clock movement is in production and available new. We do this by getting the numbers off of the back plate of the movement itself, right off of the brass. The email address is [email protected] and we will check availability and quote for the new one. If the movement is not in production anymore, then a repair is the only option.

Mechanical Pendulum Clock Timing Issues - Conclusion

Fine timing of the clock is easy as you can see. If the clock kept time in the past and now too fast, its time for a new movement and has nothing to do with the pendulum. A worn escape wheel is most likely the cause and a new unit would be less cost then a repair.

The content of this website is copyright by Clockworks and written by James Stoudenmire

Hermle lyre clock pendulum

Hermle clock movement identification

Hermle lyre clock pendulum ordering

The CM number off of the Hermle clock movement itself is required to get the right pendulum. This information is not on the paper work and not on the wood case. Rather it would be a stamp on the brass clock movement's back plate instead. It will say a number such as 94CM or 114CM, some number followed by CM (centimeters).

Please note, the picture is of a Hermle Lyre pendulum for a 114cm movement with twisted rods. If the pendulum is for a 94cm or shorter movement CM it will have straight rods instead.

Sequential steps to pendulum obtainment

  • 1. Know who really made the movement. If the clock was made in Germany post WW2, it will be one of four makers. Hermle, Jauch, Kieninger, or Urgos. If none of these names are on the movement it is still, most likely made by one of these factories. They made movements for other clock makers who had their own name imprinted onto the movement because they were buying so many. Best to use the identification page to narrow down exactly who made the clock movement, then return to this page.
  • 2. Get the CM numbers, or PL numbers from the back plate of the movement itself. This will be matched up with what we are offering.
  • 3. Determine the bob diameter needed. Measure how wide the inside of the case is and then subtract 4 inches. This will be the maximum pendulum bob diameter allowed in the clock case.
  • 4. Decide between Lyre, Wood stick, or a brass rod pendulum if the options are there. They all come with a brass round bob for the end, but leading down to the bob can be any of these three styles.
  • 5. Order it
  • 6. After the pendulum is received and installed on the clock, Put The Clock In Beat.

Pendulum Measuring on a German Clock

Measure the pendulum for a German Clock from the very top of the movement down to the very bottom of the pendulum rating nut threads. If the clock says something like 94cm, choose 94cm from the list, making sure it also lists the correct bob diameter. Clockworks.com will calculate the length, making sure it is correct, before shipping it. A customer may receive the pendulum and think that it is not the correct length. Most likely, this is not the situation. Ordering a pendulum for a Hermle 94cm movement, does not mean you will get a 94cm long pendulum. The pendulum you get may be shorter, although it will be correct.

Determining Bob Diameter

Bob diameters vary so that they will not hit the sides of the case. Bob width is determined by the inside of the case width. Measure how wide the inside of the clock case is and then subtract 4 inches from that measurement. That measurement is the largest diameter bob that can be used in the clock case. A smaller diameter bob can be used, but not a larger one.

Pendulum clocks need to be put "In Beat"

After installing the new clock pendulum the clock will need an adjustment for it to run correctly. This is very easy to do and only takes a few minutes. No mechanical pendulum clock will run right without putting it "In Beat" first.

The content of this website is copyright by Clockworks and written by James Stoudenmire

Kieninger Clock Lyre Pendulum

Mechanical Clock PendulumsHow to orderPendulum TypesGerman UnitsHermle CM DescPendulum PartsLength IndicatorsTiming

Please view these information tabs to help with determining the proper Mechanical Clock Pendulums for your clock.

Sequential steps to pendulum obtainment

  • 1. Know who really made the movement. If the clock was made in Germany post WW2, it will be one of four makers. Hermle, Jauch, Kieninger, or Urgos. If none of these names are on the movement it is still, most likely made by one of these factories. They made movements for other clock makers who had their own name imprinted onto the movement because they were buying so many. Best to use the identification page to narrow down exactly who made the clock movement, then return to this page.
  • 2. Get the CM numbers, or PL numbers from the back plate of the movement itself. This will be matched up with what we are offering.
  • 3. Determine the bob diameter needed. Measure how wide the inside of the case is and then subtract 4 inches. This will be the maximum pendulum bob diameter allowed in the clock case.
  • 4. Decide between Lyre, Wood stick, or a brass rod pendulum if the options are there. They all come with a brass round bob for the end, but leading down to the bob can be any of these three styles.
  • 5. Order it
  • 6. After the pendulum is received and installed on the clock, Put The Clock In Beat.

Pendulum Measuring on a German Clock

Measure the pendulum for a German Clock from the very top of the movement down to the very bottom of the pendulum rating nut threads. If the clock says something like 94cm, choose 94cm from the list, making sure it also lists the correct bob diameter. Clockworks.com will calculate the length, making sure it is correct, before shipping it. A customer may receive the pendulum and think that it is not the correct length. Most likely, this is not the situation. Ordering a pendulum for a Hermle 94cm movement, does not mean you will get a 94cm long pendulum. The pendulum you get may be shorter, although it will be correct.

Determining Bob Diameter

Bob diameters vary so that they will not hit the sides of the case. Bob width is determined by the inside of the case width. Measure how wide the inside of the clock case is and then subtract 4 inches from that measurement. That measurement is the largest diameter bob that can be used in the clock case. A smaller diameter bob can be used, but not a larger one.

Pendulum clocks need to be put "In Beat"

After installing the new clock pendulum the clock will need an adjustment for it to run correctly. This is very easy to do and only takes a few minutes. No mechanical pendulum clock will run right without putting it "In Beat" first.

The content of this website is copyright by Clockworks and written by James Stoudenmire

Types of Clock Pendulums

After knowing who made the clock, it is time to decide what pendulum style is best. Clock pendulums can be divided into three basic categories. Very short mantle clock pendulums will use a mantle bob and these are not discussed in this section. If you have a short mantle clock please search for a mantle bob instead. What is covered here are the types of clock pendulums available for shelf, wall and floor clocks.

  • The brass rod style pendulum for small shelf or wall clocks.
  • Metal Lyre style pendulums for floor clocks.
  • Wood stick pendulums that are used on everything.
Types of Clock Pendulums

Metal Lyre

A metal Lyre style pendulum are used for floor clocks. A floor clock can mean a grandfather, grandmother, or granddaughter clock. We offer these for German post WW2 units such as Urgos, Kieninger, Jauch and Hermle units. These are the only post WW2 German units made, despite the fact it may something other than these names. The names may vary on the back plate because companies would pay to have there name on the movement instead.

Wood stick style clock pendulum

Wood Stick

The wood stick will come unstained. This is so the stick can be stained the proper color to match the clock case. The wood stick pendulum consists of the stick with the hardware and also the round bob. The good thing about wood stick pendulums is they can be shortened if needed.

Types of Clock Pendulums

Brass Rod

The brass rod types of clock pendulums are mainly used on shelf clocks or wall clocks. Sometimes they are used in grand daughter or grand mother clocks, but not as common. These cost more for two reasons, there made of brass and also they are custom cut to size by us here at Clockworks. We will cut it to the exact length you need for your specific clock movement upon your ordering.

The content of this website is copyright by Clockworks and written by James Stoudenmire

Grandfather Clock Pendulum Information

The length of the pendulum on German units comes in a few CM options. German units measure the pendulum from the top of the movement to the bottom of the nut threads. The pendulum itself, the leader it hangs on, and the suspension that the leader hangs on. All three components in centimeters make up that CM length in the drop down menu.

Pendulum length information

To know how long the actual pendulum is, subtract 15CM from the options with the pendulum length. This will exclude the leader and suspension, and be the actual pendulum length from tip to tip off of the clock. This length can vary as if a larger pendulum bob is selected, the actual length of the pendulum gets longer. Why the CM length matters at all is because if the pendulum length is not near the CM length of the movement, the clock will not keep time. So the gearing in the movement and the pendulum length works together to keep time around the specified CM length.

The bob width Options

A Lyre grandfather clock pendulum comes with either a 6 1/2, 8 1/2, or 10 1/2 inch bob diameters. The 'Bob' is the round disk at the bottom of the pendulum . The CM length on the movement will indicate the length of the pendulum from the TOP of the movement all the way down to the bottom of the pendulum nut threads. This is an approximate length that depends on other factors such as bob diameter and weight of the pendulum . Basically if the CM is 94CM the pendulum itself will be about 35 inches tip to tip off of the clock, and the 114CM option would put this same measurement at approximately 44 inches.

Hermle Clock Pendulum Measuring

If a Hermle clock doesn't keep proper time, the pendulum may be incorrect. To determine if this is the problem, all of the components of the Hermle clock pendulum need to be measured. Hermle clock pendulum measuring is extremely important. Often enough the CM length stamped on the movement is not the actual pendulum length. Certainly, the CM stamp provides valuable information, however it does not state what the Hermle clock pendulum needs to be from tip to tip. This section describes what the CM stamp represents, as well as how it needs to be measured.

What the CM represents

To measure a Hermle clock pendulum, start at the very top of the movement. Continue all the way down to the bottom of the rating nut on the pendulum. The CM number will only be accurate to the pendulum length if the bob diameter is small. In other words, the larger, or the heavier, the bob is, the longer the pendulum needs to be despite the stamped length on the movement. If confused, please email [email protected] in order to determine the best pendulum length. Please provide the CM length stamped on the back plate of the movement. Also, include the width of the pendulum bob. The bob is the round disk at the bottom of the pendulum.

Parts that are measured

The pendulum length (**cm) is the distance from the suspension post all the way down. Meaning to the bottom of the pendulum nut threads. This measurement includes the pendulum from tip to tip, the leader it hangs on, and the suspension spring. This pendulum length will not always be the same as what is marked on the movement. Subsequently there are also other factors that play into this measurement. For instance, the pendulum bob diameter. The larger the pendulum bob diameter, the longer the pendulum length needs to be despite the CM length.

Conclusion

In conclusion, if the CM length on the old unit matches the CM length on the new unit it will keep proper time with the same pendulum. There are times when the old leader needs to be used on the new movement, but this is not common.

The content of this website is copyright by Clockworks and written by James Stoudenmire

The Mechanical Clock Pendulum Assembly

The mechanical clock pendulum assembly does not mean just the pendulum alone. When the word assembly is used it means the pendulum consists of three components and not just the pendulum. A pendulum assembly consists of the suspension spring way up top, the leader that hangs on it, and then the pendulum.

Pendulum styles

Usually clock pendulum makers are not movement makers and the two are married together by a person or place. A place such as Clockworks.com or Howard Miller instead of the movement manufacturer. This is interesting because it explains why there can be so many variants of pendulums available for one movement. The pendulum could be a brass rod, wood stick, or metal lyre style.

Pendulum bob diameter size

What bob diameter sizing for the clock case so it both looks good and at the same time not wack the sides of the case. A good rule for the bob diameter is it needs two inches on each side to swing. So if the clock case is 12 inches wide the bob cannot be more than 10 inches. In this example we would need a 10 inch bob but these are not made. So the choice is clear that for a 12 inch wide clock case the bob size to get is 8 1/2 inch wide at maximum. If this rule is not used and the 10 inch wide is use the clock may go tick knock tock knock as it hits the sides each swing. Eventually the clock will stop running from this resistance.

Pendulum lengths

The length of the pendulum has to be correct for the gearing inside the movement. If the pendulum is too long the clock will be too slow. If the pendulum is too short the clock is too fast. When a clock is too fast or slow it usually has nothing to do with the movement itself. It only has to do with the pendulum length alone and nothing else.

Pendulum top mount hook

The top hook has to hook up to the movements pendulum leader. The leader is the part that holds the pendulum up in the air and is hooked to the suspension spring. Sometimes an old pendulum will not hook to the new movement the same way as it did in the past but this not common. A new top hook may or may not needed for the pendulum.

Pendulum leader

The leader is the 3 to 7 inch long part that the pendulum hangs onto. Installation of the leader is done in a way that it hangs onto the suspension spring on the top of the movement. At the same time it will have the crutch on the back of the movement engaged with the center of the leader. The crutch is the wig wag part that is sticking out of the back of the movement. Leader installation is done by removing the set screw on the top of the suspension spring. With the suspension free it can be lowered to hook onto the leader and be brought back up. The leader is hooked to the suspension and the crutch on the back of the movement at the same time. This assembly gets brought back up again to mount with the set screw like it was.

The content of this website is copyright by Clockworks and written by James Stoudenmire

The mechanical clock pendulum length

A pendulum clock without a pendulum is a shame for sure. Getting the correct pendulum does take some diving into the clock world. If you have no idea what pendulum it would take, this is a basic guide. This is a basic guide to narrow it down to the best pendulum for your clock. This will cover most situations, without special equipment to figure out the length.

The movement CM or PL stamp

On the back plate of the clock movement usually, there are some numbers and or letters for identification. There maybe an indication of how long the pendulum should be in the mix of these numbers. It may say CM or PL and this stands for centimeters or pendulum length. This would be the length where it should keep approximate time. This is measured in a few different ways usually dependent on country of origin.

German made movements

Most mechanical German made clock movements are easy to figure out the pendulum length. The numbers will let us know or the clearly indicated CM or PL number will be stamped. If it is German, keep in mind the CM length is not the actual pendulum length. German units measure this length from the top of the clock movement, and this includes the three components of the pendulum all in one length, in centimeters. This length will include the pendulum itself, the leader that it hooks to, and the suspension spring on the top that the leader hooks on to, all in one CM measurement. CM stands for centimeters and PL stands for pendulum length.

If no stamp try to convert

With no pendulum length stamped into the movement some added steps are involved. The numbers on the back plate will cross reference to the pendulum length required. The first step is to identify the manufacturer of the clock movement by using the movement numbers. The movement numbers indicate who actually manufactured the movement. Various clock retailers may have have their name stamped onto it, but the numbers are always true to the manufacturer.

Converting numbers to CM length

Some movements do not have an indication of the pendulum length on the back plate. The unit will have a number that would need to be found on this website first to find out what the correct CM length is for it.

Converted number example

Let's say that the movement has no CM stamp on the movement and only shows the number UW32319. Go to the identification page to look at the movement number examples. In this example, we see that it is a Urgos. Now it is possible to go to the Urgos page and find the number to see what the pendulum length is. In this example, the pendulum length would be 80cm, representing the full length with the size of the bob factored in.

German grandfather movements

Almost all grandfather clock movements are going to be German if made after 1950. The first thing we need to do is get the numbers off of the back plate of the movement. This is the only way, and we can't cheat by looking at the paperwork or clock case. It has to come right off the back of the clockworks. The manual and the sticker on the case is of no use to get the pendulum.

American clocks

The American mechanical clock movement manufacturers referred to the pendulum length as a "drop". The drop is the length of the pendulum from the hand shaft all the way down to the bottom of the pendulum rating nut threads. It is a different way of measuring the pendulum length then the German made way. Both ways are based on the smallest bob diameter bob. If the bob is larger or heavier, the length would be longer than what is stamped.

No luck

If everything fails for one reason or another, the best chance for a pendulum is the wood stick style. This is the only style of pendulum that can be easily modified because you can chop it. These types of clocks are usually antiques, or of Asian origin, and information such as pendulum length is simply not available. Sometimes it takes a good guess on where the manufacturer intended to have the bob sit.

To do it this way, you only need a pendulum with a stick that is way too long to begin with. Chop it, try it, chop it, try it. Each time your slow, cut an inch and half off of the sticks length and hang it back on. It will only take a couple of times, and if you start way too long you can always go shorter.

Clock makers method

There is another way, its called setting the beat rate. This is a more involved way and usually just done by clock makers. It involves a beat detecting device that counts out the beats per hour, or the beats per minute. To do this, first you would need to know what the beat rate is supposed to be for that particular movement, and then keep adjusting the pendulum length until you have it keeping time. There are cell phone apps out there these days that will tell you the beat rate and the cell phone will listen and tell you if the clock will keep time with that pendulum. You go longer or shorter until your phone says the beat rate is set.

Contacting us for help

Please email the movement numbers from the back plate, and explain what part is needed. The email address to send this information is [email protected] Pictures are welcomed but not required. If emailing pictures please include the back side of the clock movement where the markings are.

The content of this website is copyright by Clockworks and written by James Stoudenmire

Timing a mechanical pendulum clock

Timing the clock is all about the overall pendulum length and rarely has anything to do with the movement itself. Mechanical clock is easy to time providing you have the correct pendulum. When the pendulum is correct for that particular movement it will hang on the leader and keep approximate time. The fine timing can be done only with the pendulum adjustment located at the very bottom. At the bottom of the bob is some adjustment threads and a nut. To turn the nut one way raises the bob and the other lowers it. A shorter pendulum will make the clock run faster. A longer pendulum makes the clock run slower.

Fine timing the clock

If the clock is timing slow, raise the pendulum bob by turning the nut at the bottom of the bob. If the clock is fast, do the same but raise the clock's pendulum bob instead. One full turn is somewhere around 1-2 minutes a day faster or slower.

If there is no more adjustment

If the bob is all the way up and its still too slow or fast, you can shorten either the pendulum or the leader it hangs on to correct.

A lyre pendulum that does not keep time with the bob all the way adjusted will need its length altered. The overall length can be altered by the pendulum itself or the leader it hangs onto. The leader is about 5 to 7 inches long and engages with the crutch on back of the movement. The leader is the part that the pendulum top hooks on to. It is possible to shorten or lengthen the pendulum leader to put the clock in time range with some solder if needed. 1 3/4 inches is a good measurement to make one of these longer or shorter as needed, as this is the length of the threads at the bottom of the bob. So it will give you a full timing adjustment range all over again and you can go up or down as needed.

German pendulum length CM stamp

The pendulum length is considered overall and not just the pendulum. For example if the clock says 94cm on the back of it, this is the way the Germans measure there pendulum lengths from the top of the movement and all the way down. This will include the suspension spring way up top, the pendulum leader or guide you can call it, and also the pendulum from tip to tip all with a 4 1/2 inch bob diameter. Of course the larger the bob, the longer it will be beyond that 94cm measurement.

Used to keep time, now does not

If the clock kept time in the past but now does not, it means a worn gear. The escape wheel is worn and it is advancing more than one tooth at a time. The escape wheel alone would be hard to find, and hard to replace both. The entire movement would be disassembled to replace this worn escape wheel if there is another one found that will work. The cost of having this done would be the same price as a new movement. There is no such thing as having a repair on a clock movement being better than a new movement. The price would be about the same for a complete overhaul or a brand new one. First see if the clock movement is in production and available new. We do this by getting the numbers off of the back plate of the movement itself, right off of the brass. The email address is [email protected] and we will check availability and quote for the new one. If the movement is not in production anymore, then a repair is the only option.

Mechanical Pendulum Clock Timing Issues - Conclusion

Fine timing of the clock is easy as you can see. If the clock kept time in the past and now too fast, its time for a new movement and has nothing to do with the pendulum. A worn escape wheel is most likely the cause and a new unit would be less cost then a repair.

The content of this website is copyright by Clockworks and written by James Stoudenmire

Kieninger Clock Lyre Pendulum

The CM number off of the Kieninger clock movement itself is required to get the right pendulum. This information is not on the paper work and not on the wood case. Rather it would be a stamp on the brass clock movement's back plate instead. It will say a number such as 93CM or 116CM, some number followed by CM (centimeters).

Lyre Pendulum Description

Please note, the picture is of a Kieninger Lyre pendulum for a 116cm movement with twisted rods. If the pendulum is for a 93cm or shorter movement CM it will have straight rods instead.

Sequential steps to pendulum obtainment

  • 1. Know who really made the movement. If the clock was made in Germany post WW2, it will be one of four makers. Hermle, Jauch, Kieninger, or Urgos. If none of these names are on the movement it is still, most likely made by one of these factories. They made movements for other clock makers who had their own name imprinted onto the movement because they were buying so many. Best to use the identification page to narrow down exactly who made the clock movement, then return to this page.
  • 2. Get the CM numbers, or PL numbers from the back plate of the movement itself. This will be matched up with what we are offering.
  • 3. Determine the bob diameter needed. Measure how wide the inside of the case is and then subtract 4 inches. This will be the maximum pendulum bob diameter allowed in the clock case.
  • 4. Decide between Lyre, Wood stick, or a brass rod pendulum if the options are there. They all come with a brass round bob for the end, but leading down to the bob can be any of these three styles.
  • 5. Order it
  • 6. After the pendulum is received and installed on the clock, Put The Clock In Beat.

Pendulum Measuring on a German Clock

Measure the pendulum for a German Clock from the very top of the movement down to the very bottom of the pendulum rating nut threads. If the clock says something like 94cm, choose 94cm from the list, making sure it also lists the correct bob diameter. Clockworks.com will calculate the length, making sure it is correct, before shipping it. A customer may receive the pendulum and think that it is not the correct length. Most likely, this is not the situation. Ordering a pendulum for a Hermle 94cm movement, does not mean you will get a 94cm long pendulum. The pendulum you get may be shorter, although it will be correct.

Determining Bob Diameter

Bob diameters vary so that they will not hit the sides of the case. Bob width is determined by the inside of the case width. Measure how wide the inside of the clock case is and then subtract 4 inches from that measurement. That measurement is the largest diameter bob that can be used in the clock case. A smaller diameter bob can be used, but not a larger one.

Pendulum clocks need to be put "In Beat"

After installing the new clock pendulum the clock will need an adjustment for it to run correctly. This is very easy to do and only takes a few minutes. No mechanical pendulum clock will run right without putting it "In Beat" first.

The content of this website is copyright by Clockworks and written by James Stoudenmire

Kieninger clock movement identification

The first step to replace the movement or any components is to first do the identification process on the Kieninger clock movement. To get the new clock movement price and what it includes, we start with the numbers. The numbers are also required to get components of the clock also. Components include pendulums, dials, hands, keys, cranks, chime blocks, mounting screws, weights, pulleys or chains.

Decoding Kieninger clock movements

For example lets say the movement numbers are 81 K 116cm.

  • 1981 =The first numbers 81 is the year made if it is an on older unit. On the new units this number is not the year but only an internal engineering code.
  • K = The K is the movements series. This is the basic raw movement plate size and internal gear configuration.
  • 116CM = The pendulum length in centimeters measured from the top of the movement all the down. Based on the smallest 4 1/2 inch bob diameter.

Kieninger Clock Movement Identification

Dating the Kieninger movement

Above is stated 81 was the date, however this has changed in the later years. After a certain date that first number is no longer the date produced. So it may or may not be the date, but you can just ignore that first number when replacing the unit. There is no longer a solid way to date the Kieninger clock movement unless it is stamped on the plate.

We can help

The new movement will fit into the clock case just as the old one did. Keep using the same components such as the dial, pendulum, chime block and weights. If it is a weight driven clock it will come with the chains or cables with pulleys. If this decoding process is confusing, just email the numbers or a picture to [email protected] Kieninger clock movement questions and ordering can be done by phone also 800-381-7458.

The content of this website is copyright by Clockworks and written by James Stoudenmire

Urgos Lyre Clock Pendulum

Mechanical Clock PendulumsHow to orderPendulum TypesGerman UnitsHermle CM DescPendulum PartsLength IndicatorsTiming

Please view these information tabs to help with determining the proper Mechanical Clock Pendulums for your clock.

Sequential steps to pendulum obtainment

  • 1. Know who really made the movement. If the clock was made in Germany post WW2, it will be one of four makers. Hermle, Jauch, Kieninger, or Urgos. If none of these names are on the movement it is still, most likely made by one of these factories. They made movements for other clock makers who had their own name imprinted onto the movement because they were buying so many. Best to use the identification page to narrow down exactly who made the clock movement, then return to this page.
  • 2. Get the CM numbers, or PL numbers from the back plate of the movement itself. This will be matched up with what we are offering.
  • 3. Determine the bob diameter needed. Measure how wide the inside of the case is and then subtract 4 inches. This will be the maximum pendulum bob diameter allowed in the clock case.
  • 4. Decide between Lyre, Wood stick, or a brass rod pendulum if the options are there. They all come with a brass round bob for the end, but leading down to the bob can be any of these three styles.
  • 5. Order it
  • 6. After the pendulum is received and installed on the clock, Put The Clock In Beat.

Pendulum Measuring on a German Clock

Measure the pendulum for a German Clock from the very top of the movement down to the very bottom of the pendulum rating nut threads. If the clock says something like 94cm, choose 94cm from the list, making sure it also lists the correct bob diameter. Clockworks.com will calculate the length, making sure it is correct, before shipping it. A customer may receive the pendulum and think that it is not the correct length. Most likely, this is not the situation. Ordering a pendulum for a Hermle 94cm movement, does not mean you will get a 94cm long pendulum. The pendulum you get may be shorter, although it will be correct.

Determining Bob Diameter

Bob diameters vary so that they will not hit the sides of the case. Bob width is determined by the inside of the case width. Measure how wide the inside of the clock case is and then subtract 4 inches from that measurement. That measurement is the largest diameter bob that can be used in the clock case. A smaller diameter bob can be used, but not a larger one.

Pendulum clocks need to be put "In Beat"

After installing the new clock pendulum the clock will need an adjustment for it to run correctly. This is very easy to do and only takes a few minutes. No mechanical pendulum clock will run right without putting it "In Beat" first.

The content of this website is copyright by Clockworks and written by James Stoudenmire

Types of Clock Pendulums

After knowing who made the clock, it is time to decide what pendulum style is best. Clock pendulums can be divided into three basic categories. Very short mantle clock pendulums will use a mantle bob and these are not discussed in this section. If you have a short mantle clock please search for a mantle bob instead. What is covered here are the types of clock pendulums available for shelf, wall and floor clocks.

  • The brass rod style pendulum for small shelf or wall clocks.
  • Metal Lyre style pendulums for floor clocks.
  • Wood stick pendulums that are used on everything.
Types of Clock Pendulums

Metal Lyre

A metal Lyre style pendulum are used for floor clocks. A floor clock can mean a grandfather, grandmother, or granddaughter clock. We offer these for German post WW2 units such as Urgos, Kieninger, Jauch and Hermle units. These are the only post WW2 German units made, despite the fact it may something other than these names. The names may vary on the back plate because companies would pay to have there name on the movement instead.

Wood stick style clock pendulum

Wood Stick

The wood stick will come unstained. This is so the stick can be stained the proper color to match the clock case. The wood stick pendulum consists of the stick with the hardware and also the round bob. The good thing about wood stick pendulums is they can be shortened if needed.

Types of Clock Pendulums

Brass Rod

The brass rod types of clock pendulums are mainly used on shelf clocks or wall clocks. Sometimes they are used in grand daughter or grand mother clocks, but not as common. These cost more for two reasons, there made of brass and also they are custom cut to size by us here at Clockworks. We will cut it to the exact length you need for your specific clock movement upon your ordering.

The content of this website is copyright by Clockworks and written by James Stoudenmire

Grandfather Clock Pendulum Information

The length of the pendulum on German units comes in a few CM options. German units measure the pendulum from the top of the movement to the bottom of the nut threads. The pendulum itself, the leader it hangs on, and the suspension that the leader hangs on. All three components in centimeters make up that CM length in the drop down menu.

Pendulum length information

To know how long the actual pendulum is, subtract 15CM from the options with the pendulum length. This will exclude the leader and suspension, and be the actual pendulum length from tip to tip off of the clock. This length can vary as if a larger pendulum bob is selected, the actual length of the pendulum gets longer. Why the CM length matters at all is because if the pendulum length is not near the CM length of the movement, the clock will not keep time. So the gearing in the movement and the pendulum length works together to keep time around the specified CM length.

The bob width Options

A Lyre grandfather clock pendulum comes with either a 6 1/2, 8 1/2, or 10 1/2 inch bob diameters. The 'Bob' is the round disk at the bottom of the pendulum . The CM length on the movement will indicate the length of the pendulum from the TOP of the movement all the way down to the bottom of the pendulum nut threads. This is an approximate length that depends on other factors such as bob diameter and weight of the pendulum . Basically if the CM is 94CM the pendulum itself will be about 35 inches tip to tip off of the clock, and the 114CM option would put this same measurement at approximately 44 inches.

Hermle Clock Pendulum Measuring

If a Hermle clock doesn't keep proper time, the pendulum may be incorrect. To determine if this is the problem, all of the components of the Hermle clock pendulum need to be measured. Hermle clock pendulum measuring is extremely important. Often enough the CM length stamped on the movement is not the actual pendulum length. Certainly, the CM stamp provides valuable information, however it does not state what the Hermle clock pendulum needs to be from tip to tip. This section describes what the CM stamp represents, as well as how it needs to be measured.

What the CM represents

To measure a Hermle clock pendulum, start at the very top of the movement. Continue all the way down to the bottom of the rating nut on the pendulum. The CM number will only be accurate to the pendulum length if the bob diameter is small. In other words, the larger, or the heavier, the bob is, the longer the pendulum needs to be despite the stamped length on the movement. If confused, please email [email protected] in order to determine the best pendulum length. Please provide the CM length stamped on the back plate of the movement. Also, include the width of the pendulum bob. The bob is the round disk at the bottom of the pendulum.

Parts that are measured

The pendulum length (**cm) is the distance from the suspension post all the way down. Meaning to the bottom of the pendulum nut threads. This measurement includes the pendulum from tip to tip, the leader it hangs on, and the suspension spring. This pendulum length will not always be the same as what is marked on the movement. Subsequently there are also other factors that play into this measurement. For instance, the pendulum bob diameter. The larger the pendulum bob diameter, the longer the pendulum length needs to be despite the CM length.

Conclusion

In conclusion, if the CM length on the old unit matches the CM length on the new unit it will keep proper time with the same pendulum. There are times when the old leader needs to be used on the new movement, but this is not common.

The content of this website is copyright by Clockworks and written by James Stoudenmire

The Mechanical Clock Pendulum Assembly

The mechanical clock pendulum assembly does not mean just the pendulum alone. When the word assembly is used it means the pendulum consists of three components and not just the pendulum. A pendulum assembly consists of the suspension spring way up top, the leader that hangs on it, and then the pendulum.

Pendulum styles

Usually clock pendulum makers are not movement makers and the two are married together by a person or place. A place such as Clockworks.com or Howard Miller instead of the movement manufacturer. This is interesting because it explains why there can be so many variants of pendulums available for one movement. The pendulum could be a brass rod, wood stick, or metal lyre style.

Pendulum bob diameter size

What bob diameter sizing for the clock case so it both looks good and at the same time not wack the sides of the case. A good rule for the bob diameter is it needs two inches on each side to swing. So if the clock case is 12 inches wide the bob cannot be more than 10 inches. In this example we would need a 10 inch bob but these are not made. So the choice is clear that for a 12 inch wide clock case the bob size to get is 8 1/2 inch wide at maximum. If this rule is not used and the 10 inch wide is use the clock may go tick knock tock knock as it hits the sides each swing. Eventually the clock will stop running from this resistance.

Pendulum lengths

The length of the pendulum has to be correct for the gearing inside the movement. If the pendulum is too long the clock will be too slow. If the pendulum is too short the clock is too fast. When a clock is too fast or slow it usually has nothing to do with the movement itself. It only has to do with the pendulum length alone and nothing else.

Pendulum top mount hook

The top hook has to hook up to the movements pendulum leader. The leader is the part that holds the pendulum up in the air and is hooked to the suspension spring. Sometimes an old pendulum will not hook to the new movement the same way as it did in the past but this not common. A new top hook may or may not needed for the pendulum.

Pendulum leader

The leader is the 3 to 7 inch long part that the pendulum hangs onto. Installation of the leader is done in a way that it hangs onto the suspension spring on the top of the movement. At the same time it will have the crutch on the back of the movement engaged with the center of the leader. The crutch is the wig wag part that is sticking out of the back of the movement. Leader installation is done by removing the set screw on the top of the suspension spring. With the suspension free it can be lowered to hook onto the leader and be brought back up. The leader is hooked to the suspension and the crutch on the back of the movement at the same time. This assembly gets brought back up again to mount with the set screw like it was.

The content of this website is copyright by Clockworks and written by James Stoudenmire

The mechanical clock pendulum length

A pendulum clock without a pendulum is a shame for sure. Getting the correct pendulum does take some diving into the clock world. If you have no idea what pendulum it would take, this is a basic guide. This is a basic guide to narrow it down to the best pendulum for your clock. This will cover most situations, without special equipment to figure out the length.

The movement CM or PL stamp

On the back plate of the clock movement usually, there are some numbers and or letters for identification. There maybe an indication of how long the pendulum should be in the mix of these numbers. It may say CM or PL and this stands for centimeters or pendulum length. This would be the length where it should keep approximate time. This is measured in a few different ways usually dependent on country of origin.

German made movements

Most mechanical German made clock movements are easy to figure out the pendulum length. The numbers will let us know or the clearly indicated CM or PL number will be stamped. If it is German, keep in mind the CM length is not the actual pendulum length. German units measure this length from the top of the clock movement, and this includes the three components of the pendulum all in one length, in centimeters. This length will include the pendulum itself, the leader that it hooks to, and the suspension spring on the top that the leader hooks on to, all in one CM measurement. CM stands for centimeters and PL stands for pendulum length.

If no stamp try to convert

With no pendulum length stamped into the movement some added steps are involved. The numbers on the back plate will cross reference to the pendulum length required. The first step is to identify the manufacturer of the clock movement by using the movement numbers. The movement numbers indicate who actually manufactured the movement. Various clock retailers may have have their name stamped onto it, but the numbers are always true to the manufacturer.

Converting numbers to CM length

Some movements do not have an indication of the pendulum length on the back plate. The unit will have a number that would need to be found on this website first to find out what the correct CM length is for it.

Converted number example

Let's say that the movement has no CM stamp on the movement and only shows the number UW32319. Go to the identification page to look at the movement number examples. In this example, we see that it is a Urgos. Now it is possible to go to the Urgos page and find the number to see what the pendulum length is. In this example, the pendulum length would be 80cm, representing the full length with the size of the bob factored in.

German grandfather movements

Almost all grandfather clock movements are going to be German if made after 1950. The first thing we need to do is get the numbers off of the back plate of the movement. This is the only way, and we can't cheat by looking at the paperwork or clock case. It has to come right off the back of the clockworks. The manual and the sticker on the case is of no use to get the pendulum.

American clocks

The American mechanical clock movement manufacturers referred to the pendulum length as a "drop". The drop is the length of the pendulum from the hand shaft all the way down to the bottom of the pendulum rating nut threads. It is a different way of measuring the pendulum length then the German made way. Both ways are based on the smallest bob diameter bob. If the bob is larger or heavier, the length would be longer than what is stamped.

No luck

If everything fails for one reason or another, the best chance for a pendulum is the wood stick style. This is the only style of pendulum that can be easily modified because you can chop it. These types of clocks are usually antiques, or of Asian origin, and information such as pendulum length is simply not available. Sometimes it takes a good guess on where the manufacturer intended to have the bob sit.

To do it this way, you only need a pendulum with a stick that is way too long to begin with. Chop it, try it, chop it, try it. Each time your slow, cut an inch and half off of the sticks length and hang it back on. It will only take a couple of times, and if you start way too long you can always go shorter.

Clock makers method

There is another way, its called setting the beat rate. This is a more involved way and usually just done by clock makers. It involves a beat detecting device that counts out the beats per hour, or the beats per minute. To do this, first you would need to know what the beat rate is supposed to be for that particular movement, and then keep adjusting the pendulum length until you have it keeping time. There are cell phone apps out there these days that will tell you the beat rate and the cell phone will listen and tell you if the clock will keep time with that pendulum. You go longer or shorter until your phone says the beat rate is set.

Contacting us for help

Please email the movement numbers from the back plate, and explain what part is needed. The email address to send this information is [email protected] Pictures are welcomed but not required. If emailing pictures please include the back side of the clock movement where the markings are.

The content of this website is copyright by Clockworks and written by James Stoudenmire

Timing a mechanical pendulum clock

Timing the clock is all about the overall pendulum length and rarely has anything to do with the movement itself. Mechanical clock is easy to time providing you have the correct pendulum. When the pendulum is correct for that particular movement it will hang on the leader and keep approximate time. The fine timing can be done only with the pendulum adjustment located at the very bottom. At the bottom of the bob is some adjustment threads and a nut. To turn the nut one way raises the bob and the other lowers it. A shorter pendulum will make the clock run faster. A longer pendulum makes the clock run slower.

Fine timing the clock

If the clock is timing slow, raise the pendulum bob by turning the nut at the bottom of the bob. If the clock is fast, do the same but raise the clock's pendulum bob instead. One full turn is somewhere around 1-2 minutes a day faster or slower.

If there is no more adjustment

If the bob is all the way up and its still too slow or fast, you can shorten either the pendulum or the leader it hangs on to correct.

A lyre pendulum that does not keep time with the bob all the way adjusted will need its length altered. The overall length can be altered by the pendulum itself or the leader it hangs onto. The leader is about 5 to 7 inches long and engages with the crutch on back of the movement. The leader is the part that the pendulum top hooks on to. It is possible to shorten or lengthen the pendulum leader to put the clock in time range with some solder if needed. 1 3/4 inches is a good measurement to make one of these longer or shorter as needed, as this is the length of the threads at the bottom of the bob. So it will give you a full timing adjustment range all over again and you can go up or down as needed.

German pendulum length CM stamp

The pendulum length is considered overall and not just the pendulum. For example if the clock says 94cm on the back of it, this is the way the Germans measure there pendulum lengths from the top of the movement and all the way down. This will include the suspension spring way up top, the pendulum leader or guide you can call it, and also the pendulum from tip to tip all with a 4 1/2 inch bob diameter. Of course the larger the bob, the longer it will be beyond that 94cm measurement.

Used to keep time, now does not

If the clock kept time in the past but now does not, it means a worn gear. The escape wheel is worn and it is advancing more than one tooth at a time. The escape wheel alone would be hard to find, and hard to replace both. The entire movement would be disassembled to replace this worn escape wheel if there is another one found that will work. The cost of having this done would be the same price as a new movement. There is no such thing as having a repair on a clock movement being better than a new movement. The price would be about the same for a complete overhaul or a brand new one. First see if the clock movement is in production and available new. We do this by getting the numbers off of the back plate of the movement itself, right off of the brass. The email address is [email protected] and we will check availability and quote for the new one. If the movement is not in production anymore, then a repair is the only option.

Mechanical Pendulum Clock Timing Issues - Conclusion

Fine timing of the clock is easy as you can see. If the clock kept time in the past and now too fast, its time for a new movement and has nothing to do with the pendulum. A worn escape wheel is most likely the cause and a new unit would be less cost then a repair.

The content of this website is copyright by Clockworks and written by James Stoudenmire

Urgos lyre clock pendulums are custom fit

Urgos Lyre pendulums are obsolete and no longer available new. We have for sale here a modified Hermle Lyre pendulum that will fit and function on a Urgos movement instead. Clockworks.com will adjust the length and swap the top of the pendulum to fit the UW-Urgos clock movement.

Pendulum lengths

The CM length on the drop down options are not how long the pendulum will be. Rather what is offered is a pendulum for an Urgos movement with that CM stamped on the back of it. Example: UW32/1 is an 80cm movement, but when the pendulum arrives it is only 27 inches long (68cm). Urgos measures from the top of the movement and down instead of just the pendulum.

UW-Urgos Identification

Urgos clock movement identification

UW-Urgos lyre clock pendulum ordering

This movement series can be tricky to determine how long the pendulum is supposed to be. This is because they did not often stamp the CM number on the back plate of the movement. Instead we need to look it up by the number. Such as if it says UW32319 the chart will tell us that is an 80cm movement. This does not mean the pendulum itself will come 80cm as noted below. If the movement has an old number, it must first be converted to the new number, and that new number will give us the CM length. Wow, huh? If this is too much just email the numbers and we will tell you what pendulum you will need. To go at it on your own, here is the chart to figure out the CM length is needed. It can be found at this link and then come back here to continue ordering the pendulum.

Pendulum ordering requires the CM number

The CM number off of the Urgos clock movement itself is required to get the right pendulum. This information is not on the paper work and not on the wood case. Rather it would be a stamp on the brass clock movement's back plate instead. It will say a number such as 93CM or 116CM, some number followed by CM (centimeters) if it is there.

UW-Urgos lyre clock pendulum description

Please note, the picture is of a Urgos Lyre pendulum for a 116cm movement with twisted rods. If the pendulum is for a 100cm or shorter movement CM it will have straight rods instead.

Urgos Lyre Pendulum Availability

Urgos Lyre Pendulum Availability is none at all actually. They have not been made in over 30 years, in fact none of the outer component have been. However there is still a solution and we can provide the lyre pendulum that is custom fit.

Custom pendulum work

We can customize a new Lyre pendulum for the UW Urgos clock movement here at clockworks. What we do is take a Hermle Lyre pendulum that is still in production, and solder a new top hook to the pendulum. We make the pendulum length special for your specific clock. This solder or riveted on top hook, maybe noticeable but when hanging on the clock no one will see it.

Urgos custom lyre timing

Please understand that we will do our best to create the pendulum length perfect. There is a chance that the pendulum would need to be shortened or made longer beyond the adjustment of the threads. There are times the pendulum length misses its mark. We would need the leader if this happens to make it longer or shorter. The leader is the short bar the pendulum hangs on, that is about 5 inches long.

Upon ordering the pendulum

When ordering the custom lyre pendulum, you will get an email asking for the movement numbers. There are two styles of pendulum mounting top hooks. We would need to know only if the movement starts with UW32 or UW03 in the numbers.

The content of this website is copyright by Clockworks and written by James Stoudenmire

UW-Urgos Stick Clock Pendulum

Mechanical Clock PendulumsHow to orderPendulum TypesGerman UnitsHermle CM DescPendulum PartsLength IndicatorsTiming

Please view these information tabs to help with determining the proper Mechanical Clock Pendulums for your clock.

Sequential steps to pendulum obtainment

  • 1. Know who really made the movement. If the clock was made in Germany post WW2, it will be one of four makers. Hermle, Jauch, Kieninger, or Urgos. If none of these names are on the movement it is still, most likely made by one of these factories. They made movements for other clock makers who had their own name imprinted onto the movement because they were buying so many. Best to use the identification page to narrow down exactly who made the clock movement, then return to this page.
  • 2. Get the CM numbers, or PL numbers from the back plate of the movement itself. This will be matched up with what we are offering.
  • 3. Determine the bob diameter needed. Measure how wide the inside of the case is and then subtract 4 inches. This will be the maximum pendulum bob diameter allowed in the clock case.
  • 4. Decide between Lyre, Wood stick, or a brass rod pendulum if the options are there. They all come with a brass round bob for the end, but leading down to the bob can be any of these three styles.
  • 5. Order it
  • 6. After the pendulum is received and installed on the clock, Put The Clock In Beat.

Pendulum Measuring on a German Clock

Measure the pendulum for a German Clock from the very top of the movement down to the very bottom of the pendulum rating nut threads. If the clock says something like 94cm, choose 94cm from the list, making sure it also lists the correct bob diameter. Clockworks.com will calculate the length, making sure it is correct, before shipping it. A customer may receive the pendulum and think that it is not the correct length. Most likely, this is not the situation. Ordering a pendulum for a Hermle 94cm movement, does not mean you will get a 94cm long pendulum. The pendulum you get may be shorter, although it will be correct.

Determining Bob Diameter

Bob diameters vary so that they will not hit the sides of the case. Bob width is determined by the inside of the case width. Measure how wide the inside of the clock case is and then subtract 4 inches from that measurement. That measurement is the largest diameter bob that can be used in the clock case. A smaller diameter bob can be used, but not a larger one.

Pendulum clocks need to be put "In Beat"

After installing the new clock pendulum the clock will need an adjustment for it to run correctly. This is very easy to do and only takes a few minutes. No mechanical pendulum clock will run right without putting it "In Beat" first.

The content of this website is copyright by Clockworks and written by James Stoudenmire

Types of Clock Pendulums

After knowing who made the clock, it is time to decide what pendulum style is best. Clock pendulums can be divided into three basic categories. Very short mantle clock pendulums will use a mantle bob and these are not discussed in this section. If you have a short mantle clock please search for a mantle bob instead. What is covered here are the types of clock pendulums available for shelf, wall and floor clocks.

  • The brass rod style pendulum for small shelf or wall clocks.
  • Metal Lyre style pendulums for floor clocks.
  • Wood stick pendulums that are used on everything.
Types of Clock Pendulums

Metal Lyre

A metal Lyre style pendulum are used for floor clocks. A floor clock can mean a grandfather, grandmother, or granddaughter clock. We offer these for German post WW2 units such as Urgos, Kieninger, Jauch and Hermle units. These are the only post WW2 German units made, despite the fact it may something other than these names. The names may vary on the back plate because companies would pay to have there name on the movement instead.

Wood stick style clock pendulum

Wood Stick

The wood stick will come unstained. This is so the stick can be stained the proper color to match the clock case. The wood stick pendulum consists of the stick with the hardware and also the round bob. The good thing about wood stick pendulums is they can be shortened if needed.

Types of Clock Pendulums

Brass Rod

The brass rod types of clock pendulums are mainly used on shelf clocks or wall clocks. Sometimes they are used in grand daughter or grand mother clocks, but not as common. These cost more for two reasons, there made of brass and also they are custom cut to size by us here at Clockworks. We will cut it to the exact length you need for your specific clock movement upon your ordering.

The content of this website is copyright by Clockworks and written by James Stoudenmire

Grandfather Clock Pendulum Information

The length of the pendulum on German units comes in a few CM options. German units measure the pendulum from the top of the movement to the bottom of the nut threads. The pendulum itself, the leader it hangs on, and the suspension that the leader hangs on. All three components in centimeters make up that CM length in the drop down menu.

Pendulum length information

To know how long the actual pendulum is, subtract 15CM from the options with the pendulum length. This will exclude the leader and suspension, and be the actual pendulum length from tip to tip off of the clock. This length can vary as if a larger pendulum bob is selected, the actual length of the pendulum gets longer. Why the CM length matters at all is because if the pendulum length is not near the CM length of the movement, the clock will not keep time. So the gearing in the movement and the pendulum length works together to keep time around the specified CM length.

The bob width Options

A Lyre grandfather clock pendulum comes with either a 6 1/2, 8 1/2, or 10 1/2 inch bob diameters. The 'Bob' is the round disk at the bottom of the pendulum . The CM length on the movement will indicate the length of the pendulum from the TOP of the movement all the way down to the bottom of the pendulum nut threads. This is an approximate length that depends on other factors such as bob diameter and weight of the pendulum . Basically if the CM is 94CM the pendulum itself will be about 35 inches tip to tip off of the clock, and the 114CM option would put this same measurement at approximately 44 inches.

Hermle Clock Pendulum Measuring

If a Hermle clock doesn't keep proper time, the pendulum may be incorrect. To determine if this is the problem, all of the components of the Hermle clock pendulum need to be measured. Hermle clock pendulum measuring is extremely important. Often enough the CM length stamped on the movement is not the actual pendulum length. Certainly, the CM stamp provides valuable information, however it does not state what the Hermle clock pendulum needs to be from tip to tip. This section describes what the CM stamp represents, as well as how it needs to be measured.

What the CM represents

To measure a Hermle clock pendulum, start at the very top of the movement. Continue all the way down to the bottom of the rating nut on the pendulum. The CM number will only be accurate to the pendulum length if the bob diameter is small. In other words, the larger, or the heavier, the bob is, the longer the pendulum needs to be despite the stamped length on the movement. If confused, please email [email protected] in order to determine the best pendulum length. Please provide the CM length stamped on the back plate of the movement. Also, include the width of the pendulum bob. The bob is the round disk at the bottom of the pendulum.

Parts that are measured

The pendulum length (**cm) is the distance from the suspension post all the way down. Meaning to the bottom of the pendulum nut threads. This measurement includes the pendulum from tip to tip, the leader it hangs on, and the suspension spring. This pendulum length will not always be the same as what is marked on the movement. Subsequently there are also other factors that play into this measurement. For instance, the pendulum bob diameter. The larger the pendulum bob diameter, the longer the pendulum length needs to be despite the CM length.

Conclusion

In conclusion, if the CM length on the old unit matches the CM length on the new unit it will keep proper time with the same pendulum. There are times when the old leader needs to be used on the new movement, but this is not common.

The content of this website is copyright by Clockworks and written by James Stoudenmire

The Mechanical Clock Pendulum Assembly

The mechanical clock pendulum assembly does not mean just the pendulum alone. When the word assembly is used it means the pendulum consists of three components and not just the pendulum. A pendulum assembly consists of the suspension spring way up top, the leader that hangs on it, and then the pendulum.

Pendulum styles

Usually clock pendulum makers are not movement makers and the two are married together by a person or place. A place such as Clockworks.com or Howard Miller instead of the movement manufacturer. This is interesting because it explains why there can be so many variants of pendulums available for one movement. The pendulum could be a brass rod, wood stick, or metal lyre style.

Pendulum bob diameter size

What bob diameter sizing for the clock case so it both looks good and at the same time not wack the sides of the case. A good rule for the bob diameter is it needs two inches on each side to swing. So if the clock case is 12 inches wide the bob cannot be more than 10 inches. In this example we would need a 10 inch bob but these are not made. So the choice is clear that for a 12 inch wide clock case the bob size to get is 8 1/2 inch wide at maximum. If this rule is not used and the 10 inch wide is use the clock may go tick knock tock knock as it hits the sides each swing. Eventually the clock will stop running from this resistance.

Pendulum lengths

The length of the pendulum has to be correct for the gearing inside the movement. If the pendulum is too long the clock will be too slow. If the pendulum is too short the clock is too fast. When a clock is too fast or slow it usually has nothing to do with the movement itself. It only has to do with the pendulum length alone and nothing else.

Pendulum top mount hook

The top hook has to hook up to the movements pendulum leader. The leader is the part that holds the pendulum up in the air and is hooked to the suspension spring. Sometimes an old pendulum will not hook to the new movement the same way as it did in the past but this not common. A new top hook may or may not needed for the pendulum.

Pendulum leader

The leader is the 3 to 7 inch long part that the pendulum hangs onto. Installation of the leader is done in a way that it hangs onto the suspension spring on the top of the movement. At the same time it will have the crutch on the back of the movement engaged with the center of the leader. The crutch is the wig wag part that is sticking out of the back of the movement. Leader installation is done by removing the set screw on the top of the suspension spring. With the suspension free it can be lowered to hook onto the leader and be brought back up. The leader is hooked to the suspension and the crutch on the back of the movement at the same time. This assembly gets brought back up again to mount with the set screw like it was.

The content of this website is copyright by Clockworks and written by James Stoudenmire

The mechanical clock pendulum length

A pendulum clock without a pendulum is a shame for sure. Getting the correct pendulum does take some diving into the clock world. If you have no idea what pendulum it would take, this is a basic guide. This is a basic guide to narrow it down to the best pendulum for your clock. This will cover most situations, without special equipment to figure out the length.

The movement CM or PL stamp

On the back plate of the clock movement usually, there are some numbers and or letters for identification. There maybe an indication of how long the pendulum should be in the mix of these numbers. It may say CM or PL and this stands for centimeters or pendulum length. This would be the length where it should keep approximate time. This is measured in a few different ways usually dependent on country of origin.

German made movements

Most mechanical German made clock movements are easy to figure out the pendulum length. The numbers will let us know or the clearly indicated CM or PL number will be stamped. If it is German, keep in mind the CM length is not the actual pendulum length. German units measure this length from the top of the clock movement, and this includes the three components of the pendulum all in one length, in centimeters. This length will include the pendulum itself, the leader that it hooks to, and the suspension spring on the top that the leader hooks on to, all in one CM measurement. CM stands for centimeters and PL stands for pendulum length.

If no stamp try to convert

With no pendulum length stamped into the movement some added steps are involved. The numbers on the back plate will cross reference to the pendulum length required. The first step is to identify the manufacturer of the clock movement by using the movement numbers. The movement numbers indicate who actually manufactured the movement. Various clock retailers may have have their name stamped onto it, but the numbers are always true to the manufacturer.

Converting numbers to CM length

Some movements do not have an indication of the pendulum length on the back plate. The unit will have a number that would need to be found on this website first to find out what the correct CM length is for it.

Converted number example

Let's say that the movement has no CM stamp on the movement and only shows the number UW32319. Go to the identification page to look at the movement number examples. In this example, we see that it is a Urgos. Now it is possible to go to the Urgos page and find the number to see what the pendulum length is. In this example, the pendulum length would be 80cm, representing the full length with the size of the bob factored in.

German grandfather movements

Almost all grandfather clock movements are going to be German if made after 1950. The first thing we need to do is get the numbers off of the back plate of the movement. This is the only way, and we can't cheat by looking at the paperwork or clock case. It has to come right off the back of the clockworks. The manual and the sticker on the case is of no use to get the pendulum.

American clocks

The American mechanical clock movement manufacturers referred to the pendulum length as a "drop". The drop is the length of the pendulum from the hand shaft all the way down to the bottom of the pendulum rating nut threads. It is a different way of measuring the pendulum length then the German made way. Both ways are based on the smallest bob diameter bob. If the bob is larger or heavier, the length would be longer than what is stamped.

No luck

If everything fails for one reason or another, the best chance for a pendulum is the wood stick style. This is the only style of pendulum that can be easily modified because you can chop it. These types of clocks are usually antiques, or of Asian origin, and information such as pendulum length is simply not available. Sometimes it takes a good guess on where the manufacturer intended to have the bob sit.

To do it this way, you only need a pendulum with a stick that is way too long to begin with. Chop it, try it, chop it, try it. Each time your slow, cut an inch and half off of the sticks length and hang it back on. It will only take a couple of times, and if you start way too long you can always go shorter.

Clock makers method

There is another way, its called setting the beat rate. This is a more involved way and usually just done by clock makers. It involves a beat detecting device that counts out the beats per hour, or the beats per minute. To do this, first you would need to know what the beat rate is supposed to be for that particular movement, and then keep adjusting the pendulum length until you have it keeping time. There are cell phone apps out there these days that will tell you the beat rate and the cell phone will listen and tell you if the clock will keep time with that pendulum. You go longer or shorter until your phone says the beat rate is set.

Contacting us for help

Please email the movement numbers from the back plate, and explain what part is needed. The email address to send this information is [email protected] Pictures are welcomed but not required. If emailing pictures please include the back side of the clock movement where the markings are.

The content of this website is copyright by Clockworks and written by James Stoudenmire

Timing a mechanical pendulum clock

Timing the clock is all about the overall pendulum length and rarely has anything to do with the movement itself. Mechanical clock is easy to time providing you have the correct pendulum. When the pendulum is correct for that particular movement it will hang on the leader and keep approximate time. The fine timing can be done only with the pendulum adjustment located at the very bottom. At the bottom of the bob is some adjustment threads and a nut. To turn the nut one way raises the bob and the other lowers it. A shorter pendulum will make the clock run faster. A longer pendulum makes the clock run slower.

Fine timing the clock

If the clock is timing slow, raise the pendulum bob by turning the nut at the bottom of the bob. If the clock is fast, do the same but raise the clock's pendulum bob instead. One full turn is somewhere around 1-2 minutes a day faster or slower.

If there is no more adjustment

If the bob is all the way up and its still too slow or fast, you can shorten either the pendulum or the leader it hangs on to correct.

A lyre pendulum that does not keep time with the bob all the way adjusted will need its length altered. The overall length can be altered by the pendulum itself or the leader it hangs onto. The leader is about 5 to 7 inches long and engages with the crutch on back of the movement. The leader is the part that the pendulum top hooks on to. It is possible to shorten or lengthen the pendulum leader to put the clock in time range with some solder if needed. 1 3/4 inches is a good measurement to make one of these longer or shorter as needed, as this is the length of the threads at the bottom of the bob. So it will give you a full timing adjustment range all over again and you can go up or down as needed.

German pendulum length CM stamp

The pendulum length is considered overall and not just the pendulum. For example if the clock says 94cm on the back of it, this is the way the Germans measure there pendulum lengths from the top of the movement and all the way down. This will include the suspension spring way up top, the pendulum leader or guide you can call it, and also the pendulum from tip to tip all with a 4 1/2 inch bob diameter. Of course the larger the bob, the longer it will be beyond that 94cm measurement.

Used to keep time, now does not

If the clock kept time in the past but now does not, it means a worn gear. The escape wheel is worn and it is advancing more than one tooth at a time. The escape wheel alone would be hard to find, and hard to replace both. The entire movement would be disassembled to replace this worn escape wheel if there is another one found that will work. The cost of having this done would be the same price as a new movement. There is no such thing as having a repair on a clock movement being better than a new movement. The price would be about the same for a complete overhaul or a brand new one. First see if the clock movement is in production and available new. We do this by getting the numbers off of the back plate of the movement itself, right off of the brass. The email address is [email protected] and we will check availability and quote for the new one. If the movement is not in production anymore, then a repair is the only option.

Mechanical Pendulum Clock Timing Issues - Conclusion

Fine timing of the clock is easy as you can see. If the clock kept time in the past and now too fast, its time for a new movement and has nothing to do with the pendulum. A worn escape wheel is most likely the cause and a new unit would be less cost then a repair.

The content of this website is copyright by Clockworks and written by James Stoudenmire

UW-Urgos Stick Clock Pendulum ordering

This movement series can be tricky to determine how long the pendulum is supposed to be. This is because they did not often stamp the CM number on the back plate of the movement. Instead we need to look it up by the number. Such as if it says UW32319 the chart will tell us that is an 80cm movement. This does not mean the pendulum itself will come 80cm as noted below. If the movement has an old number, it must first be converted to the new number, and that new number will give us the CM length. Wow, huh? If this is too much just email the numbers and we will tell you what pendulum you will need. To go at it on your own, here is the chart to figure out the CM length is needed. It can be found at this link and then come back here to continue ordering the pendulum.

Pendulum ordering requires the CM number

The CM number off of the Urgos clock movement itself is required to get the right pendulum. This information is not on the paper work and not on the wood case. Rather it would be a stamp on the brass clock movement's back plate instead. It will say a number such as 93CM or 116CM, some number followed by CM (centimeters) if it is there.

Sequential steps to pendulum obtainment

  • 1. Know who really made the movement. If the clock was made in Germany post WW2, it will be one of four makers. Hermle, Jauch, Kieninger, or Urgos. If none of these names are on the movement it is still, most likely made by one of these factories. They made movements for other clock makers who had their own name imprinted onto the movement because they were buying so many. Best to use the identification page to narrow down exactly who made the clock movement, then return to this page.
  • 2. Get the CM numbers, or PL numbers from the back plate of the movement itself. This will be matched up with what we are offering.
  • 3. Determine the bob diameter needed. Measure how wide the inside of the case is and then subtract 4 inches. This will be the maximum pendulum bob diameter allowed in the clock case.
  • 4. Decide between Lyre, Wood stick, or a brass rod pendulum if the options are there. They all come with a brass round bob for the end, but leading down to the bob can be any of these three styles.
  • 5. Order it
  • 6. After the pendulum is received and installed on the clock, Put The Clock In Beat.

Pendulum Measuring on a German Clock

Measure the pendulum for a German Clock from the very top of the movement down to the very bottom of the pendulum rating nut threads. If the clock says something like 94cm, choose 94cm from the list, making sure it also lists the correct bob diameter. Clockworks.com will calculate the length, making sure it is correct, before shipping it. A customer may receive the pendulum and think that it is not the correct length. Most likely, this is not the situation. Ordering a pendulum for a Hermle 94cm movement, does not mean you will get a 94cm long pendulum. The pendulum you get may be shorter, although it will be correct.

Determining Bob Diameter

Bob diameters vary so that they will not hit the sides of the case. Bob width is determined by the inside of the case width. Measure how wide the inside of the clock case is and then subtract 4 inches from that measurement. That measurement is the largest diameter bob that can be used in the clock case. A smaller diameter bob can be used, but not a larger one.

Pendulum clocks need to be put "In Beat"

After installing the new clock pendulum the clock will need an adjustment for it to run correctly. This is very easy to do and only takes a few minutes. No mechanical pendulum clock will run right without putting it "In Beat" first.

The content of this website is copyright by Clockworks and written by James Stoudenmire

UW-Urgos Identification

Urgos clock movement identification

Stick Pendulum for Kieninger Clocks

Mechanical Clock PendulumsHow to orderPendulum TypesGerman UnitsHermle CM DescPendulum PartsLength IndicatorsTiming

Please view these information tabs to help with determining the proper Mechanical Clock Pendulums for your clock.

Sequential steps to pendulum obtainment

  • 1. Know who really made the movement. If the clock was made in Germany post WW2, it will be one of four makers. Hermle, Jauch, Kieninger, or Urgos. If none of these names are on the movement it is still, most likely made by one of these factories. They made movements for other clock makers who had their own name imprinted onto the movement because they were buying so many. Best to use the identification page to narrow down exactly who made the clock movement, then return to this page.
  • 2. Get the CM numbers, or PL numbers from the back plate of the movement itself. This will be matched up with what we are offering.
  • 3. Determine the bob diameter needed. Measure how wide the inside of the case is and then subtract 4 inches. This will be the maximum pendulum bob diameter allowed in the clock case.
  • 4. Decide between Lyre, Wood stick, or a brass rod pendulum if the options are there. They all come with a brass round bob for the end, but leading down to the bob can be any of these three styles.
  • 5. Order it
  • 6. After the pendulum is received and installed on the clock, Put The Clock In Beat.

Pendulum Measuring on a German Clock

Measure the pendulum for a German Clock from the very top of the movement down to the very bottom of the pendulum rating nut threads. If the clock says something like 94cm, choose 94cm from the list, making sure it also lists the correct bob diameter. Clockworks.com will calculate the length, making sure it is correct, before shipping it. A customer may receive the pendulum and think that it is not the correct length. Most likely, this is not the situation. Ordering a pendulum for a Hermle 94cm movement, does not mean you will get a 94cm long pendulum. The pendulum you get may be shorter, although it will be correct.

Determining Bob Diameter

Bob diameters vary so that they will not hit the sides of the case. Bob width is determined by the inside of the case width. Measure how wide the inside of the clock case is and then subtract 4 inches from that measurement. That measurement is the largest diameter bob that can be used in the clock case. A smaller diameter bob can be used, but not a larger one.

Pendulum clocks need to be put "In Beat"

After installing the new clock pendulum the clock will need an adjustment for it to run correctly. This is very easy to do and only takes a few minutes. No mechanical pendulum clock will run right without putting it "In Beat" first.

The content of this website is copyright by Clockworks and written by James Stoudenmire

Types of Clock Pendulums

After knowing who made the clock, it is time to decide what pendulum style is best. Clock pendulums can be divided into three basic categories. Very short mantle clock pendulums will use a mantle bob and these are not discussed in this section. If you have a short mantle clock please search for a mantle bob instead. What is covered here are the types of clock pendulums available for shelf, wall and floor clocks.

  • The brass rod style pendulum for small shelf or wall clocks.
  • Metal Lyre style pendulums for floor clocks.
  • Wood stick pendulums that are used on everything.
Types of Clock Pendulums

Metal Lyre

A metal Lyre style pendulum are used for floor clocks. A floor clock can mean a grandfather, grandmother, or granddaughter clock. We offer these for German post WW2 units such as Urgos, Kieninger, Jauch and Hermle units. These are the only post WW2 German units made, despite the fact it may something other than these names. The names may vary on the back plate because companies would pay to have there name on the movement instead.

Wood stick style clock pendulum

Wood Stick

The wood stick will come unstained. This is so the stick can be stained the proper color to match the clock case. The wood stick pendulum consists of the stick with the hardware and also the round bob. The good thing about wood stick pendulums is they can be shortened if needed.

Types of Clock Pendulums

Brass Rod

The brass rod types of clock pendulums are mainly used on shelf clocks or wall clocks. Sometimes they are used in grand daughter or grand mother clocks, but not as common. These cost more for two reasons, there made of brass and also they are custom cut to size by us here at Clockworks. We will cut it to the exact length you need for your specific clock movement upon your ordering.

The content of this website is copyright by Clockworks and written by James Stoudenmire

Grandfather Clock Pendulum Information

The length of the pendulum on German units comes in a few CM options. German units measure the pendulum from the top of the movement to the bottom of the nut threads. The pendulum itself, the leader it hangs on, and the suspension that the leader hangs on. All three components in centimeters make up that CM length in the drop down menu.

Pendulum length information

To know how long the actual pendulum is, subtract 15CM from the options with the pendulum length. This will exclude the leader and suspension, and be the actual pendulum length from tip to tip off of the clock. This length can vary as if a larger pendulum bob is selected, the actual length of the pendulum gets longer. Why the CM length matters at all is because if the pendulum length is not near the CM length of the movement, the clock will not keep time. So the gearing in the movement and the pendulum length works together to keep time around the specified CM length.

The bob width Options

A Lyre grandfather clock pendulum comes with either a 6 1/2, 8 1/2, or 10 1/2 inch bob diameters. The 'Bob' is the round disk at the bottom of the pendulum . The CM length on the movement will indicate the length of the pendulum from the TOP of the movement all the way down to the bottom of the pendulum nut threads. This is an approximate length that depends on other factors such as bob diameter and weight of the pendulum . Basically if the CM is 94CM the pendulum itself will be about 35 inches tip to tip off of the clock, and the 114CM option would put this same measurement at approximately 44 inches.

Hermle Clock Pendulum Measuring

If a Hermle clock doesn't keep proper time, the pendulum may be incorrect. To determine if this is the problem, all of the components of the Hermle clock pendulum need to be measured. Hermle clock pendulum measuring is extremely important. Often enough the CM length stamped on the movement is not the actual pendulum length. Certainly, the CM stamp provides valuable information, however it does not state what the Hermle clock pendulum needs to be from tip to tip. This section describes what the CM stamp represents, as well as how it needs to be measured.

What the CM represents

To measure a Hermle clock pendulum, start at the very top of the movement. Continue all the way down to the bottom of the rating nut on the pendulum. The CM number will only be accurate to the pendulum length if the bob diameter is small. In other words, the larger, or the heavier, the bob is, the longer the pendulum needs to be despite the stamped length on the movement. If confused, please email [email protected] in order to determine the best pendulum length. Please provide the CM length stamped on the back plate of the movement. Also, include the width of the pendulum bob. The bob is the round disk at the bottom of the pendulum.

Parts that are measured

The pendulum length (**cm) is the distance from the suspension post all the way down. Meaning to the bottom of the pendulum nut threads. This measurement includes the pendulum from tip to tip, the leader it hangs on, and the suspension spring. This pendulum length will not always be the same as what is marked on the movement. Subsequently there are also other factors that play into this measurement. For instance, the pendulum bob diameter. The larger the pendulum bob diameter, the longer the pendulum length needs to be despite the CM length.

Conclusion

In conclusion, if the CM length on the old unit matches the CM length on the new unit it will keep proper time with the same pendulum. There are times when the old leader needs to be used on the new movement, but this is not common.

The content of this website is copyright by Clockworks and written by James Stoudenmire

The Mechanical Clock Pendulum Assembly

The mechanical clock pendulum assembly does not mean just the pendulum alone. When the word assembly is used it means the pendulum consists of three components and not just the pendulum. A pendulum assembly consists of the suspension spring way up top, the leader that hangs on it, and then the pendulum.

Pendulum styles

Usually clock pendulum makers are not movement makers and the two are married together by a person or place. A place such as Clockworks.com or Howard Miller instead of the movement manufacturer. This is interesting because it explains why there can be so many variants of pendulums available for one movement. The pendulum could be a brass rod, wood stick, or metal lyre style.

Pendulum bob diameter size

What bob diameter sizing for the clock case so it both looks good and at the same time not wack the sides of the case. A good rule for the bob diameter is it needs two inches on each side to swing. So if the clock case is 12 inches wide the bob cannot be more than 10 inches. In this example we would need a 10 inch bob but these are not made. So the choice is clear that for a 12 inch wide clock case the bob size to get is 8 1/2 inch wide at maximum. If this rule is not used and the 10 inch wide is use the clock may go tick knock tock knock as it hits the sides each swing. Eventually the clock will stop running from this resistance.

Pendulum lengths

The length of the pendulum has to be correct for the gearing inside the movement. If the pendulum is too long the clock will be too slow. If the pendulum is too short the clock is too fast. When a clock is too fast or slow it usually has nothing to do with the movement itself. It only has to do with the pendulum length alone and nothing else.

Pendulum top mount hook

The top hook has to hook up to the movements pendulum leader. The leader is the part that holds the pendulum up in the air and is hooked to the suspension spring. Sometimes an old pendulum will not hook to the new movement the same way as it did in the past but this not common. A new top hook may or may not needed for the pendulum.

Pendulum leader

The leader is the 3 to 7 inch long part that the pendulum hangs onto. Installation of the leader is done in a way that it hangs onto the suspension spring on the top of the movement. At the same time it will have the crutch on the back of the movement engaged with the center of the leader. The crutch is the wig wag part that is sticking out of the back of the movement. Leader installation is done by removing the set screw on the top of the suspension spring. With the suspension free it can be lowered to hook onto the leader and be brought back up. The leader is hooked to the suspension and the crutch on the back of the movement at the same time. This assembly gets brought back up again to mount with the set screw like it was.

The content of this website is copyright by Clockworks and written by James Stoudenmire

The mechanical clock pendulum length

A pendulum clock without a pendulum is a shame for sure. Getting the correct pendulum does take some diving into the clock world. If you have no idea what pendulum it would take, this is a basic guide. This is a basic guide to narrow it down to the best pendulum for your clock. This will cover most situations, without special equipment to figure out the length.

The movement CM or PL stamp

On the back plate of the clock movement usually, there are some numbers and or letters for identification. There maybe an indication of how long the pendulum should be in the mix of these numbers. It may say CM or PL and this stands for centimeters or pendulum length. This would be the length where it should keep approximate time. This is measured in a few different ways usually dependent on country of origin.

German made movements

Most mechanical German made clock movements are easy to figure out the pendulum length. The numbers will let us know or the clearly indicated CM or PL number will be stamped. If it is German, keep in mind the CM length is not the actual pendulum length. German units measure this length from the top of the clock movement, and this includes the three components of the pendulum all in one length, in centimeters. This length will include the pendulum itself, the leader that it hooks to, and the suspension spring on the top that the leader hooks on to, all in one CM measurement. CM stands for centimeters and PL stands for pendulum length.

If no stamp try to convert

With no pendulum length stamped into the movement some added steps are involved. The numbers on the back plate will cross reference to the pendulum length required. The first step is to identify the manufacturer of the clock movement by using the movement numbers. The movement numbers indicate who actually manufactured the movement. Various clock retailers may have have their name stamped onto it, but the numbers are always true to the manufacturer.

Converting numbers to CM length

Some movements do not have an indication of the pendulum length on the back plate. The unit will have a number that would need to be found on this website first to find out what the correct CM length is for it.

Converted number example

Let's say that the movement has no CM stamp on the movement and only shows the number UW32319. Go to the identification page to look at the movement number examples. In this example, we see that it is a Urgos. Now it is possible to go to the Urgos page and find the number to see what the pendulum length is. In this example, the pendulum length would be 80cm, representing the full length with the size of the bob factored in.

German grandfather movements

Almost all grandfather clock movements are going to be German if made after 1950. The first thing we need to do is get the numbers off of the back plate of the movement. This is the only way, and we can't cheat by looking at the paperwork or clock case. It has to come right off the back of the clockworks. The manual and the sticker on the case is of no use to get the pendulum.

American clocks

The American mechanical clock movement manufacturers referred to the pendulum length as a "drop". The drop is the length of the pendulum from the hand shaft all the way down to the bottom of the pendulum rating nut threads. It is a different way of measuring the pendulum length then the German made way. Both ways are based on the smallest bob diameter bob. If the bob is larger or heavier, the length would be longer than what is stamped.

No luck

If everything fails for one reason or another, the best chance for a pendulum is the wood stick style. This is the only style of pendulum that can be easily modified because you can chop it. These types of clocks are usually antiques, or of Asian origin, and information such as pendulum length is simply not available. Sometimes it takes a good guess on where the manufacturer intended to have the bob sit.

To do it this way, you only need a pendulum with a stick that is way too long to begin with. Chop it, try it, chop it, try it. Each time your slow, cut an inch and half off of the sticks length and hang it back on. It will only take a couple of times, and if you start way too long you can always go shorter.

Clock makers method

There is another way, its called setting the beat rate. This is a more involved way and usually just done by clock makers. It involves a beat detecting device that counts out the beats per hour, or the beats per minute. To do this, first you would need to know what the beat rate is supposed to be for that particular movement, and then keep adjusting the pendulum length until you have it keeping time. There are cell phone apps out there these days that will tell you the beat rate and the cell phone will listen and tell you if the clock will keep time with that pendulum. You go longer or shorter until your phone says the beat rate is set.

Contacting us for help

Please email the movement numbers from the back plate, and explain what part is needed. The email address to send this information is [email protected] Pictures are welcomed but not required. If emailing pictures please include the back side of the clock movement where the markings are.

The content of this website is copyright by Clockworks and written by James Stoudenmire

Timing a mechanical pendulum clock

Timing the clock is all about the overall pendulum length and rarely has anything to do with the movement itself. Mechanical clock is easy to time providing you have the correct pendulum. When the pendulum is correct for that particular movement it will hang on the leader and keep approximate time. The fine timing can be done only with the pendulum adjustment located at the very bottom. At the bottom of the bob is some adjustment threads and a nut. To turn the nut one way raises the bob and the other lowers it. A shorter pendulum will make the clock run faster. A longer pendulum makes the clock run slower.

Fine timing the clock

If the clock is timing slow, raise the pendulum bob by turning the nut at the bottom of the bob. If the clock is fast, do the same but raise the clock's pendulum bob instead. One full turn is somewhere around 1-2 minutes a day faster or slower.

If there is no more adjustment

If the bob is all the way up and its still too slow or fast, you can shorten either the pendulum or the leader it hangs on to correct.

A lyre pendulum that does not keep time with the bob all the way adjusted will need its length altered. The overall length can be altered by the pendulum itself or the leader it hangs onto. The leader is about 5 to 7 inches long and engages with the crutch on back of the movement. The leader is the part that the pendulum top hooks on to. It is possible to shorten or lengthen the pendulum leader to put the clock in time range with some solder if needed. 1 3/4 inches is a good measurement to make one of these longer or shorter as needed, as this is the length of the threads at the bottom of the bob. So it will give you a full timing adjustment range all over again and you can go up or down as needed.

German pendulum length CM stamp

The pendulum length is considered overall and not just the pendulum. For example if the clock says 94cm on the back of it, this is the way the Germans measure there pendulum lengths from the top of the movement and all the way down. This will include the suspension spring way up top, the pendulum leader or guide you can call it, and also the pendulum from tip to tip all with a 4 1/2 inch bob diameter. Of course the larger the bob, the longer it will be beyond that 94cm measurement.

Used to keep time, now does not

If the clock kept time in the past but now does not, it means a worn gear. The escape wheel is worn and it is advancing more than one tooth at a time. The escape wheel alone would be hard to find, and hard to replace both. The entire movement would be disassembled to replace this worn escape wheel if there is another one found that will work. The cost of having this done would be the same price as a new movement. There is no such thing as having a repair on a clock movement being better than a new movement. The price would be about the same for a complete overhaul or a brand new one. First see if the clock movement is in production and available new. We do this by getting the numbers off of the back plate of the movement itself, right off of the brass. The email address is [email protected] and we will check availability and quote for the new one. If the movement is not in production anymore, then a repair is the only option.

Mechanical Pendulum Clock Timing Issues - Conclusion

Fine timing of the clock is easy as you can see. If the clock kept time in the past and now too fast, its time for a new movement and has nothing to do with the pendulum. A worn escape wheel is most likely the cause and a new unit would be less cost then a repair.

The content of this website is copyright by Clockworks and written by James Stoudenmire

Stick Pendulum for Kieninger Clocks ordering

The CM number off of the Kieninger clock movement itself is required to get the right pendulum. This information is not on the paper work and not on the wood case. Rather it would be a stamp on the brass clock movement's back plate instead. It will say a number such as 93CM or 116CM, some number followed by CM (centimeters).

Stick Pendulum Description

This Kieninger wood stick clock pendulum will come unstained so it can be stained the proper color to match the clock case. The wood stick pendulum consists of the stick with the hardware and also the bob in the diameter chosen. The good thing about wood stick pendulums is they can be shortened if needed.

Sequential steps to pendulum obtainment

  • 1. Know who really made the movement. If the clock was made in Germany post WW2, it will be one of four makers. Hermle, Jauch, Kieninger, or Urgos. If none of these names are on the movement it is still, most likely made by one of these factories. They made movements for other clock makers who had their own name imprinted onto the movement because they were buying so many. Best to use the identification page to narrow down exactly who made the clock movement, then return to this page.
  • 2. Get the CM numbers, or PL numbers from the back plate of the movement itself. This will be matched up with what we are offering.
  • 3. Determine the bob diameter needed. Measure how wide the inside of the case is and then subtract 4 inches. This will be the maximum pendulum bob diameter allowed in the clock case.
  • 4. Decide between Lyre, Wood stick, or a brass rod pendulum if the options are there. They all come with a brass round bob for the end, but leading down to the bob can be any of these three styles.
  • 5. Order it
  • 6. After the pendulum is received and installed on the clock, Put The Clock In Beat.

Pendulum Measuring on a German Clock

Measure the pendulum for a German Clock from the very top of the movement down to the very bottom of the pendulum rating nut threads. If the clock says something like 94cm, choose 94cm from the list, making sure it also lists the correct bob diameter. Clockworks.com will calculate the length, making sure it is correct, before shipping it. A customer may receive the pendulum and think that it is not the correct length. Most likely, this is not the situation. Ordering a pendulum for a Hermle 94cm movement, does not mean you will get a 94cm long pendulum. The pendulum you get may be shorter, although it will be correct.

Determining Bob Diameter

Bob diameters vary so that they will not hit the sides of the case. Bob width is determined by the inside of the case width. Measure how wide the inside of the clock case is and then subtract 4 inches from that measurement. That measurement is the largest diameter bob that can be used in the clock case. A smaller diameter bob can be used, but not a larger one.

Pendulum clocks need to be put "In Beat"

After installing the new clock pendulum the clock will need an adjustment for it to run correctly. This is very easy to do and only takes a few minutes. No mechanical pendulum clock will run right without putting it "In Beat" first.

The content of this website is copyright by Clockworks and written by James Stoudenmire

Kieninger clock movement identification

The first step to replace the movement or any components is to first do the identification process on the Kieninger clock movement. To get the new clock movement price and what it includes, we start with the numbers. The numbers are also required to get components of the clock also. Components include pendulums, dials, hands, keys, cranks, chime blocks, mounting screws, weights, pulleys or chains.

Decoding Kieninger clock movements

For example lets say the movement numbers are 81 K 116cm.

  • 1981 =The first numbers 81 is the year made if it is an on older unit. On the new units this number is not the year but only an internal engineering code.
  • K = The K is the movements series. This is the basic raw movement plate size and internal gear configuration.
  • 116CM = The pendulum length in centimeters measured from the top of the movement all the down. Based on the smallest 4 1/2 inch bob diameter.

Kieninger Clock Movement Identification

Dating the Kieninger movement

Above is stated 81 was the date, however this has changed in the later years. After a certain date that first number is no longer the date produced. So it may or may not be the date, but you can just ignore that first number when replacing the unit. There is no longer a solid way to date the Kieninger clock movement unless it is stamped on the plate.

We can help

The new movement will fit into the clock case just as the old one did. Keep using the same components such as the dial, pendulum, chime block and weights. If it is a weight driven clock it will come with the chains or cables with pulleys. If this decoding process is confusing, just email the numbers or a picture to [email protected] Kieninger clock movement questions and ordering can be done by phone also 800-381-7458.

The content of this website is copyright by Clockworks and written by James Stoudenmire

451-053 Clock Moon Dial for Hermle

Moon DialsMoon Dial OrderingRemoving the HandsMoon Dial InstallationMoon Dial History

Please view these information tabs to help with Grandfather Clock Moon Dials.

Grandfather Clock Moon Dial Ordering

Before ordering the new moon dial for the grandfather clock, this section must be read. Not all moon dials fit all clocks, each one is made for a specific clock movement. The reason is most moon dials have four feet, or posts, that stick out the back of the dial. These feet have to lock into the movement its being attached too. If the feet are in different locations, it will not lock into the movement. They must be married together so to speak. These grandfather clock moon dials are for post WW2 clocks only.

How to get the right moon dial

To get the correct moon dial for your clock, you will need the movement numbers. This will be directly off of the back plate of the movement itself. It will not be on any of the paperwork that came with the clock, or on the wood case. Movement numbers can only be found on the clockworks itself. With the movement numbers you can match up the number with the numbers posted on the moon dial description.

What has to match

  • The posts on the back of the dial need to lock into the movement. A hand shaft that is long on the movement, will require longer posts. In other words, the posts on the back of the dial make it so the hand shaft will stick out far enough to put the clock hands on.
  • If the movement is cable driven, the holes to wind the clock need to be in the right spot. This is important for when you put the key crank in. If it is aligned correctly, it will go onto the winding arbor of the movement. When it is not aligned properly, winding will be difficult or impossible.

  • Some clocks have a second hand bit which also has to be perfectly aligned. This goes onto the small post coming off of the escape wheel. The second hand is a friction fit.

On a chain driven unit, it is possible to get any moon dial and remove the feet off the clock dial. The dial would then have to be attached to the wood case instead. Because there are no winding arbors on a chain driven unit there are no holes in the dial to line up. There is also rarely a second hand bit. So you could use any dial with no winding holes and attach it to the wood case. However, one thing to mention is that the moon phase will most likely no longer spin.

The content of this website is copyright by Clockworks and written by James Stoudenmire

Removing Mechanical Clock Hands

Removing Mechanical Clock Hands is fast and easy to do. The following are instructions for German mechanical movements post WW2 hand removal.

German Post WW2 wall, mantle and floor models

Turn the hand nut to the left while holding the minute hand with your fingers. Some small needle nose pliers may be needed to loosen the nut first. Once the nut is loose, you can turn it with your fingers until it comes off. The minute hand will be able to wiggle straight off its square arbor and off of the clock. The hour hand is a friction fit, so just twist the hour hand back and forth and pull toward you until it comes off. If you have a second hand bit, that is only a friction also, so just grab it with your fingernails and pull toward you.

American Antique time and strike

These type of movements come in two styles. if there is a minute hand nut, the first style is the same as above. Be very careful not to lose this hand nut. They are very hard to find and replace. The second style will have a pin holding the minute hand on instead of a nut. This pin is tapered, meaning it's fat on one side and skinny on the other usually. Just grab the fat side with needle nose pliers and yank the pin out. The minute hand will fall out with a washer. Save the washer and the tapered pin for ease of reinstalling the hands.

The content of this website is copyright by Clockworks and written by James Stoudenmire

Grandfather Clock Moon Dial Installation

Grandfather clock moon dial installation is explained in this section. This is written for a new movement installation in mind. However it can be used for any post WW2 German mechanical units with issues related to the front of the movement.

The moon gear

The moon gear gets installed onto the new movement prior to the dial installation. It is only mounted with a set screw and is installed on the same tube as the hour hand. Install onto the new unit like it was on the old with the same approximate distance on the hand shaft. This will allow it to run the gears behind the clock dial therefor run the phase of the moon.

The selector switch

A selector switch is a steel arm that is about 1 to 2 inches in length with a set screw. It's purpose is to be able to select the songs or put the clock into silent mode. Install the selector switch on the arm coming out of the clock movement's right hand side. The selector switch is installed by sliding it over the larger arm and secured with the set screw. It only has to be able to come through the slot at 3 o'clock for the user to move it up or down.

Grandfather clock moon dial installation

The clock moon dial has four posts on the back that lock into the front plate of the movement. Line up the clock hand shaft to the hole in the center of the dial and then line up the posts with the holes in the movement. There are two ways to secure the four dial posts to the clock movement. One way has locking arms on the back of the front plate of the movement that slide over the end of the dial post to lock it tight. This is if both the dial and the movement are made this way. The other way this is done is if there are holes in the ends of the dial post feet that gets a pin to secure it to the movement. A included tapered pin will go through the hole in the post after it's on the movement's front plate.

The content of this website is copyright by Clockworks and written by James Stoudenmire

Clock Moon Dial History

The phase of the moon is still popular on modern mechanical clock movements. It is interesting to know why and when this started becoming a popular feature to add to grandfather clocks.

Why it started

In the late 1600's traveling took awhile and was also hazardous at night when it was dark. The people would depend on the light of the moon to see what they are doing when they were out. The phase of the moon function was added to the floor clocks for this purpose. People could make travel plans with the moon light helping them to see.

Developments

In the 1700's clocks started to have the hump on the top of the clock dial for the moon phase. The arched dial was able to accommodate the lunar display disk. The moon was painted on the disk and the disk would rotate once a month. It was a simple and practical addition to the clock.

Alternate Animations

Some clock dials with the arch were produced with alternate animations besides the moon phase. Rocking ships and jumping deer figures among other things would rock back and forth. These animations did not have any practical functionality as the phase of the moon did. It was a simple design and was connected to the pendulum motion. If the pendulum move, the animation would rock, they were connected.

That is the history of the clock moon dial in its simplest form. Interesting how people lived and relied so heavily on there clocks back then. In the days of outhouses and traveling with horse and buggy, a clock was an important appliance.

The content of this website is copyright by Clockworks and written by James Stoudenmire

451-053 Clock Moon Dial

For floor clocks, this moon dial is 11 x 15 1/2 with Arabic numerals on a silver chapter ring. The four dial feet on the back of the dial mount into the movement itself. Has the silent / chime option at 3 O'clock. This dial is available to fit the Hermle 451-053 clock movement.

1151-053 Grandmother Clock Moon-Dial

Moon DialsMoon Dial OrderingRemoving the HandsMoon Dial InstallationMoon Dial History

Please view these information tabs to help with Grandfather Clock Moon Dials.

Grandfather Clock Moon Dial Ordering

Before ordering the new moon dial for the grandfather clock, this section must be read. Not all moon dials fit all clocks, each one is made for a specific clock movement. The reason is most moon dials have four feet, or posts, that stick out the back of the dial. These feet have to lock into the movement its being attached too. If the feet are in different locations, it will not lock into the movement. They must be married together so to speak. These grandfather clock moon dials are for post WW2 clocks only.

How to get the right moon dial

To get the correct moon dial for your clock, you will need the movement numbers. This will be directly off of the back plate of the movement itself. It will not be on any of the paperwork that came with the clock, or on the wood case. Movement numbers can only be found on the clockworks itself. With the movement numbers you can match up the number with the numbers posted on the moon dial description.

What has to match

  • The posts on the back of the dial need to lock into the movement. A hand shaft that is long on the movement, will require longer posts. In other words, the posts on the back of the dial make it so the hand shaft will stick out far enough to put the clock hands on.
  • If the movement is cable driven, the holes to wind the clock need to be in the right spot. This is important for when you put the key crank in. If it is aligned correctly, it will go onto the winding arbor of the movement. When it is not aligned properly, winding will be difficult or impossible.

  • Some clocks have a second hand bit which also has to be perfectly aligned. This goes onto the small post coming off of the escape wheel. The second hand is a friction fit.

On a chain driven unit, it is possible to get any moon dial and remove the feet off the clock dial. The dial would then have to be attached to the wood case instead. Because there are no winding arbors on a chain driven unit there are no holes in the dial to line up. There is also rarely a second hand bit. So you could use any dial with no winding holes and attach it to the wood case. However, one thing to mention is that the moon phase will most likely no longer spin.

The content of this website is copyright by Clockworks and written by James Stoudenmire

Removing Mechanical Clock Hands

Removing Mechanical Clock Hands is fast and easy to do. The following are instructions for German mechanical movements post WW2 hand removal.

German Post WW2 wall, mantle and floor models

Turn the hand nut to the left while holding the minute hand with your fingers. Some small needle nose pliers may be needed to loosen the nut first. Once the nut is loose, you can turn it with your fingers until it comes off. The minute hand will be able to wiggle straight off its square arbor and off of the clock. The hour hand is a friction fit, so just twist the hour hand back and forth and pull toward you until it comes off. If you have a second hand bit, that is only a friction also, so just grab it with your fingernails and pull toward you.

American Antique time and strike

These type of movements come in two styles. if there is a minute hand nut, the first style is the same as above. Be very careful not to lose this hand nut. They are very hard to find and replace. The second style will have a pin holding the minute hand on instead of a nut. This pin is tapered, meaning it's fat on one side and skinny on the other usually. Just grab the fat side with needle nose pliers and yank the pin out. The minute hand will fall out with a washer. Save the washer and the tapered pin for ease of reinstalling the hands.

The content of this website is copyright by Clockworks and written by James Stoudenmire

Grandfather Clock Moon Dial Installation

Grandfather clock moon dial installation is explained in this section. This is written for a new movement installation in mind. However it can be used for any post WW2 German mechanical units with issues related to the front of the movement.

The moon gear

The moon gear gets installed onto the new movement prior to the dial installation. It is only mounted with a set screw and is installed on the same tube as the hour hand. Install onto the new unit like it was on the old with the same approximate distance on the hand shaft. This will allow it to run the gears behind the clock dial therefor run the phase of the moon.

The selector switch

A selector switch is a steel arm that is about 1 to 2 inches in length with a set screw. It's purpose is to be able to select the songs or put the clock into silent mode. Install the selector switch on the arm coming out of the clock movement's right hand side. The selector switch is installed by sliding it over the larger arm and secured with the set screw. It only has to be able to come through the slot at 3 o'clock for the user to move it up or down.

Grandfather clock moon dial installation

The clock moon dial has four posts on the back that lock into the front plate of the movement. Line up the clock hand shaft to the hole in the center of the dial and then line up the posts with the holes in the movement. There are two ways to secure the four dial posts to the clock movement. One way has locking arms on the back of the front plate of the movement that slide over the end of the dial post to lock it tight. This is if both the dial and the movement are made this way. The other way this is done is if there are holes in the ends of the dial post feet that gets a pin to secure it to the movement. A included tapered pin will go through the hole in the post after it's on the movement's front plate.

The content of this website is copyright by Clockworks and written by James Stoudenmire

Clock Moon Dial History

The phase of the moon is still popular on modern mechanical clock movements. It is interesting to know why and when this started becoming a popular feature to add to grandfather clocks.

Why it started

In the late 1600's traveling took awhile and was also hazardous at night when it was dark. The people would depend on the light of the moon to see what they are doing when they were out. The phase of the moon function was added to the floor clocks for this purpose. People could make travel plans with the moon light helping them to see.

Developments

In the 1700's clocks started to have the hump on the top of the clock dial for the moon phase. The arched dial was able to accommodate the lunar display disk. The moon was painted on the disk and the disk would rotate once a month. It was a simple and practical addition to the clock.

Alternate Animations

Some clock dials with the arch were produced with alternate animations besides the moon phase. Rocking ships and jumping deer figures among other things would rock back and forth. These animations did not have any practical functionality as the phase of the moon did. It was a simple design and was connected to the pendulum motion. If the pendulum move, the animation would rock, they were connected.

That is the history of the clock moon dial in its simplest form. Interesting how people lived and relied so heavily on there clocks back then. In the days of outhouses and traveling with horse and buggy, a clock was an important appliance.

The content of this website is copyright by Clockworks and written by James Stoudenmire

1151-053 Grandmother Clock Moon-Dial

This 9 7/8 x 13 inch phase of the moon dial with Arabic numerals on a silver chapter ring. Fits the Hermle 1151-053 clock movement. There are 4 stand off feet on the back of this dial that attach to the clock movement itself. This low arch moon dial is a uncommon size and hard to offer sometimes for this movement.

1161-853 Grandfather Clock Dial

Moon DialsMoon Dial OrderingRemoving the HandsMoon Dial InstallationMoon Dial History

Please view these information tabs to help with Grandfather Clock Moon Dials.

Grandfather Clock Moon Dial Ordering

Before ordering the new moon dial for the grandfather clock, this section must be read. Not all moon dials fit all clocks, each one is made for a specific clock movement. The reason is most moon dials have four feet, or posts, that stick out the back of the dial. These feet have to lock into the movement its being attached too. If the feet are in different locations, it will not lock into the movement. They must be married together so to speak. These grandfather clock moon dials are for post WW2 clocks only.

How to get the right moon dial

To get the correct moon dial for your clock, you will need the movement numbers. This will be directly off of the back plate of the movement itself. It will not be on any of the paperwork that came with the clock, or on the wood case. Movement numbers can only be found on the clockworks itself. With the movement numbers you can match up the number with the numbers posted on the moon dial description.

What has to match

  • The posts on the back of the dial need to lock into the movement. A hand shaft that is long on the movement, will require longer posts. In other words, the posts on the back of the dial make it so the hand shaft will stick out far enough to put the clock hands on.
  • If the movement is cable driven, the holes to wind the clock need to be in the right spot. This is important for when you put the key crank in. If it is aligned correctly, it will go onto the winding arbor of the movement. When it is not aligned properly, winding will be difficult or impossible.

  • Some clocks have a second hand bit which also has to be perfectly aligned. This goes onto the small post coming off of the escape wheel. The second hand is a friction fit.

On a chain driven unit, it is possible to get any moon dial and remove the feet off the clock dial. The dial would then have to be attached to the wood case instead. Because there are no winding arbors on a chain driven unit there are no holes in the dial to line up. There is also rarely a second hand bit. So you could use any dial with no winding holes and attach it to the wood case. However, one thing to mention is that the moon phase will most likely no longer spin.

The content of this website is copyright by Clockworks and written by James Stoudenmire

Removing Mechanical Clock Hands

Removing Mechanical Clock Hands is fast and easy to do. The following are instructions for German mechanical movements post WW2 hand removal.

German Post WW2 wall, mantle and floor models

Turn the hand nut to the left while holding the minute hand with your fingers. Some small needle nose pliers may be needed to loosen the nut first. Once the nut is loose, you can turn it with your fingers until it comes off. The minute hand will be able to wiggle straight off its square arbor and off of the clock. The hour hand is a friction fit, so just twist the hour hand back and forth and pull toward you until it comes off. If you have a second hand bit, that is only a friction also, so just grab it with your fingernails and pull toward you.

American Antique time and strike

These type of movements come in two styles. if there is a minute hand nut, the first style is the same as above. Be very careful not to lose this hand nut. They are very hard to find and replace. The second style will have a pin holding the minute hand on instead of a nut. This pin is tapered, meaning it's fat on one side and skinny on the other usually. Just grab the fat side with needle nose pliers and yank the pin out. The minute hand will fall out with a washer. Save the washer and the tapered pin for ease of reinstalling the hands.

The content of this website is copyright by Clockworks and written by James Stoudenmire

Grandfather Clock Moon Dial Installation

Grandfather clock moon dial installation is explained in this section. This is written for a new movement installation in mind. However it can be used for any post WW2 German mechanical units with issues related to the front of the movement.

The moon gear

The moon gear gets installed onto the new movement prior to the dial installation. It is only mounted with a set screw and is installed on the same tube as the hour hand. Install onto the new unit like it was on the old with the same approximate distance on the hand shaft. This will allow it to run the gears behind the clock dial therefor run the phase of the moon.

The selector switch

A selector switch is a steel arm that is about 1 to 2 inches in length with a set screw. It's purpose is to be able to select the songs or put the clock into silent mode. Install the selector switch on the arm coming out of the clock movement's right hand side. The selector switch is installed by sliding it over the larger arm and secured with the set screw. It only has to be able to come through the slot at 3 o'clock for the user to move it up or down.

Grandfather clock moon dial installation

The clock moon dial has four posts on the back that lock into the front plate of the movement. Line up the clock hand shaft to the hole in the center of the dial and then line up the posts with the holes in the movement. There are two ways to secure the four dial posts to the clock movement. One way has locking arms on the back of the front plate of the movement that slide over the end of the dial post to lock it tight. This is if both the dial and the movement are made this way. The other way this is done is if there are holes in the ends of the dial post feet that gets a pin to secure it to the movement. A included tapered pin will go through the hole in the post after it's on the movement's front plate.

The content of this website is copyright by Clockworks and written by James Stoudenmire

Clock Moon Dial History

The phase of the moon is still popular on modern mechanical clock movements. It is interesting to know why and when this started becoming a popular feature to add to grandfather clocks.

Why it started

In the late 1600's traveling took awhile and was also hazardous at night when it was dark. The people would depend on the light of the moon to see what they are doing when they were out. The phase of the moon function was added to the floor clocks for this purpose. People could make travel plans with the moon light helping them to see.

Developments

In the 1700's clocks started to have the hump on the top of the clock dial for the moon phase. The arched dial was able to accommodate the lunar display disk. The moon was painted on the disk and the disk would rotate once a month. It was a simple and practical addition to the clock.

Alternate Animations

Some clock dials with the arch were produced with alternate animations besides the moon phase. Rocking ships and jumping deer figures among other things would rock back and forth. These animations did not have any practical functionality as the phase of the moon did. It was a simple design and was connected to the pendulum motion. If the pendulum move, the animation would rock, they were connected.

That is the history of the clock moon dial in its simplest form. Interesting how people lived and relied so heavily on there clocks back then. In the days of outhouses and traveling with horse and buggy, a clock was an important appliance.

The content of this website is copyright by Clockworks and written by James Stoudenmire

1161-853 Grandfather Clock Dial

A grandfather clock moon-dial that is 11 x 15 1/2 inches and made for the Hermle 1161-853 movement. The dial has Arabic numerals on a silver chapter ring and raised decorations throughout. This dial fits certain Hermle movements and has a 10 inch time track diameter. The four dial feet on the back of the dial mount into the movement itself.

Twisted Rod Lyre Pendulum

Twisted rod Lyre style grandfather clock pendulum for large Hermle 114cm floor clocks. This is a mechanical clock pendulum than can be used for a quartz conversion also. The pendulum is 44 inches long and the pendulum bob is 10 5/8 wide.

Floor Clock Moon Dial For Grandfather Clocks

Moon DialsMoon Dial OrderingRemoving the HandsMoon Dial InstallationMoon Dial History

Please view these information tabs to help with Grandfather Clock Moon Dials.

Grandfather Clock Moon Dial Ordering

Before ordering the new moon dial for the grandfather clock, this section must be read. Not all moon dials fit all clocks, each one is made for a specific clock movement. The reason is most moon dials have four feet, or posts, that stick out the back of the dial. These feet have to lock into the movement its being attached too. If the feet are in different locations, it will not lock into the movement. They must be married together so to speak. These grandfather clock moon dials are for post WW2 clocks only.

How to get the right moon dial

To get the correct moon dial for your clock, you will need the movement numbers. This will be directly off of the back plate of the movement itself. It will not be on any of the paperwork that came with the clock, or on the wood case. Movement numbers can only be found on the clockworks itself. With the movement numbers you can match up the number with the numbers posted on the moon dial description.

What has to match

  • The posts on the back of the dial need to lock into the movement. A hand shaft that is long on the movement, will require longer posts. In other words, the posts on the back of the dial make it so the hand shaft will stick out far enough to put the clock hands on.
  • If the movement is cable driven, the holes to wind the clock need to be in the right spot. This is important for when you put the key crank in. If it is aligned correctly, it will go onto the winding arbor of the movement. When it is not aligned properly, winding will be difficult or impossible.

  • Some clocks have a second hand bit which also has to be perfectly aligned. This goes onto the small post coming off of the escape wheel. The second hand is a friction fit.

On a chain driven unit, it is possible to get any moon dial and remove the feet off the clock dial. The dial would then have to be attached to the wood case instead. Because there are no winding arbors on a chain driven unit there are no holes in the dial to line up. There is also rarely a second hand bit. So you could use any dial with no winding holes and attach it to the wood case. However, one thing to mention is that the moon phase will most likely no longer spin.

The content of this website is copyright by Clockworks and written by James Stoudenmire

Removing Mechanical Clock Hands

Removing Mechanical Clock Hands is fast and easy to do. The following are instructions for German mechanical movements post WW2 hand removal.

German Post WW2 wall, mantle and floor models

Turn the hand nut to the left while holding the minute hand with your fingers. Some small needle nose pliers may be needed to loosen the nut first. Once the nut is loose, you can turn it with your fingers until it comes off. The minute hand will be able to wiggle straight off its square arbor and off of the clock. The hour hand is a friction fit, so just twist the hour hand back and forth and pull toward you until it comes off. If you have a second hand bit, that is only a friction also, so just grab it with your fingernails and pull toward you.

American Antique time and strike

These type of movements come in two styles. if there is a minute hand nut, the first style is the same as above. Be very careful not to lose this hand nut. They are very hard to find and replace. The second style will have a pin holding the minute hand on instead of a nut. This pin is tapered, meaning it's fat on one side and skinny on the other usually. Just grab the fat side with needle nose pliers and yank the pin out. The minute hand will fall out with a washer. Save the washer and the tapered pin for ease of reinstalling the hands.

The content of this website is copyright by Clockworks and written by James Stoudenmire

Grandfather Clock Moon Dial Installation

Grandfather clock moon dial installation is explained in this section. This is written for a new movement installation in mind. However it can be used for any post WW2 German mechanical units with issues related to the front of the movement.

The moon gear

The moon gear gets installed onto the new movement prior to the dial installation. It is only mounted with a set screw and is installed on the same tube as the hour hand. Install onto the new unit like it was on the old with the same approximate distance on the hand shaft. This will allow it to run the gears behind the clock dial therefor run the phase of the moon.

The selector switch

A selector switch is a steel arm that is about 1 to 2 inches in length with a set screw. It's purpose is to be able to select the songs or put the clock into silent mode. Install the selector switch on the arm coming out of the clock movement's right hand side. The selector switch is installed by sliding it over the larger arm and secured with the set screw. It only has to be able to come through the slot at 3 o'clock for the user to move it up or down.

Grandfather clock moon dial installation

The clock moon dial has four posts on the back that lock into the front plate of the movement. Line up the clock hand shaft to the hole in the center of the dial and then line up the posts with the holes in the movement. There are two ways to secure the four dial posts to the clock movement. One way has locking arms on the back of the front plate of the movement that slide over the end of the dial post to lock it tight. This is if both the dial and the movement are made this way. The other way this is done is if there are holes in the ends of the dial post feet that gets a pin to secure it to the movement. A included tapered pin will go through the hole in the post after it's on the movement's front plate.

The content of this website is copyright by Clockworks and written by James Stoudenmire

Clock Moon Dial History

The phase of the moon is still popular on modern mechanical clock movements. It is interesting to know why and when this started becoming a popular feature to add to grandfather clocks.

Why it started

In the late 1600's traveling took awhile and was also hazardous at night when it was dark. The people would depend on the light of the moon to see what they are doing when they were out. The phase of the moon function was added to the floor clocks for this purpose. People could make travel plans with the moon light helping them to see.

Developments

In the 1700's clocks started to have the hump on the top of the clock dial for the moon phase. The arched dial was able to accommodate the lunar display disk. The moon was painted on the disk and the disk would rotate once a month. It was a simple and practical addition to the clock.

Alternate Animations

Some clock dials with the arch were produced with alternate animations besides the moon phase. Rocking ships and jumping deer figures among other things would rock back and forth. These animations did not have any practical functionality as the phase of the moon did. It was a simple design and was connected to the pendulum motion. If the pendulum move, the animation would rock, they were connected.

That is the history of the clock moon dial in its simplest form. Interesting how people lived and relied so heavily on there clocks back then. In the days of outhouses and traveling with horse and buggy, a clock was an important appliance.

The content of this website is copyright by Clockworks and written by James Stoudenmire

Floor Clock Moon Dial

For floor clocks, this moon dial is 11 x 15 1/2 with Arabic numerals on a silver chapter ring. The four dial feet on the back of the dial mount into the movement itself. Has the silent / chime option at 3 O'clock as well as the three song selections. This dial is available to fit a variety of floor clock movements made by Hermle or Kieninger.

Jauch Wood Stick Clock Pendulum

The wood stick will come unstained. This is so the stick can be stained the proper color to match the clock case. The wood stick pendulum consists of the stick with the hardware and also the bob in the diameter chosen. The good thing about wood stick pendulums is they can be shortened if needed.

Straight Rod Lyre Pendulum

This 34 inch long lyre pendulum has rods and has a 6 5/8 wide pendulum bob. This is usually sold for Hermle floor clock movements, but works well also with the quartz conversion kit.

Quartz Conversion Grandfather Clock Moon Dial

A genuine mechanical clock phase of the moon dial, that we modify to accommodate the QU40 quartz movement to fit up to it. This dial must be attached to the wood case by means of drilling four screw holes in the corner and screw it into the wood. The moon disk is for decoration and will not turn.

1161 Grandfather Clock Moon-Dial

Moon DialsMoon Dial OrderingRemoving the HandsMoon Dial InstallationMoon Dial History

Please view these information tabs to help with Grandfather Clock Moon Dials.

Grandfather Clock Moon Dial Ordering

Before ordering the new moon dial for the grandfather clock, this section must be read. Not all moon dials fit all clocks, each one is made for a specific clock movement. The reason is most moon dials have four feet, or posts, that stick out the back of the dial. These feet have to lock into the movement its being attached too. If the feet are in different locations, it will not lock into the movement. They must be married together so to speak. These grandfather clock moon dials are for post WW2 clocks only.

How to get the right moon dial

To get the correct moon dial for your clock, you will need the movement numbers. This will be directly off of the back plate of the movement itself. It will not be on any of the paperwork that came with the clock, or on the wood case. Movement numbers can only be found on the clockworks itself. With the movement numbers you can match up the number with the numbers posted on the moon dial description.

What has to match

  • The posts on the back of the dial need to lock into the movement. A hand shaft that is long on the movement, will require longer posts. In other words, the posts on the back of the dial make it so the hand shaft will stick out far enough to put the clock hands on.
  • If the movement is cable driven, the holes to wind the clock need to be in the right spot. This is important for when you put the key crank in. If it is aligned correctly, it will go onto the winding arbor of the movement. When it is not aligned properly, winding will be difficult or impossible.

  • Some clocks have a second hand bit which also has to be perfectly aligned. This goes onto the small post coming off of the escape wheel. The second hand is a friction fit.

On a chain driven unit, it is possible to get any moon dial and remove the feet off the clock dial. The dial would then have to be attached to the wood case instead. Because there are no winding arbors on a chain driven unit there are no holes in the dial to line up. There is also rarely a second hand bit. So you could use any dial with no winding holes and attach it to the wood case. However, one thing to mention is that the moon phase will most likely no longer spin.

The content of this website is copyright by Clockworks and written by James Stoudenmire

Removing Mechanical Clock Hands

Removing Mechanical Clock Hands is fast and easy to do. The following are instructions for German mechanical movements post WW2 hand removal.

German Post WW2 wall, mantle and floor models

Turn the hand nut to the left while holding the minute hand with your fingers. Some small needle nose pliers may be needed to loosen the nut first. Once the nut is loose, you can turn it with your fingers until it comes off. The minute hand will be able to wiggle straight off its square arbor and off of the clock. The hour hand is a friction fit, so just twist the hour hand back and forth and pull toward you until it comes off. If you have a second hand bit, that is only a friction also, so just grab it with your fingernails and pull toward you.

American Antique time and strike

These type of movements come in two styles. if there is a minute hand nut, the first style is the same as above. Be very careful not to lose this hand nut. They are very hard to find and replace. The second style will have a pin holding the minute hand on instead of a nut. This pin is tapered, meaning it's fat on one side and skinny on the other usually. Just grab the fat side with needle nose pliers and yank the pin out. The minute hand will fall out with a washer. Save the washer and the tapered pin for ease of reinstalling the hands.

The content of this website is copyright by Clockworks and written by James Stoudenmire

Grandfather Clock Moon Dial Installation

Grandfather clock moon dial installation is explained in this section. This is written for a new movement installation in mind. However it can be used for any post WW2 German mechanical units with issues related to the front of the movement.

The moon gear

The moon gear gets installed onto the new movement prior to the dial installation. It is only mounted with a set screw and is installed on the same tube as the hour hand. Install onto the new unit like it was on the old with the same approximate distance on the hand shaft. This will allow it to run the gears behind the clock dial therefor run the phase of the moon.

The selector switch

A selector switch is a steel arm that is about 1 to 2 inches in length with a set screw. It's purpose is to be able to select the songs or put the clock into silent mode. Install the selector switch on the arm coming out of the clock movement's right hand side. The selector switch is installed by sliding it over the larger arm and secured with the set screw. It only has to be able to come through the slot at 3 o'clock for the user to move it up or down.

Grandfather clock moon dial installation

The clock moon dial has four posts on the back that lock into the front plate of the movement. Line up the clock hand shaft to the hole in the center of the dial and then line up the posts with the holes in the movement. There are two ways to secure the four dial posts to the clock movement. One way has locking arms on the back of the front plate of the movement that slide over the end of the dial post to lock it tight. This is if both the dial and the movement are made this way. The other way this is done is if there are holes in the ends of the dial post feet that gets a pin to secure it to the movement. A included tapered pin will go through the hole in the post after it's on the movement's front plate.

The content of this website is copyright by Clockworks and written by James Stoudenmire

Clock Moon Dial History

The phase of the moon is still popular on modern mechanical clock movements. It is interesting to know why and when this started becoming a popular feature to add to grandfather clocks.

Why it started

In the late 1600's traveling took awhile and was also hazardous at night when it was dark. The people would depend on the light of the moon to see what they are doing when they were out. The phase of the moon function was added to the floor clocks for this purpose. People could make travel plans with the moon light helping them to see.

Developments

In the 1700's clocks started to have the hump on the top of the clock dial for the moon phase. The arched dial was able to accommodate the lunar display disk. The moon was painted on the disk and the disk would rotate once a month. It was a simple and practical addition to the clock.

Alternate Animations

Some clock dials with the arch were produced with alternate animations besides the moon phase. Rocking ships and jumping deer figures among other things would rock back and forth. These animations did not have any practical functionality as the phase of the moon did. It was a simple design and was connected to the pendulum motion. If the pendulum move, the animation would rock, they were connected.

That is the history of the clock moon dial in its simplest form. Interesting how people lived and relied so heavily on there clocks back then. In the days of outhouses and traveling with horse and buggy, a clock was an important appliance.

The content of this website is copyright by Clockworks and written by James Stoudenmire

1161 Grandfather Clock Moon-Dial

A grandfather clock moon-dial that is 11 x 15 1/2 inches for the 1161 movement. The dial has Arabic numerals on a silver chapter ring and raised decorations. This dial fits certain Hermle movements and has a 10 inch time track diameter. The four dial feet on the back of the dial mount into the movement itself. Fits two movements, the Hermle 1161-853 or Hermle 1161-850.