Hermle wood-stick clock pendulum

September 19, 2018 11:36 am Published by 3 Comments


Stick Pendulum for Hermle Clocks

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) .

H-WS-PEND: $35.00$55.00
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 a 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 almost 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 the specific clock movement upon 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.


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 hook will mount 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 a full timing adjustment range all over again and can go up or down as needed.

German pendulum length CM stamp

The pendulum length is considered overall and not just the pendulum. These German units measure there pendulum lengths from the top of the movement and all the way down. This will include the suspension spring, the leader and also the pendulum itself. This is based on a 4 1/2 inch bob diameter. Of course the larger the bob, the longer it will be beyond that CM stamp 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 movement restoration is the only option. The movement can be shipped to Clockworks.com Attn Repair department for a beautiful restoration.

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.

Additional information

Weight 2 lbs
CM Length

31cm, 32cm, 33.5cm, 35cm, 37cm, 38cm, 43cm, 45cm, 48cm, 55cm, 66cm, 75cm, 85cm, 94cm, 114cm

Bob Diameter

3.25 Inch, 4 inch, 4.5 Inch, 5.5 Inch, 6.5 Inch

Ask a Clock Question

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George Weller

We have a Tempus Fugit Grandmother we think of German design with the Following identification on the cabinet 451-1050 Germany 75cm 75833
I have selected a 75 cm with a 4.5 bob. Can you confirm this would be correct for this clock, if so can you give me a total price for purchase and shipping to the UK Thank You