Hermle Lyre Pendulum

September 19, 2018 11:36 am Published by Leave your thoughts

$89.89$149.89

Lyre pendulum for a mechanical Hermle clock movement.

Please see instructions below to know how to order the proper pendulum.

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.

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H-L-Pend: $89.89$149.89

Identification

Hermle clock movement identification

How to order

You will need CM number off of the Hermle clock movement itself. Not off the paper work, not off the wood case. It will say a number such as 94CM or 114CM, some number followed by CM (centimeters).

Measuring note = The Germans measure there pendulum length from the TOP of the movement and all the way down to the very bottom of the pendulum rating nut threads. This could make things confusing for the customer and also this measurements varys drastically depending on the bob diameter. So the length can be tricky but lucky for you, you do not need to know all this. If your clock says something like 94cm, just choose 94cm from the list with your desired bob diameter, and we will take care of the length. The reason why this is explained here, is sometimes a customer gets the pendulum and measures it, and says "hey this pendulum does not measure 94CM and therefore it is wrong" but this is not the situation. A pendulum FOR a Hermle 94cm movement, does not mean you will get a 94cm long pendulum, it will be shorter.

Bob note = If you do not have a pendulum your replacing and its lost, we need to also figure out what bob diameter will swing around inside the case without hitting the sides. Usually people want the largest bob diameter they can get without it hitting the sides of the case. So how we figure this out is to measure how wide the inside of the clock is where the pendulum will swing. You now have some measurement like 14.5 inches or something, we deduct 4 inches from this number = 6 1/2 inches is the widest bob diameter you would want to get. You can get whatever is smaller, but dont go larger. For example you do not want a 8 1/2 inch bob because it will hit the sides, but you can use a 5 1/2 inch or 6 1/2 inch bob just fine.

Here are the steps to order the pendulum =

  • 1. Know your movement is made by Hermle by seeing above movement number examples.
  • 2. Get the CM numbers off of the back plate of the movement itself.
  • 3. Determine the bob diameter needed by measuring how wide the inside of the case is and then subtracting 4 inches.
  • 4. Decide if you want a Metal fancy Lyre style pendulum, or a Wood stick pendulum, or a brass rod pendulum if the option is there. They all come with a brass round bob at the bottom in the diameter you choose, but what it hangs on can be any of those mentioned (lyre, stick, brass rod.)
  • 5. Order it
  • When you get your pendulum you will need to put your clock in beat for it to run. This is very easy.

    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.

How to put a pendulum clock in beat

Every mechanical clock that has a pendulum needs to be in beat to function. Its part of owning the clock, is the learn this. If you do not know how to do this whenever you move the clock from here to there it will stop after 5 - 10 minutes. Putting the clock in beat is very easy.

How to put a German mechanical clock in BEAT ? (Post 1950)

This is done on Modern German clocks by pushing the pendulum all the way to one side (doesn’t matter right or left) to go beyond its resistance, and then letting it go. Now listen to see if the tick and the tock are evenly spaced. If it is stick going ticktock ticktock, or even tocktick tocktick then it is not in beat and will stop after 5min to an hour. Repeat the process above of pulling the pendulum all the way to one side and letting it go. The clock should have a nice, steady, rhythmic tick-tock, tick-tock with equal time lapsing between the tick and the tock and the next tick.

Sometimes when there is not much room to swing the pendulum in the clock case, as there is a big round pendulum bob and the case is not wide, you will need to adjust the beat in a different way. This is also true on some movements that the beat will not automatically set when swinging the pendulum wide. You would adjust the beat by pushing the top of the pendulum left or right as it hangs in its clock case, just hold a lower portion of the pendulum with your left hand as you push the top of the pendulum left or right with your right hand. You will feel the freedom in the pendulum to move left or right, with some resistance at the sides at the end of your left or right travel. You are changing the beat of the clock when you go beyond this resistance and therefore changing the place of the freedom area. Don’t be afraid to move this pendulum top as there is nothing to break as you go left or right beyond the resistance on the sides of the swing.

Bottom mount westminster clock chime block

Putting it in beat

Bottom mount westminster clock chime block

Your adjusting these

Bottom mount westminster clock chime block

Crutch being called anchor arm

Bottom mount westminster clock chime block

Leader being called suspension arm

Notes

The beat is the rhythmic pulsations of the escape wheel clicking over one tooth at a time, and this results in the sound tick / tock. What drives the pendulum is the escapement. They call it an escapement because its just letting the power of the gear train escape one tooth at a time. This make the sound tick and tock. That tick or tock sends a jumping pulse action to what is known as a crutch and that wacks the pendulum slightly each swing. The pendulums momentum back and forth, with being wacked by the crutch that comes down a little, just keeps it going and going. Provided its even left and right, in other words the tick and tock are even.

At this point, you have the movement in the clock with the dial off still. You have the movement running good. Now its time to make it chime and strike.

Additional information

Weight 2 lbs
CM Length

75cm, 85cm, 94cm, 100cm, 114cm

Bob Diameter

5 1/2 Inch, 6 1/2 Inch, 8 1/2 Inch, 10 1/2 Inch