Hermle Clock Pendulum Measuring

Posted on    Posted in  turned_in_not  130 / 131 Series

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, measure all of the components of the pendulum. 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 Clockworks in order to determine the best pendulum length. Please provide the Hermle clock pendulum 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.

Hermle Clock Pendulum Measuring - Parts that are measured

The Hermle clock 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 Hermle clock pendulum 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 in year 2020

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Wayne Stiles
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Wayne Stiles

I’m replacing a Hermle 241-080 94cm. The old pendulum leader is 1″ longer than the replacement movement’s. The old leader is not configured so as to fit over the L-shaped movement arm. The new leader is not flat, its oddly shaped and much be fed through a narrow slot and then hung from upper post. Will shorter pendulum cause new movement to run too fast? If so, what can be done.
Hope this reaches someone. Thanks.

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