HERMLI MOVEMENT 1161-053h 94cm

Discussion in 'Clock Repair' started by sparkey0151, Sep 12, 2017.

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  1. sparkey0151

    sparkey0151 Registered User
    NAWCC Member Donor

    Aug 9, 2016
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    Hi just wondering can anybody give me a simple answer to the length of a pendulum, the HERMLI movement is a 1161-053h and it states 94cm is this the length of the pendulum tip to tip of screw thread ? with a 6" bob.



    regards john
     
  2. Willie X

    Willie X Registered User

    Feb 9, 2008
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    #2 Willie X, Sep 12, 2017
    Last edited: Sep 12, 2017
    If you are buying a replacement pendulum a Hermle 94cm pendulum should work. If you are making a pendulum, make a trial pendulum first by taping the desired pendulum bob on the desired stick. When you get the clock to keep time, cut the stick off. Be sure to cut the stick a couple of inches long because cutting off the extra stick will make your clock run faster. Then you will have to lower the bob a bit. The final cut should put the regulation nut near the center of the threaded rod.

    It's the same deal for any type pendulum. A wild guess on your pendulum length, from hook to tip, would be in the neighborhood of 32". This would be for a 6 1/2" plain bob with a 3/4" oval stick. Your mileage will vary.

    I wish there were a precice number to give you but pendulum length is based on a number of variables and can only be found by experiment. The ole trial and error thing. It might take you a week or two, without a beat counter, to get a good rate. Much less with a beat counter. However, with or without a beat counter, the actual work time will be about the same. And, fine adjustment will usually take several week-to-week runs.

    Good luck,
    Willie X
     
  3. sparkey0151

    sparkey0151 Registered User
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    Aug 9, 2016
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    liverpool uk
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    Thank you will, that sounds just what I wanted simple and straight to the point,

    Regards John😀
     
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