pendulum length for a jauch 77 clock

2 ANSWERS

1. amomipais82
   

   Hi,
   Professional clockmakers will not attempt to do this because the customer would not want to pay for the labor required to complete one of these "project".  When I started out in the business, I tried doing it and ceased when additional problems would require callbacks.  Lost revenue on a lot of those!
   
   And let me explain what Emperor (a subsidiary of Hermle)is up against.  I worked and retired from a (THE) large computer company.  As new technology was offered, there was very little trade-in value on products that were becoming obsolete.  As a result, some customers would keep using their original equipment or donate it to organizations as a charity.  When technical or operational support was needed, it was not available and they would get upset.  Can you imagine a company hiring new personnel to support every new technology and retain the existing ones to stay with the old?  They wouldn't have enough room to hold them, much less pay them!  That's the way it is with technology.  So, Emperor (Hermle) has the same situation.  At least they do offer a conversion kit available to resolve the "old technology".

   Report (0) (0)  |   12 years, 8 month(s) ago  

2. Guest1997
   

   I can give you pendulum lengths, but first I would like to offer an alternative answer to the one by, I believe by Ali Abdullah.  I also worked for (THE) large computer company (it could be the same one as Ali) and I have to totally agree with the technology delima as far as having to discontinue support for old products.  However, clocks are a little different.  There are many clocks in the world that are still being serviced.  The oldest I have worked on that I know of was made in 1728.  Many of the original clock movement companies have gone out of business.  However, movements all follow similar designs and function and can still be serviced by experienced clockmakers (unfortunately clocknakers are not plentiful).  The Jauch clock company one of those that is out of business.  There is a history of some excessive wear on a majority of the referenced movement, but the movements are still be serviced.  And it is correct in that Hermle offers conversion kits for movements that are too costly to restore.  I, and other clockmakers also have these conversion kits.
   
   In answer to the pendulum length for a Jauch 77 movement, I need to point out that it depends on the pendulum configuration.  Most of the modern production clock movements are identified by a pendulum length designation like, for floor clocks, 94cm, 110cm, 114cm and 116cm.  This is not the actual pendulum length but the theoretical length of a "perfect" pendulum.  For the Jauch 77, a wood stick pendulum with a 4-1/2" round bob has a length of approximately 76cm or 30".  This is measured from the top hook of the pendulum to the bottom of the bob.  A  metal rod lyre pendulum has a length of approximately 84.5cm or 33-1/4".  This is because the additional mass in the upper part of the pendulum requires that the pendulum bob be lower to compensate for this redistribution of the center of mass.  This center of mass is what regulates the regulation or timing of the clock.  Even a suspension spring of a different thickness will require the pendulum length adjustment to be changed.  I hope this helps clear some things up a little.
   
   John Newman
   The Village Clocksmith
   Old Prattvillage
   Prattville, AL
   klokdok@juno.com

   Report (0) (0)  |   12 years, 8 month(s) ago