critical pendlum weight

Posted: Wed May 14, 2008 8:56 pm     Post subject: critical pendlum weight

hi all
i am curiouse as to whether or not a 1939's or 1940's tabour clock uses
a specific weighted pendlum or is it all that criticle, ive seen a whole lot of these as mix and match sets and am curiouse since i seem to have misplaced one for a customer.

buck

Posted: Sat May 17, 2008 9:39 pm     Post subject:

No. the length of the pendulum must be right to keep time. Weightis not critical.

Posted: Sun May 18, 2008 9:50 pm     Post subject:

tnx clokfxr, thats what i needed to know.

Posted: Thu Jun 19, 2008 1:32 am     Post subject:

I think exact weight is not critical, but if pendulum is too light the clock can run faster when mainspring is full loaded and will run slower while mainspring loses power. This depends on movement quality and type of escapement.

Posted: Fri Jun 20, 2008 12:59 am     Post subject: Pendulum weight

Most American mantel clocks from the turn of the century onward had pendulum bobs weighing perhaps two or three ounces. There were a few exceptions but most of them operated with similar weight.

Posted: Fri Jun 20, 2008 1:21 pm     Post subject:

The majority of the pendulums were very close in wieght the exception that clkwrx is talking about was primarliy but not always - Seth Thomas. Certain models- sonora chime and some had very heavy bobs.

Good luck