Balance wheel beat adjustment--unfriendly collet

[mikepilk]

18 minutes ago, JohnR725 said:

But on some watches Older watches in particular you might find a little tiny dot On the balance rim. Is there to tell you where the stud is supposed to be. 

 

I always look for the dot on the balance rim. 

As I only service my own watches, for any without adjustable stud holders, I accept anything less than about 2ms beat error. You can mess about for ages trying to get it right. And each adjustment risks damaging the hairspring. I just make a note to give it a tweak at the next service.

The example I show above of the 5 deg angular error - if the impulse jewel were at 2 mm from the pivot (probably less), then a 1m/s beat error equals about 0.17mm lateral position error in the jewel.

Edited December 17, 2021 by mikepilk