Help me understand this. I bought a timegrapher 1000 thinking it would help me with diagnostics. So I put my Elgin 390 and my Hamilton 992 on it. Both these watches keep time within seconds per week. They're both showing beat errors between 3.5 and 4.5. So I stared down the impulse jewel and they're dead center between the banking pins. So I thought ok let me put my 50's omega automatic on it. It shows .02 beat error but loses 2 min.s per day. Whats goin on here?

Robert I think with the beat error you have you could have a problem with these two could over banking.
I hope this helps

Hello Robert,

In my opinion, 3.5-4.5 milliseconds is not a significant beat error for a pocket watch. This is evidenced by the fact that both are keeping accurate time. If you wanted to get this closer to zero ms you would need to remove the balance and turn the hairspring collet a small fraction of a degree one way or the other, reinstall the balance and re check. This could take a long time and you'd probably never get as close as 0.5ms .....let alone zero. When I was repairing RR pocket watches, I mostly set equal beat visually.

William

I guess I'll leave well enough alone. Thanks for the insight

This is a good video about beat correction

https://www.youtube.com/watch?v=C9tOHiPQpbw

This is an excellent video!

William