WatchTech

Hi, I recently purchased a timing machine for my watch collection and I was wondering if anyone here might know the lift angle for the 924 caliber contained in the JLC Master Calendar watch. My timing machine required an accurate lift angle as an input to... 

If you're off by a degree or two in lift angle it won't make your amplitude readings off by more than 5 or 10 degrees anyway. _john

John, WOuld you care to enlighten me once again on what exactly would be the definition of "Lift Angle"? It's one of the things that i still dont quite get despite reading alot about it! Thanks! Stephen

Hi BluNotte, I think it would be more descriptive to call it the angle of engagement, as that is really what it is. It's the portion of the arc of the balance swing within which the roller jewel is engaged with the pallet fork. The angle includes the unlo... 

Thanks John, I thought there was a pretty good chance of it being between 48 and 52. I tried to get this directly from JLC, but they would not give it to me. I agree with the approximately 6 degrees error for amplitude for every error of 1 deg for the lif... 

The one you're looking for is not in here, but lots more are: #gid=0 I've stopped using these types of reference lists entirely after training myself to estimate amplitude by eye and then setting the lift angle on the timing machine accordingly. This is q... 

. . . weren't aware of how special that level of skill is, I'm impressed, and mightily. Reminds me of the days when I adjusted the idle on a carburetor by ear.

Goes from seemingly impossible to routine in no time. :-) _john

doing it by ear must have been a sight to see! Hope your hair was shorter ... Sorry Art, I could not resist. I've usually set idle, mixture and timing that way - after decades of practice though. It hadn't occurred to me that a watchmaker would develop th...