Kevin C
50
Lift angle for the caliber 924 in the JLC Master Calendar
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 calculate the amplitude of the balance wheel.
I would greatly appreciate it if anyone here would pass this information along to me.
Thanks,
Kevin
Lift angle for the caliber 924 in the JLC Master Calendar
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...
50 is probably close enough
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
Now that we're on this subject of lift angles
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
lift angle is a misleading name for it
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
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...
in case you haven't seen it...
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...
Just in case you felt we . . .
. . . 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.
very similar skill I'm sure
Goes from seemingly impossible to routine in no time. :-) _john
Most people used a screwdriver to adjust the idle,
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...