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 lift angle; I did the math for this.

Kevin

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Lift angle for the caliber 924 in the JLC Master Calendar

By: Kevin C : October 22nd, 2012-15:29

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

By: ei8htohms : October 22nd, 2012-17:57

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

By: BluNotte : October 23rd, 2012-17:31

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

By: ei8htohms : October 24th, 2012-18:56

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

By: Kevin C : October 24th, 2012-14:58

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...

By: ei8htohms : October 24th, 2012-19:01

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 . . .

By: Dr No : October 25th, 2012-15:14

. . . 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

By: ei8htohms : October 25th, 2012-17:05

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

Most people used a screwdriver to adjust the idle,

By: cazalea : October 26th, 2012-19:54

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...