PUW 1461 Lift Angle?

[Knebo]

On 12/25/2024 at 4:44 PM, SiZi said:

So for example this is the PUW fully wound. I am seeing an approx amplitude of 217.5. At this amplitude the lift angle is about 41. 
PUW 1461 amplitude

but here’s a Pobeda / Slava / Zim 2602 that I tried the same with. I am seeing an amplitude of 197, but this shows the lift angle to be 32 (which sounds off, no?). So I don’t know if I’m doing this right.

Pobeda 2602 amplitude

Thanks for helping, as always! 

Yes, you've done exactly as I suggested and drawn the right conclusions about the amplitude calculation.

I personally find this easier/quicker than the 180° approach. But other may prefer it. But as you saw, the calculation results are the same.

After that, the lift angle for the Pobeda is lower than the known one (42). This could also mean that someone has tampered with the escapement before you... 

 

[SiZi]

I just wanted to close the loop on this thread for the benefit of future queries... I have carefully studied the amplitude and concluded that the lift angle for the PUW 1461 is 49 degrees. You can see the video below. I played the video on my phone and placed a 360-degree protractor on the phone screen and marked out the movement of the balance wheel spokes to try and get as accurate an estimate as possible. I determined a 260-degree dial-down amplitude. I then adjusted the lift angle on the timegrapher till I achieved this amplitude, and it seems like 49 degrees is accurate. 

Timegrapher reading:

Video in super slow-mo:

This is how I did the measurement:

Edited January 2 by SiZi