Anyone have data for the lift angles on the various newer coaxial movements? I found info on the older 2500 (38degrees) but nothing on the newer 8XXX calibres.

Any help is much appreciated!

 

All of the 8XXX movements, with the exception of 8806 and 8807, are 38 degrees. The 8806 and 8807 are 36 degrees.

Note that unless you have a timing machine that has additional programs that are made specifically for measuring co-axial movements, the amplitude readings will not be reliable even if the lift angle is set to the correct number. Many cheap machines are sold as being able to "measure co-axial watches" and they can for the rate, but not for the amplitude.

Cheers, Al

 

Thanks Al! Can always count on you for great information!

 

So, my curiosity is getting the better of my: why do you want to know the lift angles?

 

You need it to calculate the amplitude.

The timing machine is listening to the ticks of the watch. The only things you can identify with the sound are
- the beats (rate)
- the difference between clockwise beat and counterclockwise beat (beat error)
- the time between entry and release of the pin.

Now, with the lift angle and because the mechanism of a watch is (nearly) isochronous, you can also calculate the amplitude. The smaller the entry-release time, the bigger the amplitude.

 

Interesting. Learn something everyday, and it almost makes sense to me now after a few years of study.

 

Anyone know the lift angle of the 9900

 

38 degrees - again unless you have a machine with programming for co-axial calibers specifically, you will not get the correct amplitudes.

 

Archer, excuse me if this is an amateurish question… but can cheap timegraphers accurately gauge a co-axial movement’s beat error?

Because I get wild readings on beat error with my two co-axial Omegas, versus a low and steady reading with some ETAs and Seikos. Thanks!

 

Other than amplitude of the balance, the rest should be fine.

 

What’s the minimum timegrapher machine needed to accurately measure co-axial caliber amplitudes?

 

Something like this...

Watch Expert (G4) – Witschi

 

Thanks! I guess I will start saving my pennies! Whats a typical amplitude for a caliber 89XX movement?

 

Thank you very much for your great help.

 

I've forgot it sorry dear Archer bit I have to thank you so mutch. I'm a Hobbywatchmaker beginner. You mist laught about me but in my free time & I have mot lot. I gave & give my best for wirstwatchmaker studies because ❤️ Omega wirstwatches & many otherer Brands. Have a nice day with yours & I wish the same for the entire Omega Forum membres and Greetings from me. OmegaFan1959

 

Could the Timegrapher app on an iphone read the amplitude correctly?

 

Most of the phone apps I have tried can't even read the rate properly so I would assume not.