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Strange timegrapher graph


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Usually, when coils touch each other or there is banking, the rate increases. 

In your case the rate decreases. I think there is a problem with the regulator pins - the hairspring is not centered between them, or even rests on one of the regulator pins - and when the amplitude marginally increases, the equivalent HS length increases, because it will not touch the regulator pin.

 

Also try a demagnetization.

Edited by matabog
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Can you do a longer term capture? I'm only starting to dig into the timegraph troubleshooting but my initial thought is that it could be a defect in one of the train wheels? Then I guess it would happen on all positions.... hmmm... maybe debris that affects only on that position? Interesting! I hope you get to the bottom if it. Good luck!

Cheers!

 

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51 minutes ago, rodabod said:

How does the amplitude vary when the rate suddenly changes?

Good point, which I forgot to mention - the amplitude doesn't react into these drops in any way. Amplitude goes dial down around 274-278 degrees when fully wound, even if the beat drops.

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