Excessive amplitude, but good rate and beat error…

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M'Bob

·Sep 15, 2021

From a cal. 1863 Speedmaster. What could cause this one parameter to be off?

Edited: Sep 15, 2021

 

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Dan S

·Sep 15, 2021

I guess it could be the mainspring, or maybe something else I'm not familiar with. But as long as it's not rebanking maybe it's not an issue in practice.

 

C

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ChiefMark

·Sep 15, 2021

Do you have the lift angle set properly in the grapher?

 

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M'Bob

·Sep 15, 2021

C ChiefMark

Do you have the lift angle set properly in the grapher?

50 degrees?

 

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M'Bob

·Sep 15, 2021

Dan S

I guess it could be the mainspring, or maybe something else I'm not familiar with. But as long as it's not rebanking maybe it's not an issue in practice.

Will evidence of re-banking make itself apparent on the timegrapher?

 

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Archer

·Sep 15, 2021

M'Bob

Will evidence of re-banking make itself apparent on the timegrapher?

Yes...the rate will jump up very high, and the pattern on the screen will be all over the place.

 

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M'Bob

·Sep 15, 2021

Archer

Yes...the rate will jump up very high, and the pattern on the screen will be all over the place.

Great, thanks.

I notice the line above isn’t that smooth, if that means anything to a trained eye…

 

C

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ChiefMark

·Sep 15, 2021

M'Bob

50 degrees?

That's the number I have.