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Beat Error and Positional Error


Assuming the hairspring is sitting correctly in the regulator pins, is flat, correctly coiled and clean.  The balance has been correctly lubed and pivots/jewels are all ok, and it is poised ok.  The timegrapher is set correctly for lift angle, beat rate etc   .I appreciate that the quality of the movement and lack of wear etc are important but assume that these are at acceptable levels.

What effect will beat error have, if any, on the positional timing?   Is there a target beat error range that should be aimed at for good positional error?

Your esteemed comments would be much appreciated.



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dito, both are not connected.

Beat error is a big topic in communities, but is highly overestimated, it has little to no influence on the performannce.

If displayed as "ms" like with most TMs, this value is a vague indicator only: the identical beat error (i.e. the angle that the balance impulse jewel is off the middle line, with no mainspring power applied) will show different "ms" values, depending on 1) beat rate and 2) amplitude.

So you can say ">1ms is bad, <1ms is fine", but it is nonsense without stating amplitude and beat rate, which nobody does. The only exact value is beat error in degrees!




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Frank is right, I should have maybe mentioned that I almost always work with 18000bph watches. It's still handy to have a ballpark figure for what sounds reasonable. For example, if you are getting a reading of 9mS then it's probably advisable to adjust. I would only make any adjustments when the amplitude is healthy.

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