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Nature isn't perfect...

 

Without being there it is difficult to say, but in general:
For the timing, there are some possibilities.  That could be the measurement error of the Witschi machine, I have never seen the specs of a Witschi, so I don't know.  Also any real oscillator such as the hairspring/balance wheel setup in a watch does not oscillate perfectly with every oscillation being identical.  As a statistical process the exact oscillation periods will form a Gaussien bell curve when plotted. 
But there is a simpler explanation: at 17997 the watch is going 14.4 seconds slow, 18002 is 9.6 seconds fast a day.
Is that the difference between the fastest position and the slowest position of the watch?

The amplitude does seem to be very high.  Was the lift angle set correctly?
Don

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4 Comments view entire thread 

technical question

 
By: radone : November 16th, 2012-12:50
Deal fellow collectors, I hope I am addressing my question to the right community. I tested today on a Witschi machine a watch supposed to beat at a frequency of 18.000 and I was surprised to see that, fully wound, its frequency was 17.997 to 18.002. Ampl... 

Timing

 
By: KM-Lon : November 17th, 2012-12:12
To get a correct reading you should have the Beat Mode on your machine set at automatic (this will automatically detect BPH), and to get an accurate amplitude reading you will need to know the lift angle of the movement you are testing lift angle can be c... 

Nature isn't perfect...

 
By: DonCorson : November 17th, 2012-12:28
Without being there it is difficult to say, but in general: For the timing, there are some possibilities. That could be the measurement error of the Witschi machine, I have never seen the specs of a Witschi, so I don't know. Also any real oscillator such ... 

Thenk you for your answer, Don!

 
By: radone : November 17th, 2012-16:49
I do not know the angle of the 5070 and, unfortunately, I didn't care about this indicator. I will make a more documented measurement and get back. Thank you for your help! Radu