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Watch regulation...

Learning

By Learning
in Watch Repairs Help & Advice

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Learning New Member

Learning

Posted
Posted

While attempting to regulate a Seiko nh35a movement I found that when I adjusted the regulating lever to get a plus seconds per day reading it also changed the beat error reading on my timegrapher. I thought the two were independent of one another. Am I doing something wrong? Thanks for any thoughts or help on this problem I am having...

jdm Distinguished Member

jdm

Posted
Posted
18 minutes ago, Learning said:

I thought the two were independent of one another. 

They are mostly independent but since the regulator arm rotates in contact with the end stud arm can transmit some motion to the latter. Of course when you adjust the end stud the timing changes because both the total and effective hairspring length changes. Just gain some experience in making small, controlled movements to reach the best result.

After you have good timekeeping dial down, you will need to observe the positional error, especially in crown down position, if above 30 s/day some correction to the hairspring would be be necessary (rotating the etachron element often has no effect), that is to all effect adjustment and not simple regulation anymore, it's a difficult job for a beginner, and often ends in disaster, so be advised.

JohnC WRT Addict

JohnC

Posted
Posted

They are independent, IF the hairspring is not riding one of the regulator pins. If the hairspring "wants" to naturally sit outside one of the pins, then moving the regulator forces the hairspring inward or outward. This rotates the equilibrium (power-off) position of the impulse jewel, changing the beat error. When the hairspring is shaped correctly, it will pass between the regulator pins but will not be pulled in any direction by them, regardless of the position of the regulator.

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