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Cyma movement 459

SK2

By SK2
in Watch Repairs Help & Advice

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SK2 Member

SK2

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Recently,  I was repairing a cyma watch.  The spring holding the jewel on the balance bridge end was broken and I changed the balance assembly to another one from a similar 459 movement .   However, to my surprise,  the watch was faster by the hours, not minutes. 

When I put it on the time grapher,  I realise that the fequency is 25,500  instead of the normal 18,800  for such a movement. 

I had no clue as to why the frequency went so high.  Is it due to the hair spring touching somewhere ?  If not, what are the possible reason ?

Thanks

SK2

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Nucejoe Distinguished Member

Nucejoe

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4 hours ago, SK2 said:

due to the hair spring touching somewhere ?  If not, what are the possible reason ?

Sticking or the coil fouling itself and though rare but having wrong hairspring on the balance wheel, or wrong wheel fitted on the staff. 

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SK2 Member

SK2

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On 4/21/2022 at 10:48 PM, Nucejoe said:

Sticking or the coil fouling itself and though rare but having wrong hairspring on the balance wheel, or wrong wheel fitted on the staff. 

Thanks for your reply.  I will check it.   Most probably it is the hair spring touching at one point .  

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