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richard

Tightening a "THINGAMAJIG"

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Hi,

I'm tinkering with a movement from a Greville watch and the clutch/cannon pinion equivalent is very loose and hence the hands don't move, although the watch works OK. It's the type with a gear fixed to the mainspring barrel, not sure what it is called, but does anybody know if it's possible to tighten them up. 

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Think your movement is a EB1197 ?  And don't think the problem is in the mainspring or the barrel. It's the cannon pinion that is loose and needs to be tighten up. 

Or find a better one that works better. 

http://www.ranfft.de/cgi-bin/bidfun-db.cgi?10&ranfft&&2uswk&EB_1197

Cannon pinion on this looks something like this. 59d53d044905d_cannonpinion.jpg.41e957f122f3dce8a60b145b0b4e51ac.jpg

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 I seem to remember servicing a watch movement with that style of barrel/wheel set up. If my memory is correct this set up requires a certain amount friction to drive the wheel. The mistake I made was to clean & then lubricate which reduced the friction required. I had to give it a light tap with a closing punch to give it back the friction required.

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5 minutes ago, szbalogh said:

No no, the OP has right. The clutch here is on the barrel. Its a Roskopf-type solution.

And Clockboy is also right, one can tighten it with a light tap to increase friction.

 

I must say it's just a poxy design.  

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Success, the light tap treatment has worked, infact I'm a bit worried it may be too tight. We'll see. I think just a bit of hard hand pressure, with the right stake, would have done the trick. Thanks everybody for your help and replies. Richard. 

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