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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3 hours ago, richard said:

Thanks, photo added

What was asked is a picture of the mov.t, not of the part itself, which doesn't tell much.

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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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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.

 

Edited by szbalogh

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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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I had a similar problem with a 6497-2. I used a staking tool to give it a tap - actually a few taps. I was surprised how hard I actually hit it. But it works beautifully now.

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