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Best Way To Refit Canon Pinion

Andyclient
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Andyclient Super WRT Addict

Andyclient

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I was devastated today , stripped cleaned oil and was re assembling a Movado 150mn movement , and all was going really well until it came to refitting the canon pinion.

It was tight to go on , so i got a pair of tweezers either side of it to push it home and it broke off the centre wheel pinion.

I have ordered a new wheel and canon pinion , fortunately Cousins stocked them , but before i had another go tomorrow i thought i would ask you guys for some advice as to how you do it safetly.

I must admit i was a bit surprised i wasn't particularly heavy handed or at least not for me.

Any advice most appreciated 

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Vich Distinguished Member

Vich

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I am presuming you have not got any appropriate punches or elaborate kit. Check to see if the pinion can be supported up against something hard below.  The problem then is the downward pressure must be perfectly vertical and even.  Then something tubular and close fitting punching it downwards in the vertical plane. make sure all is clean and polished before you start.

 

Hopefully that will work,

 

Cheers,

 

Vic

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jdm Distinguished Member

jdm

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I wouldn't worry too much. The tube of the central wheel is thin and stressed continuosly, call it a case of 'metal fatigue' if you want. I had a brand new Seiko on which it was broken already without any use or manipulation.

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oldhippy Distinguished Member

oldhippy

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I just used tweezers, use the flat top end if the cannon pinion were closed, open top c/p  tweezers each side and push down. Never use oil or grease, this can make the c/p loose and then the hands won't carry round.  

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Mark Distinguished Member

Mark

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I would suggest the best way to fit a canon pinion is by using a staking set especially if it is really tight fitting. Aside from the risk of breaking the centre wheel, if the centre wheel pivot hole is jewelled you risk altering the position of the Jewel or even cracking it. Also, remove the minute wheel before fitting a tight canon pinion as the teeth can easily get damaged.

Sent from my iPhone using Tapatalk

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Andyclient Super WRT Addict

Andyclient

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Thanks guys for your help, I do have a staking set so will use this and without the minute wheel fitted The pinion came off ok so I didn't anticipate a problem but it was really tight to go on Hopefully the new wheel and pinion will arrive today , will keep you posted. Many thanks once again

Andy

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Andyclient Super WRT Addict

Andyclient

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Hello Andy,

 

I wrongly assumed that you did not have a staking set when you used tweezers.  Anyway good luck.

 

Cheers,

 

Vic

Hi Vic

All the gear and no idea i think is the phrase lol 

All now done using the staking tool this time , thanks again all

Andy

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