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Rolex cannon pinion and broken center wheel

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LittleWatchShop Distinguished Member

LittleWatchShop

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This came from my Dad's stock of parts.  He likely replaced the center wheel and kept the broken one.

My question is this.  Do you think the dent on the cannon pinion was done at the factory, or is this likely the cannon pinion that was removed when the center wheel was replaced?

Alternative theory is that the dent was made by a watchmaker to increase the friction of the cannon pinion on the center wheel post.

2021-01-31 15_52_08-Photos.png

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Nucejoe Distinguished Member

Nucejoe

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Any reason why the factory should make a dent on this supposedly high precision canon pinion?

A true watchmaker keeps such broken peaces for the gear is still good and can save a watch, so is the canon pinion.

 

 

 

 

 

 

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LittleWatchShop Distinguished Member

LittleWatchShop

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2 hours ago, jdm said:

The common way to adjust a cannon pinion. The related trick is, if it has been closed an hair too tight, it can be so slightly reopened pressing on the same point, but when fitted to the wheel. 

Thanks jdm.  I have done this myself several times.  What I was wondering...for brand new movements, are cannon pinions adjusted at the factory?

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