Correct way to tighten a Canon Pinion

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Correct way to tighten a Canon Pinion

#1 Post by Nookster » Tue Feb 05, 2019 5:25 pm

Ever wonder the proper way to tighten a Canon Pinion.

The correct way is on the left. Not to tight and not to loose. It's a pain, but thought I would share.
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Re: Correct way to tighten a Canon Pinion

#2 Post by vintagehamiltons » Wed Feb 06, 2019 5:19 am

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Re: Correct way to tighten a Canon Pinion

#3 Post by JackW » Wed Feb 06, 2019 10:47 am

To expand on this.... Here are three types of canon pinions:

The 1st one is like what is in the diagram Nookster shared and is the most common type in Swiss watches:
canon pinion 1.jpg
canon pinion 1.jpg (179.22 KiB) Viewed 213 times
You'll notice that this one has been tiightened in the spot as indicated in the diagram.

In some older Swiss watches, you find these with a smooth bore. This one is from a A. Schild cal 137:
canon pinion 2.jpg
canon pinion 2.jpg (205.41 KiB) Viewed 213 times
Some one has tightened this one.
Both can be tightened using a staking set.

There is also a 3rd type I've seen.These have an adjustable flange and are more common on American made movements. This one came from a grade 33 Illinois movement.
canon pinion 3.jpg
canon pinion 3.jpg (186.4 KiB) Viewed 213 times
I've never needed to tighten one of these.
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Re: Correct way to tighten a Canon Pinion

#4 Post by SFC » Wed Feb 06, 2019 7:03 pm

Getting the cannon pinion to have the ideal tension is an underrated part of a repair... I always tighten them because I like to have the proper feel when setting the hands. Most of the times the cannon pinion has already been crimped and you will want to tighten in the exact same spot. If you have never done this before or you can't control your own strength you can put something through the cannon pinion (smoothing broach, broken oiler, etc) so that when you tighten you don't destroy the part. The standard finger/toe nail clippers can do this job. There is also a yellow handled bergeon tool just for this specific task... I have even known people to make custom bits for their horia jeweling tool to tighten with ultra precision (overkill in my opinion).

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