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Cannon Pinion Tightening Tool


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I seem to be having a run of loose cannon pinions, especially on small calibre (ladies) movements.  Don't have a tool for tightening so would like advice for suitable tool.  I have seen the Bergeon pliers type but wow are they expensive!  Do not want one that needs jeweling tools etc to use it.  Any suggestions/sources most appreciated.

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Hi  There are some which come up on Ebay  that are like a small chisel like punch on a small chisel anvil for pinching the cannon.  I have managed it with a pair of top cutters that are blunt but its too easy to over do it. If you have a staking tool you could use that with the appropriate stake and punch.

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Thanks for your responses.  I will keep an eye on the bay for a proper tool. In the meantime I have some old nail clippers and have flattened the cutting edges on it.  I might try and drill a hole and fit and adjustable/locking screw for better control (not sure if the material might be too hard to do this.  If not I'll give it a go without.

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  • 1 month later...

Here are some pics of my nail-clipper mods, for those hobbyists who do not have lots of cash!!

Only cost would be for a suitable drill for the setting screw hole (tungsten carbide needed as material of arms is very tough), the rest from the 'bits box'. The original pin for the lever was 5mm diam hence the crimp screw diam, this could be different for other clippers. Any epoxy would do but JB weld sets very hard. The setting screw can be any size provided it does not compromise the integrity of the arm (ie weakening it across the arm) and the locking nut fit re fouling the crimp screw head.  The crimp screw could be in the other way but thought easier to have both screw heads on same side.

1. COMPONENTS.jpg

2. ASSEMBLY.JPG

3. TOOL.jpg

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  • 4 weeks later...

Now managed to get a thin piece of steel wire to which I filed a taper and polished it and which now fits in the cannon pinion for a ladies watch.  I mounted the tool in a small bench vice so that the screws end was upwards.  This leaves 2 hands for turning the setting and pinching screws. It also made it much easier to fit the cannon pinion in position as it is fed downwards into the pinching slot to get the starting set point, and allows the wire to be manipulated to feel a good pinch status and allow removal of wire.  I did note that the pinching screw can still be tightened beyond the stop screw setting due to flexibility of the arms, but this actually allowed a bit more control over the pinch !!  The cannon seems to be working fine now.

Edited by canthus
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  • 9 months later...
On 1/26/2020 at 1:11 PM, Nikia said:

I’ve managed to fix some really old ones McGyver’s style: a bit of plumber’s teflon tape where the cannon pinion fits ahah

Been having a devil of a time with a slipping cannon pinion.  Used my tool to tighten, but after several tries, I was afraid to get to a point of no return.  So I have tried the teflon tape idea...hoping it works...tired of fighting this thing.

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On 1/28/2020 at 3:51 PM, jdrichard said:


It is a man's man solution to repair....should have used duct tape a la Red Green

Sent from my GT-N5110 using Tapatalk
 

Look at the possitive side jd, we can regard this plumbers tape technology as pioneering work on water proof canon pinions.?

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  • 1 year later...

@canthus,   

 I  meant to show picture of your design and searched for it to no avail, its more versatile than the one I made. 

We are both safe as long as bergeon doesn't find us.  LOL

Regds

 

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  • 2 months later...

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