Watch stops when canon pinion tight

[Khan]

Hi

When I loose the canon pinion, it obviously doesn't turn the minute hand. When I tighten it, the watch either runs poorly or stops in a low power reserve. Movement Universal 129. What am I doing wrong? 

Image attached with canon pinion displaced. 

Kind regards. 

[Nucejoe]

probably too tight, excessive tightening in effect integrates canon and the arbour into one piece. Canon pinion is suppose to turn on the arbour it is mounted on, to set the time. first thing to do in case you haven't already is to put some oil in the canon and turn . If no good you would need to broach it.

[nickelsilver]

I suspect there is something restricting the minute wheel from turning freely. Even if the canon pinion was so tight it was hard or impossible to set the watch it wouldn't stop it from running normally.

[Khan]

The canon pinion is fairly easy to remove with a tweezer, so it shouldn't be too tight. 

Actually, the watch runs very good when canon pinion removed.

Edited May 13, 2020 by Khan

[JohnR725]

how does the watch run if the canon pinion is on but the minute wheel is removed?

[Nucejoe]

If canon pinion is too tight, it sets the enitre min train  to move.

I eliminate gears from canon pinion on to the end of min train one at a time and make sure posts the gear sits on are not loose, further I grab the canon pinion , shake see if it feels loose inside the center hole.

 

 

 

[JGrainger]

Is there sufficient endshake when the cannon pinion is fitted? - a long shot, possibly caused by wear / past replacement parts etc.

[Nucejoe]

Could be the bridge on minute train pushing down on gears,  just to test I loosen the screws on the bridge.

[Khan]

On 5/13/2020 at 10:38 PM, JohnR725 said:

how does the watch run if the canon pinion is on but the minute wheel is removed?

It looks to run as good as when canon pinion removed. The watch now starts with a couple of winds. 

[Khan]

2 hours ago, Nucejoe said:

Could be the bridge on minute train pushing down on gears,  just to test I loosen the screws on the bridge.

I tried that and it runs remarkably better when the screws not tightened at all but just turned into place. I'm now testing the power reserve and see how it goes. 

[Nucejoe]

11 minutes ago, Khan said:

I tried that and it runs remarkably better when the screws not tightened at all but just turned into place. I'm now testing the power reserve and see how 

[Nucejoe]

Great,  I check the min train birdge for sign of gear rubbing on it,  you can shim the bridge or attack with sand paper or a flat face chisel, whatever approach that suits you to eliminate the rubbing.

Good luck.