Movement identification

[Bonzer]

Thanks very much!

I think the hook may be way past being able to be dressed by filing but I'll have a look. 

The annealing process might be an obstacle to me adding a pin, but we'll see.

I appreciate your help, thanks.

Edited March 23, 2021 by Bonzer

[Bonzer]

I finally managed to remove the cannon pinion. I soaked in oil for a day but that didn't work so then I soaked it in WD40 and that did the trick. It appears that the steel shaft had some rust on it which must be why it didn't come off easily.

On different note, do you think the hook on this barrel arbor is retrievable? To me, it doesn't look as bad as I first thought.

[oldhippy]

Have you tried the spring on it if so what does it look like and will it hold. You don't want to start fiddling with it if it will hold.  I must say looking at it under magnification it doesn't look good. 

[JohnR725]

1 hour ago, oldhippy said:

Have you tried the spring on it if so what does it look like and will it hold. You don't want to start fiddling with it if it will hold.  I must say looking at it under magnification it doesn't look good.

It does have a really peculiar look like it was very very poorly made perhaps. The thing to do is to put the spring back in try it and see if it's going to work at all before you try to file or do anything with it. We might be surprised it actually works or maybe that just putting a proper edge on the hook might work if you're lucky.

[Bonzer]

Well, it didn't hold so I tried filing the end of the 'hook' with a triangular file. It seems it might have worked although I need to test it properly in the movement or with a pin vice.

I will order a new mainspring. The existing one is 1.4 x 0.15 x 380 but I can only find a replacement that is 400mm long. Would this matter very much? The barrel is 12.3mm in diameter.

[JohnR725]

7 minutes ago, Bonzer said:

400mm long.

Providing the other dimensions are correct that extra Length will not be the end of the world.  The most critical is the width because that determines whether it's even to fit in the barrel or not. The thickness is how strong the spring is this becomes interesting because the original if it was blued steel versus the modern the modern will be stronger for the same thickness supposedly in another discussion group somebody told me as totally wrong on that one but seems to whatever one thinks. Then the link could be shorter or longer it would affect the running time of the gets dramatically too long Or two short but it have to be quite a bit.

[Bonzer]

Thank you. I measured the thickness with a micrometer and the height with calipers so it should be spot on.

[Bonzer]

Back to one of the original reasons for this thread - the need for a cannon pinion to fit this watch:

I obtained a movement that was very similar but not similar enough (see warning in earlier post by oldhippy 'they look the same but there is always something wrong')!
The cannon pinion in this replacement movement is slightly shorter but the pinion meshes nicely with the wheels and the existing hour wheel will still work nicely.

However, the diameter of the centre hole is slightly smaller than it should be to fit on the existing pinion shaft. Now, I need to use the existing shaft because the minute hand needs to fit properly. Is it viable to ream the hole in the new pinion so it fits the old shaft? 

[oldhippy]

Yes you can do that but not to much and be careful not to split the shaft a little oil will make cutting easier, doesn't matter what type you use.  

[Bonzer]

What about using a cutting broach, would that work? 
It seems that micro-reaming tools are very expensive 

[oldhippy]

I thought that would be the tool you would be using so yes that's fine.