tooth decay :-(

Discussion in 'Watch Repair' started by Britannicus, Jan 26, 2019.

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  1. Britannicus

    Britannicus Registered User

    Apr 26, 2016
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    Hi there - I have a nice functioning Waltham which struggled to wind. So I got the back off to see that the problem seems to lie with the ratchet wheel missing a tooth - is there any way I can fix this - or is it just a question of looking for a suitable "spare or repair" wheel - pocket watch DB says it's a model 1888 made in 1894 - scale is in mm





    Sat Jan 26 18-30-07.jpg
     
  2. Dave Coatsworth

    Dave Coatsworth Forums Administrator
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    Feb 11, 2005
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    Hi Britannicus,
    Since this is more of a repair question, I'm going to move it to Watch Repair.
     
  3. richiec

    richiec Registered User
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    Feb 24, 2007
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    I would look for another, I have a bunch of parts that I can look through to see if I have anything that matches.
     
  4. karlmansson

    karlmansson Registered User

    Apr 20, 2013
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    Is it a steel or a brass wheel? If it’s brass (which it probably isn’t) it can be salvaged by making a dove tail recess where the root of the broken tooth is. You can then insert a matching brass piece with enough protruding for you to be able to form a new tooth with very fine files or, if you have it, a form tool on a milling machine. It’s very delicate work and if you haven’t done it on a clock before, I would hesitate to do it.

    For clocks you can add a little bit of soft solder to keep the piece in there axially. For a watch I think the best would be to peen the inlay piece stuck. I have never done it on a watch though, just know that soft solder has no business in watches.

    Still, if you get the chance to do it on a clock I can recommend it. Very satisfying!

    Best regards
    Karl
     
  5. Chris Radek

    Chris Radek Registered User
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    Apr 13, 2014
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    Be aware this is probably a result, not the cause, of the hard winding. If you put in a new wheel without a correct repair and service you might just break the second one. Plain lack of service can sure do this, but so can various kinds of wear.
     
  6. gmorse

    gmorse Registered User
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    Hi Britannicus,

    Whilst Karl's suggestion is technically possible, on a steel wheel like this you'd really need to use a hard solder to make it secure, but there's no way you could do that without ruining the cosmetic appearance of a damaskeened wheel like this. I think peening it in wouldn't work here because these wheels are pretty hard, and it would still leave ugly marks however carefully it was done.

    Regards,

    Graham
     
    karlmansson likes this.
  7. pocketsrforwatches

    pocketsrforwatches Registered User
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    I think I have what you need. PM your email and I'll send you a picture. I'll mail it to you N/C if you can use it.

    Roger
     
  8. karlmansson

    karlmansson Registered User

    Apr 20, 2013
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    I agree Graham! Note that I wrote that if it is NOT steel. Slim chance for a ratchet wheel but it was hard to tell from the picture.
     
  9. Ticktinker

    Ticktinker Registered User

    Jul 7, 2015
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    Not sure if it would interchange but I have a donor model 1894.
    Perhaps if you posted an outside diameter... I could check against what I have.
     

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