naming of parts?

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  • #50133
    johnno
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    • Topics Started: 19
    • Total Posts: 55

    Hi all

    Sorry for the newby question. I am assembling my first vintage watch, a Movado cal.175 (Identified by the rannft movement archive). The gear train and balance wheel are running freely; however, when I press the hands into place the balance wheel stops oscillating. It has been suggested to me that the subsecond arbor maybe bent. My questions are? (1) have I correctly identified the subsecond arbor and (2) does it look bent?

    thanks
    John

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    #65033
    drichards
    Participant
    • Topics Started: 3
    • Total Posts: 35

    Hello John,
    No that would be the minute or intermediate gear post. The sub second pivot would be the longer pivot that extends through the jewel at the 6 o’clock location. This is the pivot that the second hand fits on. Yes it sure does appear to be bent.
    Hope this helps
    Dean

    #65034
    johnno
    Participant
    • Topics Started: 19
    • Total Posts: 55

    @DRichards wrote:

    Hello John,
    No that would be the minute or intermediate gear post. The sub second pivot would be the longer pivot that extends through the jewel at the 6 o’clock location. This is the pivot that the second hand fits on. Yes it sure does appear to be bent.
    Hope this helps
    Dean

    Got it! Thank you. Btw, you have eagle eyes!

    I guess that would be the the cause of my gear train stopping problem?

    cheers

    #65035
    johnno
    Participant
    • Topics Started: 19
    • Total Posts: 55

    To test this, I put the hands back on and the movement didn’t stop. Put on the subsecond pinion and it came to a stop quick enough.

    Any thoughts/tips on bending it back without breaking it? 😯

    #65036
    randy
    Participant
    • Topics Started: 39
    • Total Posts: 594

    Johnno.
    My guess is that it’s bent just enough to cause some rubbing, either the base of the hand rubbing on the edge of the dial/jewel cup or the point of the hand hitting the dial face, therefore stopping your motion.
    You can try to straighten it by using some wide – flat tweezers.
    Heat the tweezer ( not red hot..but pretty warm). Place them over the pivot and “draw” them towards the tip of the pivot while applying VERY light pressure. You may have to do this a number of times to get it close enough to be acceptable. Don’t twist the tweezers back and forth as it will take nothing to work harden the pivot and it will snap..Also,..there’s no guarantee that it won’t break off anyhow..they can be pretty fragile.

    Best of luck

    Randy

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johnnonaming of parts?