Vacheron and Constantin Mainspring

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  • #50069
    jcrawford52
    Participant
    • Topics Started: 3
    • Total Posts: 7

    I am cleaning a Vacheron and Constantin pocket watch (circa 1910) and don’t understand the function of the cog and stop on the top of the mainspring (see photo). I have the mainspring apart, but am not sure how to set the tension when I reassemble it. When I rotate the barrel with the cog removed it puts tension on the spring, but I don’t know how tight to make it. Any help appreciated.

    #64898
    Bob Tascione
    Moderator
    • Topics Started: 38
    • Total Posts: 1553

    Hi JCraford52,
    Here’s an animation I did awhile back that might be helpful.
    https://learntimeonline.com/blog/geneva-stop-work/
    Hope it helps,
    Bob

    #64899
    jcrawford52
    Participant
    • Topics Started: 3
    • Total Posts: 7

    Bob,
    What a great explanation and what a clever mechanism. I never would have figured this out for myself, but you made it very clear. Thank you very much.

    #64900
    Bob Tascione
    Moderator
    • Topics Started: 38
    • Total Posts: 1553

    You’re very welcome JCrawford!
    Glad it helped out.
    Take care for now,
    Bob

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jcrawford52Vacheron and Constantin Mainspring