Mech stopwatch minute counter lag
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Thread: Mech stopwatch minute counter lag

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  1. #1
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    Mech stopwatch minute counter lag

    Hi, I picked up a manual wind rattrapante stopwatch. It is a 100 hundred second timer.

    Which I had assumed was a 1/100 second timer. But it appears that it's just a 1/60 seconds timer.

    Not aure if it a problem per se. But the minute subdial only advances when the second hand hits the 80 seconds mark and not the 60 seconds mark.

    Has anyone experienced this lag before with a stopwatch? Is it normal?



    Thanks
    Last edited by teatimecrumpet; December 16th, 2015 at 07:16.
    radger and JOSE G like this.

  2. #2
    Member radger's Avatar
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    Re: Mech stopwatch minute counter lag

    Hi,

    That is an unusual timer.

    Could you please describe how it operates?

    I assume it has two center hands as you describe it as Rattrapante, does
    one of these hands whiz around allowing 1/60th sec timing?

    The minute counter out of sync is not normal but should be an easy fix, do you
    have a pic of the movement?

  3. #3
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    Re: Mech stopwatch minute counter lag

    Hi yeah it has two center hands. The main pusher activates both and then the the left pusher stops one of them but the other keeps trucking on.

    I did a search awhile back and found a worthpoint post about my watch (like I have in hand the watch they posted) from a 6 or so years ago that said he got it from someone who worked for a telecom company who used it to time transformers or something. I could tell they were the same from the damage at 40.

    I saw another post about these where someone said that from his experience the teeth can be worn down and the min subdials won't move or lag. So I guess that's the problem I have.

    But if a tooth is gone wouldn't the whole gear just not move if it got to that point?




    Sent from my LGLS660 using Tapatalk

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  5. #4
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    Re: Mech stopwatch minute counter lag

    Quote Originally Posted by teatimecrumpet View Post
    Hi yeah it has two center hands. The main pusher activates both and then the the left pusher stops one of them but the other keeps trucking on.

    I did a search awhile back and found a worthpoint post about my watch (like I have in hand the watch they posted) from a 6 or so years ago that said he got it from someone who worked for a telecom company who used it to time transformers or something. I could tell they were the same from the damage at 40.

    I saw another post about these where someone said that from his experience the teeth can be worn down and the min subdials won't move or lag. So I guess that's the problem I have.

    But if a tooth is gone wouldn't the whole gear just not move if it got to that point?
    I doubt that this problem is due to worn teeth on a gear wheel.

    The minute counter wheel most likely just needs reset (rotated) so it jumps at the correct moment and the
    minute recording hand reset to the correct position.

    Or the minute recording intermediate driving wheel needs reset to the correct position, it's difficult to see if the minute recorder
    is jumped by 'fingers' or cam type mechanism from the intermediate wheel, often these fingers can be simply rotated on
    the shaft to the correct position.

    Either way, it should be a straightforward fix for a watchmaker, only requiring minimal disassembly... but it is an old and well used
    timer so could well benefit from a service if it is to be used.
    teatimecrumpet likes this.

  6. #5
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    Re: Mech stopwatch minute counter lag

    Thanks radger this will end up on my to do list and would take it apart myself when the time came.

    Thanks

    Sent from my LGLS660 using Tapatalk

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