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    Re: Backlash
    From: Jean-Philippe Planas
    Date: 2005 Nov 21, 10:15 -0800
    Hi Group,
    I used this small screw to adjust the backlash of my 1976 SNO-T. When you un-screw this screw, it tightens the movement between the worm and the teeth. When you un-screw too much it almost blocks any movement. The screw is very sensitive. The clock master screw driver is also used to disassemble the index and horizon mirrors clips that are fastened to the mirror frames by very small screws.

    Alexandre E Eremenko <eremenko@MATH.PURDUE.EDU> wrote:
    Thanks for your explanation.
    I thought of some adjustment which could decrease
    this shaking.
    There is a misterious screw on the "other side" of
    the Trommel, (the side of the legs) of very small size,
    when they adjusted in Freiberger factory, they mainly rotated
    this screw. My German is too poor ! to understand their explanations
    but somehow I concluded from their explanation that they were
    adjusting the backlash. The standard package for SNO
    contains a "watchmaker screwdriver", and the only possible use
    of it can be adjustment of this screw (all other screws are
    of much larger size). On the other hand, the user manual says
    that "it is prohibited to rotate this screw on board of a ship",
    and that this has to be done only in special workshops.
    Do you understand what this screw really does?


    On Mon, 21 Nov 2005, Bruce Stark wrote:

    > Alex,
    > You wrote:
    > > Can you explains what are the features in SNO-T
    > > to control the side shake?
    > >
    > On the bottom of the limb there's a sort of upside-down monorail. The gear
    > teeth are cut into the bottom of it, but it's the parallel sides of the rail
    > we're interested in. The barrel of the index has a long slot th! at fits over the
    > rail. There's just enough room between slot and rail to avoid friction. The
    > slot is long enough to also prevent any twist or yaw in the index.
    > The Tamaya gets the same effect with two rollers that fit into a groove in
    > the bottom of the limb.
    > Bruce


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