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    Re: Backlash
    From: Bill B
    Date: 2005 Nov 20, 16:35 -0500

    Alex,
    
    If I control the movement of the index arm laterally I cannot measure any
    significant backlash.  (Astra III B Deluxe, tradition horizon mirror,
    approx. 1 year old--worm gear spring loaded.)
    
    What is causing me concern is a slight lateral play in the index arm at the
    arc.  The front of the arm unit has slight left/right motion.  It can be
    felt by moving the arm left/right or as a slight click when changing from
    clockwise to anti clockwise. One motion will, given the angle of the notches
    on the arc, force the arm in and the other direction will force the arm out.
    I can see it as separation or overlap when I touch a the Sun's limbs and
    press in our out.
    
    Using Sun limbs, and small power lines (sextant tripod mounted for the power
    lines to eliminated possible affects of side error) it believe what appears
    as backlash (although I believe it to be lateral arm motion) is in the 0.2'
    to 0.3' range.
    
    Bill
    
    
    

       
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