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Wedge Modifications
Wedge Modifications Dec Encoder Hand Controller CCD LX200C AHC New Motors

 

As noted before, my primary complaint with my LX200 has been the slop in the superwedge.  This slop was present in both the azimuth and altitude adjustments.

Altitude Fix
    To source of slop in the altitude adjustment was within the mounting of the two 1" diameter rods that are connected to the altitude screw.  As you would change directions with the altitude adjustment knob, the rods would spread apart, or come closer together before any altitude change could take place.  My modification was to take four 1.25" bronze bushings and turn them down to fit snugly into the sides where the rods fit.  The inside diameter was turn to .875".  The ends of the 1" rods were turned down to fit snugly into the bearings.  The bearings still allow the rods to rotate, while not allowing them to shift around.

 Bushings - before and after     1" Rods, turned down

 Bushing and Rod                     Busing in side of wedge

   Main plate and bushings       

Azimuth Fix
    The source of slop in the azimuth adjustment was due to the threads in the azimuth thrust bar being oversize.  This allowed the azimuth thrust bar to pivot on the azimuth adjustment screw.  To fix this, I machined a new azimuth thrust bar.   Instead of it being in contact with 1" of the azimuth threaded rod, my new piece has 3" of contact.  This has lead to virtually no slop at all in the azimuth adjustment.

 New and old Azimuth Thrust Bars

Drawing of new Azimuth Thrust Bar (There is an error in the drawing - the 1/2 - 18 thread is really 1/2 - 13)

   North view of new Azimuth Thrust Bar

  South view of new Azimuth Thrust Bar


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This page was last modified: 01/22/14
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