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Old 05-11-2008, 08:22 PM
Ian Robinson
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Ian Robinson is offline
 
Join Date: Jan 2007
Location: Gateshead
Posts: 2,205
Why not rig up a dc motor that is connected to microprocessor chip (need not be something expensive) that detects the DEC angle from any preexisting digital setting circles (or your computer , you are computerised afterall) and calculates the right rate of field derotation , converts that to the correct duty cycle and controls the rate of tube rotation via a pulse width modulated motor control circuit or a suitable vibrator circuit.


The motor could drive the instrument tube (which is separate from the nosepiece) via a high precision belt or matched pair of belts.

If you are handy with a soldering iron and have access to a circuity simulator program, it wont be all that hard to design a suitable circuit to do all the above , given a bit electronics knowledge.
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