Gday Mark
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Andrew, why not give it a shot on a cheap mount and see what happens. My EM200 has the encoders on the end of the worm so you might be on to something.
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I only have Meades and an EQ6, so too hard.
The EQ6 doesnt have the space, and with the Meade, i know more than enough about how the firmware works to know that reverse integrating it would be more of a problem.
Getting it to track at a set rate may be OK, but how to control motor reversals ( esp in DEC ) would be more effort than its worth.
And just for info re the manufacturing tolerances, i did the numbers on a meade wormwheel a few years back
With a 5" dia wormwheel, one arcsec of error at the point of contact with the worm is approx 0.00031mm.
Puts it into perspective how small the tolerances are
Andrew