Posted by Lenord on July 21, 2001, 7:00 am I have yet to find servicable servos that are cheaper to buy than steppers. Mel's system can conrol servo motors too. Belts can be used on Mel's system if you wish, but PE can be compensated for via the software if need be. BTW, for visual use, the way most users have geared their scopes, PE is typically only visible via ccd camera or on film. In order to see it visually, it requires a couple of barlows and a high power eyepiece, spoiling the view of the object in question anyway. Lenord --Previous Message--
Hi Antonio,
: Hi! I've read somewhere that servo motors would
: be much better than stepper motors for
: astronomical mounts, because of the very
: philosophy by which they are built:
: instead of advancing in discrete steps
: (making it very costly to reduce
: step-size), they advance at a continuous
: rate (which is supposedly cheaper to do
: slowly). Furthermore, I guess in the same
: article, I'm sure I've read that if you
: use a pulley and belt system in place of
: the standard worm gear system (i.e. Harley
: Davidson motorcycle transmission vs BMW)
: you are almost sure of eliminating
: periodic error and all the other
: irregularities in your drive system.
: Has anybody else seen/heard anything like
: that?
: Thanks
: Antonio
:
:
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