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Originally Posted by Starkler
Remember that if you use a stepper motor that each discrete step should translate to 1 arc second or less at the telescope. This translates to 15 steps/sec or greater for a shake free view at high magnifications.
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Thanks Geoff,
Your post has caused me to recheck my calcs, since the threaded rod drive is slightly different to my original planned wire drive. Turns out about right with a 650mm radius south sector, and a 200 step motor in half step mode. Do not want to go much below 1 arcsec/step as I intend resetting the mount by running the motor backwards rather than by mechanically disconnecting from the drive. Having a smaller step size will reduce the speed of the reset. Yet to be seen if this actually works, of course, but its all good fun.
Regards,
David.