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I can't add much to the technical discussion here but thought it might be useful to let you know I can run my Bartels stepper system comfortably at 3 degrees per second when slewing. In fact I can run azimuth at 4 degrees per second. The alt drive won't go that fast - I assume slight imabalances in the tube prevent that as well as a slightly finer gear resolution. I use large expoxy worm gears so they are very cheap and work well visually.
I am used to running the system at 2 degrees per second for slews and find that more than adequate. Adding flywheels recently increased the speed. Slewing is much quieter than the commercial SCT systems I have seen. Steppers are noisy when tracking and I find that annoying but the noise can be reduced substantially by using plastic mounting bolts etc.
Thought I would add this for sake of completeness when discussing / comparing the Bartels drive.
Rod.
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