Quote:
Originally Posted by Wavytone
Regarding the friction drives, I wouldn't get too obsessed with the possibility of slip or inaccuracy of the reduction ratio because in tracking stars, atmospheric refraction means the apparent rate in hour angle is slight variable, depending on elevation.
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Yeah, I am aware of this and figure tracking would deal with the elevation error. I like the simplicity of friction drives and the idea of avoiding $2k++ per drive axis is very appealing as well. Had not thought about using a differential gearbox for different slewing rates. That's gotta be a good line for further research.
Rom