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Backlash of 20? I can detect that the slack has been taken up in the cogs after 2 pulses of 8 (ie 16 microsteps) where as you are at 2x20. Interesting.
Do you know how many steps you have within the CFZ before you pass back out of it?
I have a dial gauge at work I can use to measure travel in the micron range. I will have a look to see where I am with it.
I have found that microsteps under 4 and my motor becomes unreliable. It seems to falter sometimes. 4 and above no problem.
PS what do you think about the tube temp control idea?
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