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Kaizu
sage
Reged: 08/17/07
Posts: 253
Loc: Finland
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Re: Arc seconds per step for high end mounts.
07/17/08 02:38 PM
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Sorry about the delay, I had a one week stint to Japan.
I do not use microstepping, only the half steps. For the speed correction I have three stage switch - stop/ 1X/ 2X.
the 1X is tracking by halfsteps and the 2X is forward correction by full steps. I just have the gear ratio so big that I dont need the microstepping. Old stepper controller shows how I have built the controller. This is the very first version where the tracking was too coarse for imaging with long focal length.
Afterwards I multiplied the gear ratio by ten and removed the fast move unit. I search the targets manually and had the fine adjusting screws for final aligning.
The text is in Finnish but the schema shows the principal.
Kaizu
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Some thoughts are so wise that they don't make me laugh
http://www.kaiforssen.fi
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