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It is a BIG one. An Astro mount (27 KG) with a 12 inch tube. Although I converted the tube to plywood the tube with all the gear on it comes in at only 15 KG.
The setup is well balanced. The gears are 15 cm in diameter. There is no slewing.
Fast forward, wait for it, is twice the speed of the drift of a star. I tried the stepper without any load, and of course there was no problem.
The problem, including the ST-4 guiding; see ( Astrophography and Imaging) "ST-4 problem" began without apparent reason about two month ago.
Actually, come to think of it, that was the time I slowed down the speed of the RA tracking, closer to what one normally would have it set at, namely precise tracking. Prior to that I had the tracking faster for the purpose of having the auto guider stopping the tracking only, rather than stopping and speeding up. Anyway, perhaps I should be looking for a stepper motor with more torque? Is their is such a thing?
Thanks for your inputs
Ken
Last edited by solissydney; 30-03-2010 at 05:50 PM.
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