Quote:
Originally Posted by wasyoungonce
John..a pic of the drive controller would help identify it. Also a pc of the drive system. ...are their belts? or just plain gears and worm?
You should be able to swap just the motors, they will be interchangeable.
Brendan
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The motors are using a steel roller system and are different in that the RA motor has a counter acting element on top of the motor unit that allows you to wind up so to speak the East or West direction of the drive and eliminate any slop that the motors have.
Here is a video of me rocking the scope in RA.
https://www.flickr.com/photos/johnka...57594183210993
I'll take a photo of the drive system and post.
Pretty much identical to this:
http://www.astromart.com/classifieds...fied_id=807974
Some more photos of the scope which show some drive shots.
http://www.optcorp.com/jm-ngt12-5-ng...telescope.html
Quote:
Originally Posted by Wavytone
At 9m focal length you're going to visibly see the effects of:
flexure in the telescope assembly which will also vary according to its direction (both on altitude and azimuth) if it's an equatorial or fork mount.
You can roughly compensate for these by tweaking the drive rate (eg the King rate is an approximation to allow for refraction) but if you are after zero drift on this scale the only solution is to use an auto guider.
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I'll try a different rate tonight but also get some weight to create an East bias and see if this helps. Firecapture allows me to guide, but at the moment only does corrections every 1 second. Have written to the author and ideally want 0.1 seconds - so then I can capture and I can guide simultaneously but without a back and forth motion.
Just a thought, if a voltage regulator does not work the way I imagined it, what about placing this between the drive and the RA motor it self? So the drive will think it's putting out the right level of voltage but the motor gets less??? The only issue is that it's a telephone jack type chord. Just a thought.