Quote:I have an old DS-10 mount for visual observing. It tracks a bit slowly, however: at magnifications over 100x, this is noticeable. I have read on the web that Orion and later JMI and a few others produced a smallish unit (usually named "___trak") that would both allow one to run the AC mount from a 12-volt battery and also vary the speed. There seem to be multiple variations of these, including many that would run both RA and Dec drives and respond to autoguiding commands. That's far more than I need; I am just wondering about varying my RA rate. Has anyone used one who could give me more information?
Uncle Rod Uncle Rod's Astroblog: http://uncle-rods.blogspot.com/
Quote:Hey, Uncle Rod, Jimmy2K63,The lag is only in RA, and I tried JMI first (they essentially don't deal in these any more at all). I plan to open the drive up on my next cloudy night and see if there is something else mechanical going on. Barring that, finding a working drive corrector that I can connect the AC cord to seems like the best solution. Anything in particular I should look for or avoid?I'm an electrical novice (being generous with myself) and am hesitant to build. I've heard that S&T published plans a while back but don't know if that's true. If I could find instructions that I could read (with pictures), I would probably try to build one.
JMI 18" f4.5 Newtonian, split ring mount 10" f4.5 Newtonian on GEM (was a DS-10 once upon a time) ST-2000XM camera
Quote:Alterf, Avoid any used Meade drive correctors. They are inherently unstable due to cheap circuit design.
Quote:Quote:Alterf, Avoid any used Meade drive correctors. They are inherently unstable due to cheap circuit design. Actually, those Meades should be fine for visual use, which is what he wants. At this point in the drive corrector game Beggers Cain't be Choosers, I fear.
Quote: his point is that increasing the voltage would speed up the motor. That's true, right?
LX850 blog: www.LX-850.com
personal website: www.wadsworthobservatory.com
Quote: I watch for 30 minutes and the drive appears to lag. Perhaps if I watched for another 30 it would speed back up?
Quote:You have a 1/10th RPM motor. Any differences will happen within the 10 minutes, it is called periodic error. If it is still slow, you may have worm to worm gear facing problems. Be sure there is plenty of thick grease on the worm and on the teeth around the worm gear. Also check and remove grease between the clutch pads in the worm gear assembly and replace those 3 dang clutch screws with screws with small knobs and tighten LIGHT HAND TIGHT. Too tight will damage your drive if something binds. Not enough friction on the clutch coupled with friction in the RA axis will slow you down. You will have to cut a ~ 4" circular hole in the back of the cover to accommodate the knobsRemove the worm gear assembly and the clamp and pull out the Tee and check, clean, and lube the 2 teflon bearings with grease. You might do this on the DEC axis in the Tee as well. You should be able to spin both axis easily with your finger with nothing attached if properly lubed.