CGEM RA motor making loud jolty noises -emergency
Posted 06 September 2012 - 08:36 PM
Any ideas or suggestions? I have to have the mount packed up by tomorrow morning.
Posted 06 September 2012 - 08:49 PM
Posted 06 September 2012 - 09:10 PM
Posted 06 September 2012 - 09:22 PM
Remove the sprur gear inspection screw and look at the gear mesh for the RA axis.
Hi Stan can you explain further?
Posted 06 September 2012 - 09:28 PM
Posted 06 September 2012 - 09:55 PM
It sounds as if the gear mesh is to wide for the spur gear on the motor to the spur gear on the worm gear shaft. On the side of the main body of the mount, just below the worn gear shaft plastic end covers, there are some chrome slot head screws. Remove these screws and you can see the spur gears.
I think you are correct. It appears the motor is getting stuck then jumping. I am uploading poor quality videos.
I guess my next question is how do I fix this? I see a LOT of grease on the RA gears not so much on the DEC which is running smooth.
I have 4hrs to pack this up or bust.
Posted 06 September 2012 - 10:16 PM
Posted 06 September 2012 - 10:19 PM
go to the section "EQ6/Atlas Motor Gear Removal and Adjustment" (it's almost at the end). I've put the pics here for reference -
the procedure is exactly the same - remove the faceplate, then loosen the offending motor hold-down bolts. The CGEM uses servos so the motors look different (long and cylindrical).
Do not follow astro baby's instructions entirely and remove the motor!!! you just want to adjust the motor
Loosen the motor, then nudge it closer to the worm. In the case of the RA you want to push the motor to the right (toward the polar scope eyepiece direction).
Only use finger pressure (do not over-tighten, just eyeball the spur gear meshing through the peep hole). When the meshing looks good tighten the motor hold-down bolts. Put the cover back on, run the mount and listen for weird noises.
Posted 06 September 2012 - 10:21 PM
Saying thanks doesn't seem like enough. You may have saved my trip
Posted 06 September 2012 - 10:38 PM
Posted 06 September 2012 - 11:53 PM
Posted 07 September 2012 - 01:53 AM
Posted 07 September 2012 - 10:35 AM
Posted 07 September 2012 - 12:53 PM
I hope that you brought a full set of allen wrenches with you because it is likely that you need to adjust the worm spacing more than the spur spacing. If gears are binding, like it sounds, it is the worm spacing that is the problem. If things are simply noisy, then the spur spacing (and wobble) causes that.
Just brought the one lol. I did just order a hypertune kit from you though. Since this is the one and perhaps only time I will have the mount off the pier there will never be a better time. Hopefully it will arrive shortly after I get back.
Tomorrow I will post an update and hopefully will have good news.
Posted 10 September 2012 - 11:37 AM
I think it's actually easier in the white zone where you can count the number of stars and nothing is around Polaris. I thought it s cloudy the first night but the was the milkyway! I found the double cluster in my finderscope m42 is the only object I can find at home without goto.
Its just too bad about this motor problem. It did give me the incentive to buy the hypertune kit at least and I may yet get the photo I want.
Posted 10 September 2012 - 11:41 AM
Posted 10 September 2012 - 12:12 PM
Posted 10 September 2012 - 12:26 PM
Posted 10 September 2012 - 12:37 PM
Posted 11 September 2012 - 10:48 AM
I'm going to keep trying but worst case can I flip the mount and use the dec tracking as RA and at least get some milkyway shots?
This truly is a disaster. I've had the mount since 2009 and other then the hand controller going and a few power issues at the start I've never had problems..
Posted 11 September 2012 - 11:14 AM
or do you mean the worm is so tight against the worm wheel that the motor stalls?
when you lock the RA clutch, can you move the mount? (if you can then the worm is probably so far away from the worm wheel that it no longer engages)