Alt gear slipping on Meade DS2xxx mount - fixable?
Posted 21 June 2013 - 12:59 PM
The Meade DS2xxx style mount under my year-old StarNavigator 102 refractor has begun slipping down after I release any of the directional navigation buttons on the controller. At 110X, for example, target stars will drop about half the field of view. As you can imagine this is extremely frustrating.
While I have considered binning the whole thing, I would like to do all I can to tune this relatively unused mount before I decide to replace it. Trouble is, I don't have the mechanical skill or experience with telescopes to suss out the problem.
Are there some basic steps I can take to return this mount to its best possible performance?
Thanks in advance,
Posted 21 June 2013 - 09:58 PM
Posted 22 June 2013 - 03:44 PM
Posted 22 June 2013 - 04:46 PM
It's the AudioStar controller, which I understand is like the 497 controller, but with audio features.
Posted 22 June 2013 - 04:55 PM
I did have the altitude gear assembly apart recently and did not notice any greasy parts, but I will check again once I get a chance to test some adjustments I made yesterday after writing my post. All I did was remove my telrad which had been preventing me from adjusting the balance of the OTA in the mount. I also re-trained my drives, though I had done that quite recently anyway. Now all I need is a clear night to try my luck.
I`m thinking that if nothing improves it`ll suggest that my reassembly of the altitude gear assembly is likely to blame for this wondering gear system. It does seem like I now have to tighten the clutch more to secure it sufficiently for tracking.
Posted 23 June 2013 - 01:59 PM
You have to pull the plastic cover off the inner arm to get at the drive. The retaining screws are under the Alt setting circle.
Another common problem is that the circlip that retains the pressure plate (a washer) comes out of its land and prevents the dog from engaging the worm wheel.
Posted 23 June 2013 - 04:53 PM
Thanks very much for the pics! They should be helpful once I get my gears apart.
I disassembled my altitude gear housing, at least partially, to get a look at the worm gear. Since I can't seem to post an image from a Dropbox URL here, I'll try to share it with this link
If you can view the picture, it shows the worm gear firmly engaged with the gear wheel. I would disassemble it further, but I can't work out how to do that properly. I suspect it involves twisting the flat-sided bolt in this picture but I don`t want to start strong-arming something if I don`t need to. Please let me know what you think.
Posted 25 June 2013 - 01:40 PM
Posted 27 June 2013 - 08:08 PM