Vixen Polaris GEM mount stripped gear advice
Posted 22 November 2012 - 01:20 AM
First time posting here, it's good to see so many fellow telescope enthusiasts! I recently acquired a Celestron SP C102, same as this one:
Recently, I've been having some rather troubling issues with my Vixen Polaris GEM mount.
When I rotate the azimuth control knob, the gear slips, and doesn't rotate the top section as it should. Not only that, but everything above that control knob can be moved up or down by a slight push, when it shouldn't be able to move at all. I disassembled it and it appears as though this gear is partially stripped:
Not the smaller gear spindle, the larger hollow cylindrical one to the right, which appears to be made of aluminum or steel.
I wiped all the grease off both gears, which had a lot of ground up metal shavings in the teeth, and cleaned up both ends thoroughly. It actually doesn't LOOK like it's stripped, it doesn't really appear damaged at all, but I know for for a fact it's stripped. Not knowing what to do next, I applied some Vaseline (I didn't have the right grease for the job), and put it back together, but sure enough it would slip when rotating the azimuth control, and if I tightened bolt holding the 2 gears together too tightly, it wouldn't rotate at all, so no threshold between locked and slipping.
I opened it up again, and the metal shavings were back with a vengeance. I'm really at a loss here, after cleaning out the gears and putting it all back together, they still slip, or don't want to turn at all. I have an idea of how to fix this, but it involves several hours and a dremel, and I would rather try something else if possible.
Has anyone had this problem before, or does anyone know how to fix this?
Also, I'm not a big fan of the Polaris GEM mount, it's heavy, it's hard to move around, and as you can see, it's been giving me some problems lately. It's around 30 years old at this point, and I'm looking to upgrade to something a little better.
Do you know of any particular mounts that fit the Celestron SP C102, and that:
1. are cheap
2. have some kind of smooth, computer controlled tracking system
3. are relatively lightweight
4. are easy to move around, have telescopic legs, etc.
5. are the color black (not that important)
Posted 22 November 2012 - 01:56 AM
Posted 22 November 2012 - 02:09 AM
The CG-5 ASGT is the cheapest goto you can get. But if you think it's lighter than your Super Polaris, you'll be unpleasantly surprised.
Posted 22 November 2012 - 01:07 PM
If you want to switch to goto of similar size, the best choice is the CG-5GT. Non-goto would include some of the small Orion GEMs.
Posted 22 November 2012 - 05:48 PM
Posted 23 November 2012 - 08:50 AM
Posted 25 November 2012 - 01:56 PM