G-11 clutches clean-up and re-greasing
Posted 16 January 2013 - 12:53 AM
I did lots of research before purchasing it, and found out that it needs periodic cleaning and re-greasing of the RA and Dec axes to keep grease away form the clutch pads. I asked here on CN if anyone could point me to links with instructions on how to do this. I found that all of them went beyond this basic job to include things that were not part of it.
So, after doing the job, I made my own instructions, and posted them here.
That's a link to my 'blog', but I don't use it as one. It's more my website, where I put information about my business and interests. None of my other pages allow comments, and I didn't want this one to, but for some reason, it does; at least for now. I'd like comments on what I wrote, but I'd prefer them to made here on this thread. I've got no interest in moderating even a tiny part of the internet!
Posted 16 January 2013 - 10:21 AM
Posted 16 January 2013 - 10:34 AM
I hope others find it useful as well.
Now I'm going to replace the old Hurst motors with newer stepper motors. The motors came from Losmandy yesterday, but with no instructions. I can't find any online, either; though there are lots of posts dealing with Gemini. If it's super easy, I won't bother, but if it seems like it would help, I'm going to take more pictures and make another post.
Posted 16 January 2013 - 11:01 AM
It should be super easy. Remove the 2 cap screws holding the motors to the gearbox, remove motor. Put new motor on gearbox, reinstall 2 capscrews, done. I've cracked enough gearboxes to be able to replace the GB in ~10 minutes. That takes 2 capscrews, 2 oval head cap screws, remove GB cover, 2 hex standoffs, & loosening the coupler on the worm. Reinstallation: install GB, tighten 2 hex standoffs, tighten coupler, reinstall GB cover, tighten 1 oval headed capscrews, install motor, tighten 2 cap screws, done.
If you don't move the worm you shouldn't have to worry about the clearance. Check the GB backlash, it may be different than the old GB.
Clear Dark Skies
Clear Dark Skies
Posted 16 January 2013 - 10:00 PM
It was pretty easy, though Losmandy sent me the motors already installed in their gear boxes. I just swapped one set out for the other (again, these are the stepper motors, not Gemini: I don't have Gemini).
And even though it was fairly easy, it took a bit of time to figure out just how to go about it in the easiest way. The old motors were not installed with the same offset system as the new one, and the wiring is different, too. So much so that, unlike with the old wire harness, I found that it worked best to move two of the wires to the other side of the motor in order to get them to fit inside the motor cover.
I figure I'm probably a middle-of-the-road tinkerer. I can figure out how to work things out without instructions or help better than some, but not so well as many I read here. What I think I'm pretty good at is explaining how to do things, especially to folks who maybe are not as good at figuring these things out, or who aren't -- like me and many others -- interested in figuring it out. They just want the instructions.
I've gotten a few thanks already for the Clutch-cleaning post, so that makes it worth it.
I took photos of the motor switching, too, and will probably make another post at my 'blog' (if I can figure out how to not allow comments!)
Posted 17 January 2013 - 02:12 AM
I've read that article, and that's way beyond my skill set!
Posted 17 January 2013 - 12:59 PM
I read that too, I think maybe you got a warped clutch plate. Possibly done when the shaft was installed. I'm fairly handy but THAT mod is out of my league. LOL
Clear Dark Skies
Posted 17 January 2013 - 11:01 PM
But I just checked now, and in the past two days, there have been 250; almost all coming to the article on clutch cleaning!
Posted 20 January 2013 - 02:25 PM
Posted 20 January 2013 - 10:20 PM
I own an Orion Atlas (their version of the EQ6), and it does have go-to capability, which for many (most?) folks is a step up. But I just don't use the go-to, and prefer pushing the scope where I want it to go. The G-11 can also hold significantly more payload, and has much better fit and finish. The G-11 doesn't even seem to notice my 6-inch f/10 refractor, where the Atlas, though it carries it, struggles. The scope weighs about 30 pounds, but is fairly long. I also own a 10-inch reflector, which weighs 40 pounds. The Atlas is right at the edge with it. I haven't put it on the G-11 yet, but I'm confident that it won't have a problem.
Posted 20 January 2013 - 10:51 PM
I bought a G11 about 6 years ago and have been meaning to do a little maintenance.
I've book marked your instruction page, and will give it a try as soon as the warm spring weather arrives.
Posted 21 January 2013 - 10:25 AM
I'm finding that the G-11 is very well designed for user maintenance and upgrades. I just finished making an RA spacer for it. I'll post about that once the paint is dry.