ETX 80 issue
Posted 13 October 2012 - 03:28 PM
Here's a picture of the rear port with the t-thread adapter:
I started trying to disassemble the base so that I could remove the tube, and hopefully take the separate the back end of the tube from the rest of the scope so I could fix the issue.
However, I can't the white plastic thing in the following picture off:
Any tips on how to get this thing off?
If anybody has any other suggestions for getting at the threads for the rear port, I'd also appreciate though.
Posted 13 October 2012 - 04:21 PM
Posted 13 October 2012 - 04:37 PM
The white thing unscrews. The rear port staks are always a problem. I fixed mine with a few drops of super glue. You could also leave it in place and get a thread cap.
Thanks for the reply Stew57.
I'll give unscrewing it a try..
Posted 13 October 2012 - 05:01 PM
Anybody have any more pointers?
Here are the two pieces I'm trying to get apart now:
Posted 13 October 2012 - 08:05 PM
Posted 13 October 2012 - 11:13 PM
I have removed the rear screws and the focuser shaft with the front half of the tube, but the tube just slide a little bit and then catches on something.
I'm trying to get to the inside of the metal insert with the threads for a back cell so that I glue it in place and eventually get the t-thread adapter off.
Posted 13 October 2012 - 11:40 PM
Here you go
Posted 14 October 2012 - 11:46 AM
Did you take your focuser knob off? I'm going to try to see if I can do what you did to get the t-adapter off.
Posted 14 October 2012 - 12:36 PM
I've now just finished adding some more superglue around the edge of the threaded portion. I'll let that sit for bit before I trying to reassemble everything...
Thanks for your help so far Mark! It's very much appreciated.
Posted 14 October 2012 - 02:20 PM
After reassembly, I'm getting a motor failure. The scope moves find in the altitude direction, but not at all in azimuth. I suspect I've either got the azimuth clutch too tight, or not tight enough.
Posted 14 October 2012 - 10:26 PM
Does the motor work while trying to slew?
It sounds like the motor is running, but the scope doesn't move. I'm trying to figure out how to troubleshoot the issue when I can't see inside the base.
I suspect that the worm is actually turning the gear, but the gear isn't locked to the shaft properly for some reason.
Posted 14 October 2012 - 10:39 PM
Posted 14 October 2012 - 10:48 PM
Posted 15 October 2012 - 10:48 PM
Snap the bottom cover off and see if the gear is turning.
Hmm, I can't seem to figure out how to do that. I've undone the screws that hold the bottom to the steel plate in the base, but I can't seem to get the cover off while leaving the gear in place.
Posted 15 October 2012 - 11:16 PM
Posted 18 October 2012 - 05:58 AM
Tghere is a small round button cover see your pic above showing the white castle nut. You can see if the gear is turning through the space next to the clutch fingers.
Thanks Mark, I'll give that try.