Attention Orion EON owners please
Posted 03 January 2013 - 09:45 PM
I've had my EON for under a year and only recently tried to rotate the focuser. I haven't been able to get the silver knurled ring lose to even attempt it. I've tried it in warm weather, cold weather, with gloves and I was even thinking of using one of those strap wrenches to attempt to loosen it. I've called Orion and they said I could send it back but I was unclear as to whether they are going to replace it, fix it, or whatever... point being I really like it and would rather not go through the trouble of sending it back. As much as I don't think I would even rotate it, I don't want to have a problem down the line if I decide to sell it. As much as I love it though, who wouldn't want to have used it for almost a year and get something else...
Anyways, any ideas how to loosen it? I did see on another thread about focusers about heating it up with a propane torch, but I don't think I'll go that far. Any suggestions would be appreciated otherwise I'll be sending it to Orion on Monday.
Posted 03 January 2013 - 09:51 PM
Please don't take a torch to these wonderful scopes.
Posted 03 January 2013 - 11:04 PM
Posted 03 January 2013 - 11:13 PM
Posted 04 January 2013 - 01:03 AM
Posted 04 January 2013 - 07:23 AM
try with minimal pressure turning it opposite of the orientation you "think" it should go
I did try this, but it's clearly marked on the OTA which way is supposed to lock it and unlock it. I also asked the question to Orion over the phone. Thanks for the suggestions everyone.
Posted 04 January 2013 - 09:23 AM
Posted 04 January 2013 - 09:52 AM
Posted 04 January 2013 - 10:20 AM
To get the focuser off, and you do have to loosen the chrome ring to do that, the key is to apply even and steady pressure. It seems you have already tried this. To get even and steady pressure on the tube and focuser I would suggest that this should be a two man operation. So far if it is just you it is very hard to have pressure evenly applied around the circumference of the scope on the rings. Get a second person holding the tube steady with his or her hands around the tube. Using both of your hands and steady pressure, try to loosen the focuser (do not put pressure on the pinion shaft as you may damage that). Unscrew counter-clockwise, as viewed from the rear. If that does not work, try again after applying heat to the chrome ring, via a hair dryer. This should work.
The rotating focuser on the EON basically works the same way as does the focusing adjustment on many finder scopes - i.e. - threaded ring goes onto the threaded front end of a finder tube followed by a threaded cell holding the objective. When the two are brought together, they lock together at that point and uneven pressure prevents turning of both together on the threads.
Another possible way to skin the cat: You will notice a recessed allen screw on the focuser, bottom side, very near the chrome ring. If you loosen this the focuser (black part) will not "fall off". What this screw does is it fixes an internal tube with what looks like a pressure plate in place. As viewed from the front this part has two spanner holes and it can be loosened with an appropriate tool. However if the problem is this plate jammed against the chrome ring or the part the chrome ring screws on to, loosening the allen screw should allow you to unscrew the focuser pressure plate by turning the focuser body counter-clockwise. That could relieve some pressure between the chrome ring and interface part on the telescope tube, allowing you to unscrew that part too.
I would apply Sil-Glyde (or something equivalent) to the threads. It will give everything a nice hydraulic feel, prevent galling and jamming such as what you are seeing, and make focuser rotation noiseless.
Best of luck!