Need help with Celestron AVX!
Posted 15 January 2014 - 09:30 PM
Posted 16 January 2014 - 12:01 AM
Posted 16 January 2014 - 10:09 AM
Posted 16 January 2014 - 01:26 PM
In addition to John L.'s suggestion, make sure the bolt that holds the head on the tripod is tight, if it is loose the head will wobble in azimuth. As for reticles eyepieces yes they are worthwhile for alignment, 12mm or so is a popular focal length. Orion has a centering eyepiece with a of about 20mm fl with a 70 degree FOV that might work very well for aligning. Good Luck!
Posted 17 January 2014 - 05:21 PM
Posted 17 January 2014 - 06:48 PM
Posted 17 January 2014 - 08:03 PM
You are right, it will wobble when the center fixing bolt is loose. The adjustment knobs aren't meant to fix it in place. Line it up, tighten the fixing bolt.
Posted 17 January 2014 - 08:23 PM
Posted 18 January 2014 - 04:35 PM
I've tightened down everything but it still is shaky.
Did you check to see if the azimuth pag is tight as suggested above? The azimuth adjusting screws press on a peg that is screwed into the mount base. If the scope still moves with both the azimuth adjusting screws tight against the peg, it either has to be a loose center bolt or a loose azimuth peg. Those are really the only degrees of freedom. If you've tightened the center bolt, that only leaves the azimuth peg.
Posted 18 January 2014 - 04:38 PM
Is the fixing bolt bottoming out before it has a chance to clamp?
Check the alignment pin again....
Perhaps it is time to break out a dial indicator and start looking around to find out exactly where the play is coming from...
Can you post a pic of where you think the play is? Can you see the gap in the mounting surface?
Are you only seeing it when looking through the scope? Are you tightening the clutches sufficiently? The dovetail clamp?
Posted 18 January 2014 - 04:38 PM
Posted 18 January 2014 - 04:40 PM
REALLY stupid question, but you are sure you have the head seated on the baseplate correctly?
Posted 18 January 2014 - 04:45 PM
Posted 18 January 2014 - 06:54 PM
Posted 20 January 2014 - 07:19 PM
Posted 20 January 2014 - 08:01 PM
Posted 21 January 2014 - 07:46 AM
Posted 21 January 2014 - 09:27 AM
I just tried that, It was like pouring gasoline on a fire. It gave it free range of motion.
That makes it pretty obvious that your center bolt is not clamping the mount head to the tripod with enough (or any) force. If it were you would not be able to budge the mount head. Something is preventing the center bolt from clamping properly. Even if the center bolt seems tight it's not clamping which means something is bottoming out before the center bolt can clamp the mount head to the tripod base. You should be getting a good clamp force on the center bolt whether the spreader bar is attached or not.
Take some PICTURES! That would really help us see what's going on. It's not that complicated and should be an easy fix what ever it is.
Posted 21 January 2014 - 09:45 AM
One other potential problem area is that the threads on the center bolt may be bottoming out in the mount head. This could happen if the hole is not deep enough. Try putting a washer between the bottom of the tripod head where the center bolt clamps on the underside of the tripod and the center bolt 'stop'. To do this you will need to unthread the center bolt from tripod head, add the washer and screw it back into the tripod head.