AVX backlash adjustment help needed
Posted 02 September 2013 - 09:52 PM
Posted 03 September 2013 - 01:28 AM
at the bottom of this page shows the DEC worm gear mount for the CG-5
to help get a better idea of how to properly adjust a worm gear try this guide made for the HEQ5 mount, the AVX is probably not at all similar to this mount but the advise in it applies to any mount really and will give you a better idea of what to look for when looking for adjustment screws and lock screws.
and here is a video i just found where a guy adjusted the gear-mesh going from the drive motor to the worm gear. judging by what i see there the worm drive system is VERY similar to the CG-5.
hope it helps, if you get stuck somewhere post up some pictures or wait for others with an AVX that have done the job before to respond, I have only adjusted my CG-5 and my Club's Sirius mount (HEQ5)
Posted 03 September 2013 - 02:42 AM
The worm gear/ring gear adjustment is easily done and very similar to the CG-5 adjustment Dwayne posted. You also need to check the worm gear end play before you adjust the worm gear. This is also shown on the CG-5 site posted. If you have any trouble, give me a pm and I can help walk you through it.
Posted 03 September 2013 - 08:55 AM
Seriously, thanks. I at least now know what's causing the backlash problem. I've had this backlash issue from day one; it sure seems like something that could have been taken car of by Celestron before the sent it out. Or maybe it's just an inherent problem with all goto GEMs.
Posted 03 September 2013 - 09:30 AM
If you buy a higher end mount like an AP, Tak, Losmandy etc. your less likely to see such an issue because they are all made to tighter tolerances and are far less mass produced, in fact many are made by small shops that take their time on them. but you get what you pay for.
it really is not a hard proceedure even for someone not very adept at mechanical things and the only tools you should need are screw drivers and a metric hex key set.
if you wish for someone to do the work for you then these folks can do it for you
he lurks around here as well so perhaps you could contact them and see what they would charge just for a mesh adjustment if you don't want them to do the complete overhaul job on the mount.