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Equipment Discussions >> Mounts

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drksky
Carpal Tunnel
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Reged: 09/01/09

Loc: Bloomington, IL
CGEM - Play in the RA Axis new
      #5694542 - 02/22/13 11:53 AM

I recently purchased a used, hyper-tuned CGEM that while tracks well and is very smooth, has a lot of play in the RA axis. What can I do to eliminate this play? Does the worm need adjusted? Any guides for doing that on a CGEM?

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DaveJ
Carpal Tunnel
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Reged: 01/07/05

Loc: NE Ohio
Re: CGEM - Play in the RA Axis new [Re: drksky]
      #5694580 - 02/22/13 12:14 PM

Quote:

...What can I do to eliminate this play? Does the worm need adjusted? Any guides for doing that on a CGEM?




Here you go - worm/wormgear adjustments. These instructions are specifically for an Atlas/EQ6, but the method for the CGEM is identical.


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Raginar
Postmaster
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Reged: 10/19/10

Loc: Rapid CIty, SD
Re: CGEM - Play in the RA Axis new [Re: DaveJ]
      #5694992 - 02/22/13 03:34 PM

Tony, go to the CGEM yahoo group. There is specific instructions on adjusting the CGEM worm on there. It is similar, but I like seeing the CGEM info .

I can't remember how much play my CGEM had... did you try just balancing it heavy to the meridian you're imaging in?


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drksky
Carpal Tunnel
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Reged: 09/01/09

Loc: Bloomington, IL
Re: CGEM - Play in the RA Axis new [Re: Raginar]
      #5695040 - 02/22/13 03:54 PM

I wasn't really doing any imaging. I had my LS80 on it and the image was jumping out of the FOV while I was trying to adjust the tuning. I can grab the CW shaft and wiggle it more than I think I should.

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John O'Grady
member
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Reged: 11/15/09

Loc: Waterloo, ON CAN
Re: CGEM - Play in the RA Axis [Re: drksky]
      #5695737 - 02/22/13 10:04 PM

I had similar play in the RA on my CGEM that I resolved by adjusting the worm gear. Mount has performed much better since making the adjustment.

Fortunately your mounts already been hypertuned. For those reading this that have a CGEM and want to adjust the worm gear, read this warning caution from Ed Thomas (happened to me):
http://tech.groups.yahoo.com/group/CelestronCGEM/message/7756

Unfortunately I found Ed's post after performing the worm gear adjustment. Live and learn.


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