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CGEM RA is hard to adjust

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7 replies to this topic

#1 Tim Kimbler

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Posted 19 September 2019 - 09:01 AM

Folks I have a CGEM in perfect condition.  My issue is the RA is difficult to adjust when polar aligning.  It's very stiff and hard to move.  Anyone have a solution or recommendation?  I guess some type of plate or pads.  Thanks     



#2 mich_al

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Posted 19 September 2019 - 09:11 AM

I bought a sheet of plastic from ScopeStuff (http://scopestuff.com/ss_poly1.htm) and cut it to fit, works great.  I hear that the same made from a plastic milk container works too.  Or maybe just smooth both surfaces with fine sandpaper will make a big difference.



#3 petert913

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Posted 19 September 2019 - 09:34 AM

Is the RA used in polar alignment?  I use only Alt and Az adjustments.  If it is AZ we are talking about

then yes, a teflon slip sheet would help.



#4 dcollier

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Posted 19 September 2019 - 09:41 AM

I sanded mine with 400 grit sandpaper on both surfaces and then used stick drawer lubricant, problem solved. 

 

            -Dave 



#5 darkcloud

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Posted 19 September 2019 - 11:50 AM

I don't have a CGEM, but on other mounts I have used, I put a couple of CD's between the plates.  Don't know if the center will fit the CGWM or not, but it quick and cheap if it does.


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#6 Tim Kimbler

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Posted 19 September 2019 - 02:33 PM

Fabricating a slip plate seems like a good idea.  I ordered a sheet of UHMW from Amazon, 12x12,1/8.  Thanks for the suggestions everyone.  



#7 eacmen

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Posted 19 September 2019 - 05:34 PM

Fabricating a slip plate seems like a good idea. I ordered a sheet of UHMW from Amazon, 12x12,1/8. Thanks for the suggestions everyone.



I did the same thing but with thinner Teflon sheet. I only needed to use one. Two would probably be smoother though.


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#8 KLWalsh

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Posted 20 September 2019 - 10:04 PM

I find that loosening the main 12 mm threaded mount attachment rod just a bit makes adjusting AZ a lot easier. Once PA is set I retighten the 12 threaded rod, then tweak the PA once more if needed. Usually only ALT needs tweaking, if any is needed.

Likewise if I do ASPA I will temporarily loosen the 12mm rod, and carefully retighten when I’m done.


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