Return to the Cloudy Nights Telescope Reviews home pageAstronomics discounts for Cloudy Nights members
· Get a Cloudy Nights T-Shirt · Submit a Review / Article

Click here if you are having trouble logging into the forums

Privacy Policy | Please read our Terms of Service | Signup and Troubleshooting FAQ | Problems? PM a Red or a Green Gu… uh, User

Equipment Discussions >> Mounts

Pages: 1

Reged: 06/23/10

I may have ruined my CG5
      #3883997 - 06/24/10 04:11 PM Attachment (78 downloads)

I think I have ruined my Celestron CG5 mount.

I purchased a teflon bearing set and Superlube for hypertuning the mount. First, I dismantled the Declination Axis and found several loose bolts and lot of sticky grease. I cleaned all the components placed the teflon bearings as advised and lubricated with superlube and assembled the axis, everything went very smoothly and now the Dec Axis is working better than before.

But things started getting wrong when I opened the RA axis, and I thought it was the easy part. Actually the RA axis has to bear all the weight that is put on the mount, that I learned the hard way, moreover the Ball-bearing had a slight wobble that I realized after I assembled the mount. With the counterweight and the scope attached, the RA axis suddenly started screaming and then stopped altogether. I quickly shut it off, and dismantled the mount again and found that the RA Axis shaft was bitten by the metal ring at the level of thrust ball-bearing. I cleaned it, made a few adjustments and assembled everything again, this time tightening the locking ring a bit further. At first everything looked fine but then again screaming and locking. I opened it again and found a complete ring of biting in the metal in the axis shaft. (photo attached).

Now I am lost, I dont know what to do. Should I replace the large Ball bearing or put back the plastic bearings and how to repair the shaft? Any help?

Post Extras: Print Post   Remind Me!   Notify Moderator  
Carpal Tunnel

Reged: 11/19/06

Loc: San Tan Valley, Az,
Re: I may have ruined my CG5 new [Re: Farrukh]
      #3884200 - 06/24/10 05:50 PM

Not sure how this could have happened The bearing race probably could be sanded with a 400 paper carefully..

Seems like the bearing is not seated correctly and the allens are scraping the race somehow My guess

Pm me if you want help with it. I have stripped down many mounts Atlas, Serious, CG-5 and LXD75


Edited by Gregk (06/24/10 06:21 PM)

Post Extras: Print Post   Remind Me!   Notify Moderator  

Reged: 06/23/10

Re: I may have ruined my CG5 new [Re: Gregk]
      #3885688 - 06/25/10 01:37 PM Attachment (35 downloads)

Thanks for your comments. Today I went to a local machinist friend of mine and he suggested a solution. A bearing is available with the same specs as the shaft and inside of the RA-housing. The size is 35x47x7mm and the bearing number is 6807zz. He will prepare the seat for the new bearing tomorrow. Also the big bearing #6007 is to be replace with a better Japanese one. Hopefully I will be able to assemble the mount tomorrow and will report its working in a few days.

Thanks again.

Post Extras: Print Post   Remind Me!   Notify Moderator  
Pages: 1

Extra information
32 registered and 31 anonymous users are browsing this forum.

Moderator:  Dave M, richard7, bilgebay 

Print Thread

Forum Permissions
      You cannot start new topics
      You cannot reply to topics
      HTML is disabled
      UBBCode is enabled

Thread views: 881

Jump to

CN Forums Home

Cloudy Nights LLC
Cloudy Nights Sponsor: Astronomics