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Equipment Discussions >> Mounts

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Jarrod
Pooh-Bah
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Reged: 01/20/13

Loc: SE USA
Help fixing a CG-2
      #5789769 - 04/10/13 08:34 AM

My friend has a Celestron 114eq with a broken CG-2 mount. The part that is broken is the bracket that couples the mount head to the tripod. I have the impression that he doesnt wish to replace the mount, but rather find an inexpensive fix. Are these parts available? Any ideas I could share with him?

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buddyjesus
Carpal Tunnel
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Reged: 07/07/10

Loc: Davison, Michigan
Re: Help fixing a CG-2 new [Re: Jarrod]
      #5791191 - 04/10/13 08:07 PM

can i see a picture? Might be able to use cold weld and fix it.

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Jarrod
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Reged: 01/20/13

Loc: SE USA
Re: Help fixing a CG-2 new [Re: buddyjesus]
      #5791599 - 04/10/13 11:53 PM

I think he said the broken part has gone missing.

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Geo.
Carpal Tunnel
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Reged: 10/01/08

Loc: Upstate NY
Re: Help fixing a CG-2 new [Re: Jarrod]
      #5795233 - 04/12/13 07:09 PM

I may have the part, but a photo is really needed to properly ID the mount.

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Jarrod
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Reged: 01/20/13

Loc: SE USA
Re: Help fixing a CG-2 new [Re: Geo.]
      #6081916 - 09/15/13 11:45 AM Attachment (6 downloads)

I finally got a pic from my friend.

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orlyandico
Postmaster
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Reged: 08/10/09

Loc: Singapore
Re: Help fixing a CG-2 new [Re: Jarrod]
      #6081939 - 09/15/13 11:59 AM

pot metal strikes again! :P

i don't think that can be welded - it's aluminum or something. a replacement polar fork may be had from George. or, try to fabricate a new polar fork from some aluminum angle.


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Jarrod
Pooh-Bah
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Reged: 01/20/13

Loc: SE USA
Re: Help fixing a CG-2 new [Re: orlyandico]
      #6083066 - 09/16/13 12:11 AM

I think he already tried JB Weld. No dice.

There are ways to actually weld aluminum, but I am not sure if they apply to cast parts, or not...


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Geo.
Carpal Tunnel
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Reged: 10/01/08

Loc: Upstate NY
Re: Help fixing a CG-2 new [Re: Jarrod]
      #6083710 - 09/16/13 11:24 AM

Not really pot metal which is die cast zinc. This is likely an aluminum alloy casting. Nevertheless, still very difficult to weld and even more difficult to join accurately. The brittleness of alloy castings is a factor of how much silica is added to the mix. The most common cast aluminium alloy system is Al–Si, where the levels of silicon 4.0 to 13%. The higher levels give good casting characteristics, but weaken the final product. The silica levels in cheaper Chinese products seem to be even higher as machining them dulls tooling quickly.

The part looks to be from a EQ-2/CG-3. These mounts trade for about $45. I don't have any spare parts for them and if I did I'd be looking for $25 for the part. Seems to make more sense to replace the mount. I can allow you something in trade on the damaged mount. Get me a PM if interested.


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