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Equipment Discussions >> Mounts

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pdxmoon
scholastic sledgehammer
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Reged: 06/27/13

Loc: Oregon
Anyone Repair Mounts?
      #5980496 - 07/19/13 09:05 PM Attachment (28 downloads)

Astro Friends:

I have an old Celestron Firstscope 80mm f/11 that came with a very sturdy clamshell type EQ mount.

The RA mechanism slow mo controls froze. In taking it apart I see the teeth are stripped.

I'm not sure if it can, or even should be fixed, but it would fit in a priority mail box and I'd be happy to try. It was a very sturdy mount for me, and before I just use the wooden legs on something else, I thought I'd ask y'all.


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orlyandico
Postmaster
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Reged: 08/10/09

Loc: Singapore
Re: Anyone Repair Mounts? new [Re: pdxmoon]
      #5980824 - 07/20/13 02:35 AM

I have several mounts with the teeth screwed like that. Basically you are SOL. The teeth on that gear are made of some pot metal and tend to strip, break, the whole gear cracks, etc. And you can't buy a replacement.

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beanerds
sage


Reged: 07/15/08

Loc: Darwin Australia
Re: Anyone Repair Mounts? new [Re: orlyandico]
      #5980912 - 07/20/13 05:25 AM

If it was me I would look for a used EQ3 , CG4 , mount .
Yes the older EQ2's are a good mount but as already said , the gears are not made of good material , its a
'Zinc Diecast' type that's hard to do any thing with , sorry to say.
Keep an eye out for one of the above 2nd hand , even new a EQ3/CG4 is only $300 ? your OTA is worth it .
Good luck .
Brian.


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beanerds
sage


Reged: 07/15/08

Loc: Darwin Australia
Re: Anyone Repair Mounts? new [Re: beanerds]
      #5980914 - 07/20/13 05:32 AM

Oh yes I forgot , I have one of these with a single axis drive under my Coranado SolarMax40 , perfect mount for this OTA .
I see that the damage is not central to the gear ? , I shimmed mine out by using a couple of 6mm washers under the holder that holds the 'Worm'. that put the worm in the centre of the gear and made it a whole lot better to set up the backlash and feel during use .
Brian.


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Brent Campbell
sage


Reged: 02/09/10

Loc: Olympia, WA
Re: Anyone Repair Mounts? new [Re: pdxmoon]
      #5980988 - 07/20/13 08:21 AM

There are on line companies that sell gears. I just googled and found this one: http://www.arrowgear.com/stock_gears/stock_gears.html

If you can take the mount apart easily and get the defective gear off, then you may be home free. Another thought is to take the thing to a machine shop. That would be child's play for a talented machinest.

Like the other posters said the problem may be cost. I have a celestron CG-4 that only cost me $125.00. If you choose to repair it you will probably sink more into the mount than its worth.

Oh and pot metal is notorious for corroding like that! My other hobby is O gauge trains and that is a problem for antique trains as well.


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orlyandico
Postmaster
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Reged: 08/10/09

Loc: Singapore
Re: Anyone Repair Mounts? new [Re: Brent Campbell]
      #5981071 - 07/20/13 09:35 AM

That's an EQ-1, EQ-2 at best. Well under $100, even under $50. So really not cost-effective to repair.

I took apart my EQ-1 and removed the pot metal gear, it is doable, but really not worth the effort.


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rmollise
Postmaster
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Reged: 07/06/07

Re: Anyone Repair Mounts? new [Re: orlyandico]
      #5981109 - 07/20/13 09:54 AM

These gears are aluminum, usually. "Pot metal" hasn't been used by even the most thrifty Asian manufacturers in decades.

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pdxmoon
scholastic sledgehammer
*****

Reged: 06/27/13

Loc: Oregon
Re: Anyone Repair Mounts? new [Re: rmollise]
      #5981500 - 07/20/13 02:07 PM

Thanks. I'll keep my eyes on the lookout for a used CG4. I only have one mount and it would be fun to set up side by side.

I may have a Porta II coming my way and may be able to use the nice wooden tripod legs from this mount on that.

Edited by pdxmoon (07/20/13 02:10 PM)


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Jon Isaacs
Postmaster
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Reged: 06/16/04

Loc: San Diego and Boulevard, CA
Re: Anyone Repair Mounts? new [Re: pdxmoon]
      #5982166 - 07/20/13 10:52 PM

Quote:

I'm not sure if it can, or even should be fixed, but it would fit in a priority mail box and I'd be happy to try.




Carefully clean up the damage with a thin tapered file. Reassemble it, it might work. If it doesn't, it is still useable if you can keep track of where the damage section is and avoid using it.

Jon


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pdxmoon
scholastic sledgehammer
*****

Reged: 06/27/13

Loc: Oregon
Re: Anyone Repair Mounts? new [Re: Jon Isaacs]
      #5983046 - 07/21/13 01:45 PM

Trouble is, the entire RA gear is locked frozen; I cannot get it to move at all. It seems to have seized.

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orlyandico
Postmaster
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Reged: 08/10/09

Loc: Singapore
Re: Anyone Repair Mounts? new [Re: pdxmoon]
      #5983056 - 07/21/13 01:58 PM

if you prise off the thin metal or plastic plate covering the RA axis (where a polar scope would go on a bigger mount) you'll notice that the RA axis is hollow and there's a big nut inside that holds the gear in place.

if you can remove this nut, you can then pull out the entire RA gear. or the nut could be overtightened which is what has seized the RA axis.

again, this is only worth doing if you don't value your time at all. :P


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Geo.
Carpal Tunnel
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Reged: 10/01/08

Loc: Upstate NY
Re: Anyone Repair Mounts? new [Re: orlyandico]
      #5983816 - 07/21/13 11:12 PM

There's a CG-3 on ebay now going for $20 or so, looks like a good part source. But in good shape the mount's worth $50 tops, so I wouldn't go too deep.

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