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CharlesW
scholastic sledgehammer


Reged: 11/02/12

Loc: Chula Vista & Indio, CA
Balance CPC 800
      #5590580 - 12/27/12 12:13 AM

I was trying to image Jupiter the other night using my DSLR and liveview. The video at times was a little jerky and I think it's because of a weight problem I've got six pounds of stuff on top of my OTA. I've read Starizona's balancing page. Has anyone come up with a nice home-brewed solution for balancing a CPC?

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Larry F
Carpal Tunnel
*****

Reged: 05/24/04

Loc: Westchester, NY
Re: Balance CPC 800 new [Re: CharlesW]
      #5591782 - 12/27/12 08:40 PM

If the scope is back-heavy, use a rail and a counterweight. You can slide one or more counterweights to balance accurately. I use ScopeStuff's rails and weights.

If it's front-heavy, you'll need to jury-rig weights to the grip on the mirror housing.


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Gastrol
Pooh-Bah


Reged: 11/04/11

Loc: los angeles
Re: Balance CPC 800 new [Re: Larry F]
      #5591814 - 12/27/12 08:56 PM Attachment (75 downloads)

Here's my DIY solution:

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MikeBOKC
Post Laureate
*****

Reged: 05/10/10

Loc: Oklahoma City, OK
Re: Balance CPC 800 new [Re: CharlesW]
      #5591856 - 12/27/12 09:42 PM

If you are a bit too backheavy (the CPCs are naturally backheavy out of the box, but more accessories on the back end can tip that over into a realm where balance affects performance) the simplest solution is to add a dew shield, which also has the benefits of suppressing dew and shielding ambient light. Beyond that, the bottom counterweight systems offered by ADM and others do the trick nicely.

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barbarosa
scholastic sledgehammer


Reged: 04/11/10

Loc: "lamorinda", CA
Re: Balance CPC 800 new [Re: CharlesW]
      #5592790 - 12/28/12 02:34 PM

Here is my thread on a washer/T Bar system using hardware store parts. I just made new brackets and refited it to a CPC1100.

I favor a DIY dewshield made from Reflectix, but when I need to use an Astrozap shield, there is a significant forward CG shift.

The CPC mount will handle a substantial extra payload, however I speculate that having everything in balance will extend the life of the motors and gears. I can't say that tracking and go-to accuracy is improved (at least with a moderate extra load).


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Digital Don
Carpal Tunnel
*****

Reged: 01/20/04

Loc: Manteno, IL
Re: Balance CPC 800 new [Re: Gastrol]
      #5593457 - 12/28/12 10:29 PM

Hi Gastrol,

Nice setup! What did you use as mounting blocks?

Don


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CharlesW
scholastic sledgehammer


Reged: 11/02/12

Loc: Chula Vista & Indio, CA
Re: Balance CPC 800 new [Re: Digital Don]
      #5593513 - 12/28/12 11:04 PM

My problem is I'm very front heavy with a 65mm refractor and the ADM plate to support it. I do like the Rockler T Track but I'm thinking that I'll have to extend it out the back some.

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barbarosa
scholastic sledgehammer


Reged: 04/11/10

Loc: "lamorinda", CA
Re: Balance CPC 800 new [Re: CharlesW]
      #5593754 - 12/29/12 03:04 AM

Quote:

My problem is I'm very front heavy with a 65mm refractor and the ADM plate to support it. I do like the Rockler T Track but I'm thinking that I'll have to extend it out the back some.



It does come in 24" and I think it will clear the grab handle, so you can make a test before you cut the track. The track looks sturdy enough to stand a modest cantilever load.


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ariesangel
newbie
*****

Reged: 04/11/11

Re: Balance CPC 800 new [Re: Gastrol]
      #5827573 - 04/28/13 12:42 AM

Where did u get rail and small mounts? Please

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