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Equipment Discussions >> ATM, Optics and DIY Forum

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foste1cc
super member


Reged: 01/06/13

Loc: Armada, MI
Motor Focus
      #5633030 - 01/20/13 11:35 AM

Hey everyone. I was just wondering if any of you know of cheap motor focuser that will fit and work well with a Celestron SCT Nexstar 8SE. I see that celestron makes an electronic motor focuser made specially for this telescope but costs $180. I see that orion and a couple others make much cheaper focusers. Do any of you know of cheaper focusers that will work for me?? I can't stand the shaking/vibrations anymore!! thanks in advance guys!

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herrointment
Post Laureate
*****

Reged: 03/12/11

Loc: North of Hwy. 64
Re: Motor Focus new [Re: foste1cc]
      #5633165 - 01/20/13 01:00 PM

emediadesigns.com/focuser/

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foste1cc
super member


Reged: 01/06/13

Loc: Armada, MI
Re: Motor Focus new [Re: herrointment]
      #5633240 - 01/20/13 01:33 PM

This looks like a great idea and fun project. Thanks a bunch for the reply and help! the video looks like it works just as good as the expensive ones

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StarDusty
sage


Reged: 10/02/07

Loc: Parsippany, NJ
Re: Motor Focus new [Re: foste1cc]
      #5633357 - 01/20/13 02:43 PM

Nice and simple. Great idea.

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herrointment
Post Laureate
*****

Reged: 03/12/11

Loc: North of Hwy. 64
Re: Motor Focus new [Re: StarDusty]
      #5633864 - 01/20/13 08:10 PM

I built one and I would be lost without it.

Actually I've built 3 and can say that the mini-servo has the ideal speed range once you get the pulleys sized correctly. Higher torque models cause unnecessary headaches.


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Gene7
scholastic sledgehammer


Reged: 06/10/10

Loc: Mid Ohio, USA
Re: Motor Focus new [Re: herrointment]
      #5633889 - 01/20/13 08:26 PM

I would put it on a real telescope though, not a SCT. Gene

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herrointment
Post Laureate
*****

Reged: 03/12/11

Loc: North of Hwy. 64
Re: Motor Focus new [Re: Gene7]
      #5633925 - 01/20/13 09:01 PM

I actually use mine to control the temperature of my heating pad.....no more bending!

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WarmWeatherGuy
Carpal Tunnel
*****

Reged: 08/27/11

Loc: Orlando, FL 28° N, 81° W
Re: Motor Focus new [Re: foste1cc]
      #5634715 - 01/21/13 11:00 AM

You might be interested in this YouTube video How to Focus a Wobbly Telescope. A Bahtinov mask may be all you need.

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Geo.
Carpal Tunnel
*****

Reged: 10/01/08

Loc: Upstate NY
Re: Motor Focus new [Re: WarmWeatherGuy]
      #5635856 - 01/21/13 10:30 PM Attachment (11 downloads)

Love the Shack when I can't wait, but check out the Electronic Goldmine.com for parts at a fraction of the Shack's prices. http://www.goldmine-elec.com/

I think a gear head motor will be easier to get good results with as there's less a tendency to cog at the higher speeds you can run it.

This Goldmine Mini Gearhead Motor Sayama 12SM-AT3 looks to be the same one used in Meade's ETX focusers. Item G16300.


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akawaka
member


Reged: 08/02/11

Loc: Calabasas, CA
Re: Motor Focus new [Re: Geo.]
      #5639590 - 01/23/13 09:29 PM

I'm working on something like Brian Sumpters design, I'll post some details once I'm done. I couldn't find a micro continuous servo and didn't want to mod my own so I got a slightly bigger size which means I'll probably have to rig up some kind of mounting plate to mount the servo upside down. For the control hardware I'm using an arduino micro because I want to be able to control this over USB also.

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