Jump to content


Photo

Which motors for equatorial mount?

  • Please log in to reply
8 replies to this topic

#1 ezio

ezio

    Lift Off

  • -----
  • Posts: 3
  • Joined: 02 Jul 2011
  • Loc: Italy

Posted 04 July 2011 - 03:52 PM

Hello, my name is Ezio and I write from Italy.
I subscribed to your forum not only to share astronomy, but also to learn English (I need it) ...
I'm building an aluminum equatorial mount. The bronze gear has 180 teeth, while the worm is steel.
In the future I'd like to connect the PC to the mount with perhaps starry night, which motors you Recommended: stepper motor, or motors VDC, or Brushless?
The size of the mount are similar to the Losmandy G-11.
Thank you and forgive me for my english :rainbow:

Ezio

#2 JoseBorrero

JoseBorrero

    Gemini

  • *****
  • Posts: 3137
  • Joined: 04 Sep 2009
  • Loc: Puerto Rico Island

Posted 04 July 2011 - 05:38 PM

Welcome to cloudy nights!

As you mention, your mount is like Losmandy. Losmandy sells a retrofit kit for mounts as far as I know there can be others for sure. Good Luck :waytogo:

#3 gdd

gdd

    Apollo

  • -----
  • Posts: 1392
  • Joined: 23 Nov 2005
  • Loc: N Seattle suburb, WA

Posted 04 July 2011 - 11:47 PM

Hi Ezio,

If you choose the Losmandy Gemini-2 retrofit, that will deterime the motors available to you. Either the Losmandy standard dc servo motors or the bigger Maxon dc servo motors. Other motors may be possible, you will need to contact Dr. Rene G. at the Gemini web site.

If you choose the SiTech retrofit, you may be restricted to a different set of motors. Contact SiTech to find out.

Optic-Craft has links to still other clockdrive and GOTO vendors.

Good luck on your project.
Gale

#4 David Pavlich

David Pavlich

    Transmographied

  • *****
  • Administrators
  • Posts: 27205
  • Joined: 18 May 2005
  • Loc: Mandeville, LA USA

Posted 05 July 2011 - 07:40 AM

Hi Ezio,

If you choose the Losmandy Gemini-2 retrofit, that will deterime the motors available to you. Either the Losmandy standard dc servo motors or the bigger Maxon dc servo motors. Other motors may be possible, you will need to contact Dr. Rene G. at the Gemini web site.

If you choose the SiTech retrofit, you may be restricted to a different set of motors. Contact SiTech to find out.

Optic-Craft has links to still other clockdrive and GOTO vendors.

Good luck on your project.
Gale


The SiTech system works with Gemini equipped mounts with either the standard Gemini servos or the Maxon servo motors.

David

#5 Elio_Italy

Elio_Italy

    Explorer 1

  • -----
  • Posts: 78
  • Joined: 25 Mar 2010
  • Loc: Italy, Sabina

Posted 05 July 2011 - 08:24 AM

Ciao, Ezio,
I only can say that my G11 works very well with Astromeccanica stepper motor (DA1 type) and Synscan goto system...

Another cheaper solution could be the rajiva littlefoot vpower with two stepper motor... I used it with my ex GM8, goto only with a pc, but other way I don't know...

I forget before...sorry for my english like Ezio... I never post for this reason... now I win with my ego

#6 avarakin

avarakin

    Surveyor 1

  • *****
  • Posts: 1883
  • Joined: 13 Jul 2009
  • Loc: Parsippany NJ, USA

Posted 05 July 2011 - 11:10 AM

I suggest to subscribe to group called Roboscope on yahoo groups. This group is dedicated to retrofitting Meade DS goto system to different mounts. Your mount could be bigger than what DS system may handle, but I remember seeing pictures of some big scopes driven by DS motors.
Alex

#7 ezio

ezio

    Lift Off

  • -----
  • Posts: 3
  • Joined: 02 Jul 2011
  • Loc: Italy

Posted 05 July 2011 - 02:51 PM

Thanks for your help.
I show you a photo of the base of the mount.
There is still much work to do.
As soon as I finish other pieces, I will show you the progress of work.
Your advices are well accepted.
Hello,
Ezio

Attached Files



#8 ezio

ezio

    Lift Off

  • -----
  • Posts: 3
  • Joined: 02 Jul 2011
  • Loc: Italy

Posted 19 November 2012 - 03:10 PM

Hello, I return after many months to show you the progress of my work.
see the link: http://epsilonphoto....rial-mount.html
I hope you will like and I excuse me if my English contains errors :-)

#9 Geo.

Geo.

    Mercury-Atlas

  • *****
  • Posts: 2773
  • Joined: 01 Oct 2008
  • Loc: Upstate NY

Posted 20 November 2012 - 11:50 AM

Join the PICgoto Yahoo group group, too. They use steppers. Just picked up some bipolar NEMA 23s here (US) for $4 a piece.






Cloudy Nights LLC
Cloudy Nights Sponsor: Astronomics