Re: ATM Motor control

[Brian Nestel <blast@aloha.net>]

Rob Simmons wrote:
> 
> I have a german equatoral mount tha i have built on my own... I would like
> to put a drive on the decl. axis so i can track. My problem is that i cannot
> find a drive that will actually turn at 15 degrees/hour (the speed the earth
> turns) So i came to the conclusion that i need to attach a "belt" to the
> drive to turn a larger circle. Does anyone know what the deminsions have to
> be???.. Both the speed of the drive and the circumfrence of the second
> circle?... if anyone knows of a motor that turns at 15 degrees/hour that i
> can purchase then PLEASE tell me where.!!!
Hi:
You want to drive your mount in Right Ascension not Dec., not seeing your
mount its hard to make a recommendation, but usually you drive it with
a ring and worm gear combination or with a sector gear and a geared down
motor or stepper. Sometimes Telescope Warehouse on astromart
http://www.astromart.com/telescope_warehouse.html
or Apogee
http://www.astronomy-mall.com/regular/products/apogee/
have some gearing or motors that you maybe able to use.

also here are some links to various projects that may help you
visualize what you need for your mount.
http://www.detray.com/jeff/eq/
http://webpages.metrolink.net/~dholko/eqmount.htm
http://www.fred.net/bdavy/Newscope.htm
http://easyweb.easynet.co.uk/~chrish/eqnotes.htm

-- 
Aloha   159 30 W, 21 55 N
Brian   Middle of the Pacific,
_________________________________________________________
|         NESCOMP         |          K.E.A.S.A.         |      
|    Computer Services    |Kauai Educational Association| 
| Box 73, Lawai, HI 96765 |  for Science and Astronomy  |          
| Voice/Fax 808-332-7709  |  Box 161, Waimea, HI 96796  |
|     blast@aloha.net     |                             |

"Television? The word is half Greek and half Latin.
 No good will come of it."
 C.P. Scott, editor of the Manchester Guardian 1928