Announcements and News
Cloudy Nights Announcements
Discussion of CN Articles, Reviews, and Reports
General Observing and Astronomy
ATM, Optics and DIY Forum
Cats & Casses
Video and Electronically Assisted Astronomy
Astrophotography and Sketching
Beginning and Intermediate Imaging
DSLR & Digital Camera Astro Imaging & Processing
CCD Imaging & Processing
Solar System Imaging & Processing
Astro Imaging/Sketching Contest
Solar System Observing
Deep Sky Observing
Double Star Observing
Solar Observing and Imaging
Variable Star Observing and Radio Astronomy
Telescope Specific Forums
Celestron NexStar, NexStar GPS, CPC
Astronomy Shows & Conferences
Astro Art, Websites & Other Media
Astronomy Clubs and Star Parties
Astronomy Software & Computers
Books, Star Charts & Stellar Media
Science! Astronomy & Space Exploration, and Others
The Off Topic Observatory
Off Topic Observatory Games
Cloudy Days & Microscopes
Cameras & Photography
Swap and Shop
S&S Misc Astro
S&S Information for New Members
CN Feedback and Vendor Announcements
Vendor and Group Announcements
International Year of Astronomy 2009 - Forums are now closed.
IYA Archive Info
Articles and Columns
/ Updated Schaefer Mount
Updated Schaefer Mount
March 25, 2011 1:50 PM
I have updated my Schaefer GEM by installing a Losmandy Digital Drive. Schaefer mounts cane with synchronous motors only. No slewing speeds, just sidereal speed. Now I have 3 guide speeds and 3 slew speeds. I also added a dec gear replacing the original tangent arm. The mount now has a dovetail clamp to attach the ota. Here are some shots of the new mount.
March 25, 2011 1:52 PM
March 25, 2011 1:53 PM
March 25, 2011 2:58 PM
Are you all ready to go? Anything else to get done before you can get it out under some night skies?
March 25, 2011 9:09 PM
I have observed a couple time with the new drive, works great. This my astro photo set up so now I need to set up the autoguider.
March 26, 2011 6:22 AM
Thanks for that..,
Its great knowing that there are those of us still around that can take an instrument like this and update and restore it to new capabilities..,
look so awesome!
Presumably you're aiming for a portable set up?
March 26, 2011 7:41 AM
That's a nice looking upgrade. What is the PE error?
Take a look at my site!:
March 26, 2011 1:49 PM
Great looking mount Lynn! I have a refurbished AT-9 and have often thought about doing this. For now I have a power inverter for remote operation. Of course that is no answer for fast slewing, a capability I would love to have.
How about a few more details? What size mount is yours, the -7? How do you determine what size motors are required?
Jeff Morgan - Wile E. Coyote School of Telescope Making
March 26, 2011 4:40 PM
Jeff and all,
This is a 6" Schaefer, one of the smallest, and yes it is a portable rig. Bill Schaefer used Byers gears which have a reputation for low PE. A friend uses a 9" Schaefer to carry his 12" astrograph, guided with an ST-4, and it works just fine without even PEC correction. He designed and built his own stepper drives for his mount.
This a stock G-11 Digital Drive 492, these come up for sale on Astromart as G-11 and G-8 owners upgrade to Gemini Goto drives. The G-8 has a 8 min. worm cycle, the G-11 is 4 min. My mount has an 8 min. cycle (180 teeth worm wheel) so the G-11 (4 min.) drive required a 2 to 1 reduction to get the needed 8 min. cycle. I added a dec. gear to make the mount more compact, got rid of the large saddle plate and replaced with a dovetail clamp. But this mod could be done using the original saddle and tangent arm drive. My dec gear was salvaged from an old Meade SCT fork drive, that also has a 180 tooth worm wheel. I suppose a Gemini Goto could be added to my mount. BTW when G-8/G-11 owners upgrade to Gemini Goto they have to replace everything, drive box, handcontoller, motors, cables, everything, so you pickup a complete system this way, cool. Lynn
March 26, 2011 5:05 PM
Saving an old Cave Newtonian was one of my most satisfying ATM project I have completed. It was literally melting in the owners backyard! Now it is in regular use for visible solar system observing. The mount had to be beaten apart during the restore, but now it is a fine telescope. Like I said, satisfying. Lynn
/ Updated Schaefer Mount
Back To Top
Like This Topic
Blue & Grey
Remove This Ad
CNers have asked about a donation box for Cloudy Nights over the years, so here you go. Donation is not required by any means, so please enjoy your stay.
I don't want no stinking ads, but I want to help Cloudy Nights!!!!