I think it is clearing up!
Retired owner of Tectron Telescopes and retired editor of "Amateur Astronomy Magazine." Author of "The Modern Dobsonian" and "Starry Starry Nights"
7x35 and 10x50 sears tower binocs, 3" f/10 edmunds reflector, 2.4" f/11.7 manon refractor, 6" f/8 jaegers refractor, 10" f/11 R30 Istar refractor, 3" f/15.8 sans&streiffe refractor, 3.1" f/15 selsi refractor(towa 339), 2.4" f/15 sears refractor, selsi 30x30mm spyglass, criterion 5-draw 25x45x75x spyglass(1957), 4.25" f/14.8 tasco 20te.http://cleardarksky.com/c/OmahaNEkey.html
12.5 " F5.6 Homemade Dob , mirror ground and figured by myself 10 " F4.0 LXD55 Meade 6" F8 Homemade Dob , mirror ground and figured by myself , Sears 60mm x 900mm Refractor
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m1OASYS automation system
CG5ASGT Astro-Tech AT6RC Zhumell 10 inch dob deluxe kit 10x12 observatory Echo Astronomy maker of Custom bahtinov masks and Duncan collimation masks.
I lost count of my scopes. Now I just want mobility. I came, I saw, I bought some interesting accessories, and put names to faces: NEAF 2012, ASAE 2012, SWAP 2013, ASAE 2013.
Quote:Tom, the picture you posted is an Ash Dome shutter motor set up, They use the same sort of track for the rotation but it's horizontal not vertical so couldn't be bent easily on site to fit your radius. If you mounted it vertically so you could bend it, you'd have to do some sort of "capture" to keep the gear in the rack. You might check with them or Dan at Exploradome. They put a pretty good system together. It's similar and I'd bet it'd be cheaper.
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AP 130EDF-GT & AP Mach1
C14-XLT & AP 900GTO
Quote:I'll confirm that the pic is of the shutter drive system of an Ash dome.
Quote:Just in food for thought, a drive chain can be laid out so it acts like a rack. This would be the inverse of your picture, with the chain underneath with guides to keep it from moving side to side and the sprocket on top (outside of the shutter). I would suggest supporting the shutter with roller-blade wheels. But a rack made this way wouldn't need to be the perfect curvature- a support roller would make sure the local separation was correct, or the chain could be picked up on each side by small guide sprockets. -Rich