Jeff Morgan - Wile E. Coyote School of Telescope Making
Celestron 8SE Dobstuff 13.1": Swayze refigured Coulter mirror, 6 pt mirror cell (2 pt edge support) and CF focuser board made by me StarBlast 4.5 ST80/PortaMount II Zhumell 20x80/Oberwerk 15x70 on a Seronik-style tripod boom mount Hubble Optics 18 inch F/4 mirror.
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Quote:Isn't it nice to have the alt center of rotation fall on the mirror box side for easy, solid mounting of an encoder?
Quote:It seems to be a common choice to put the alt rotation point at or just below the top edge of the mirror box.
Christopher AstroSky 16 inch dob 12.5 inch build for my dad. http://s1232.photobucket.com/u...%20inch%20truss%20II
DIY Astro Chair http://s1232.photobucket.com/u.../diy%20astro%20chair
Quote:Thanks for the replies. I don't know if I would call what I am building "compact", but the mirror box will only be 4" high. I am working to keep weight down, above and below CG. So far I don't see any compelling for a big mirror box. Encoders, no problem. Flex in truss tubes, not going to be an issue. Bearings too big? well maybe, but I am making them removeable.
A 60mm department store refractor started it all....
Quote:...So the taller boxes add weight below the COG and make it easier to add things to the upper assembly. And it would seem to be easier to add encoders....
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Quote:As mirror makers keep bucking the norm and going faster and faster, the large mirror box becomes unnecessary (and too heavy).
20 inch f8 Chief Ed Jones designed and a 17 f9 Zanbuto Wide Band Chief Mike Jones designed .Both unobstructed telescopes .
Home made 16" f5 Terry Ostahowski optics - ArgoNavis/ServoCAT
ES 30 mm, Ethos 21, 13 and 10 mm, Paracorr II, Antares Barlow 2" 1.6X
2" DGM NPB filter
2" Catseye Cheshire/Sight tube - 2" Howie Glatter laser + Tublug
Quote:Jeff - what do you mean by force multiplier?
Quote:Jeff, is this your second double truss scope?http://www.cloudynights.com/item.php?item_id=2571I would be interested in hearing more about this build, could you post a write up on this forum about it so that we can learn from your experience? It incorporates a number of unusual or innovative features (the double truss itself, construction materials).I would have thought that the lengthy set-up time would be due to the double truss instead of the ServoCAT.
Quote:For me, a compact mirror box design for a telescope from 16 ", it has more advantages over the K-B classic mirror box, especially less primary box weight and acclimatization. My mirror box.
Quote:Hi Victor, I was wondering about the movement, if any, orthogonal to the plane of the alt bearing. Like in the pic below. Does this causing any error in the encoder?