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ProfMMC
sage
Reged: 09/13/07
Posts: 298
Loc: London UK
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I am going to mount my EQ6 on a pier and need to get a friend of my dads to weld up a top plate. As far as I can tell the boss just sits inside a void, and two threaded bolts either side of the boss move the mount around to get exact north.
Therefore a rectangular boss of the same size should do just as well on my top plate.
Am I right, or have I missed something?
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Orion Optics UK 350mm F4.7 Dob (dismantled)
Celestron 8SE f10, Meade 5000ED 127mm, ETX125 OTA f15
Revelation ED 80mm f6.8, Meade 5000ED 80mm f6
WO ZS66mm f5.9, WO ZS70mm f6
EQ6 Pro, CG5-GT, WO Eazy Touch
DSI I + II QHY6 Pro, Shoestring GPUSB EQMOD
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russ_watters
Pooh-Bah
Reged: 11/24/04
Posts: 1293
Loc: Trappe, PA
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I think it is trapezoidal because the inside-front of the mount head is sloped.
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Equipment: Orion Atlas 11, ED80, DSI-C, DSI II Pro, Dell Inspiron Laptop.
www.russsscope.net
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cocobolo
Carpal Tunnel
Reged: 10/27/07
Posts: 1550
Loc: british columbia, canada
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Aw, heck, they probably made it that shape just so they could charge you more money.
You shouldn't have any trouble with a rectangular boss. I made one using an allen head bolt, which of course was round. Works just fine. Once the alignment bolts touch the side of the boss, I don't suppose they much care what shape the boss is!! Keith
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Olivier Biot
Amused
Reged: 04/25/05
Posts: 17325
Loc: 51°N (Belgium)
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I'd also go with a cylindrical head allen head bolt.
Cheers!
Olivier
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Computer entomology: study of computer bugs
Tal-200K (#199) with JMI NGF-Mini2M focuser on GEM3 • Astro-Tech AT80ED • Orion Sirius EQ-G with wireless EQDIRECT • Astro-Tech Voyager • Celestron Regal LX 10x42 • Helios 15x70
ATM 14" f/5 (redesigning) • ATM 10" f/6 Portable Truss (polishing) • ATM 10" f/25 Dall-Kirkham (optics)
AstroForecast
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dsnope
Pooh-Bah
Reged: 04/28/06
Posts: 1019
Loc: OC California
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I took a few pictures of mine to illustrate the beveled edge on the azm block.
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dsnope
Pooh-Bah
Reged: 04/28/06
Posts: 1019
Loc: OC California
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underside of mount
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