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polaraligned
sage
Reged: 12/26/08
Posts: 227
Loc: P. R. of New Jersey
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Quote:
Well, with the double rod, things are indeed better, at the expense of about 1.5oz. (I could get it back if I shifted to a double aluminum rod arrangement, I guess.)
Keep in mind that aluminum has 1/3 the stiffness of steel, for a given cross section. So the steel in the long run is your best bet.
Scott
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Moki
super member
Reged: 11/06/05
Posts: 428
Loc: Under the Clouds
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Great! Glad things worked out for you with a relatively simple solution. I like simple... 
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"In questions of science, the authority of a thousand is not worth the humble reasoning of a single individual." Galileo
12.5" F5.3 Dob on EQ platform
8" F7 planetary Dob / EQ Platform
Current ATM projects:
Xtal-Controlled EQ platform motor drive - finished... It works!
Motorized focus for planetary (moved to the bottom of the list for now)
10" F5.5 Verylight PushTo
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arpruss
scholastic sledgehammer
Reged: 05/23/08
Posts: 848
Loc: Waco, TX
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Thanks everybody. It's really great how I can post a query, and within a couple of hours get half a dozen solutions. I didn't adopt any of the offered solutions in the end, but they got me thinking in the right direction, namely the direction of something with parallelism and spacing, such as I-beams, channels and tubes.
By the way, the scope is now basically finished, though I will improve the light shield eventually, I expect, and I need to mount an RDF.
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Coulter Odyssey 13.1" split-tube
Coulter Odyssey 8"
Home-made 7.8" F/4 dobsonian travel scope
Home-made 68mm F/5.3 achro (typically used as finder on 13.1")
Skymaster 15x70
BPTs4 8x30
32mm Plossl, 30mm Rini, 27mm Kellner, 13mm Hyperion, 6mm TMB/BO Planetary, Owl 2X Barlow
Palm TX with AstroInfo and RescoViewer
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polaraligned
sage
Reged: 12/26/08
Posts: 227
Loc: P. R. of New Jersey
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Quote:
I didn't adopt any of the offered solutions in the end, but they got me thinking in the right direction, namely the direction of something with parallelism and spacing, such as I-beams, channels and tubes.
I did suggest adopting a different cross section such as an I-beam or rectangle. 
Scott
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