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Owen
professor emeritus
Reged: 06/21/07
Posts: 514
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Ok, so here is an idea I've been playing with for a truss clamp -
The idea is simple - any plane through a sphere is a circle.
So building on that , all we need to make a 'spherical' joint are some circles (which for the truss ends I have envisaged washers being used, and two holes in a strap clamp and OTA assembly for connection), so this should work well, and be easy to try.
The strap clamp will need a bolt/thumbwheel to tighten, but will of course be adustable for tension - so there will be little chance of set up and collimation shift in use..
So give it a whirl, if you get a little creative with the bolt arrangement, you could even have the bolt captive..
So thats the result of my thought experiment.
Have fun 
Owen
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PrestonE
Pooh-Bah
Reged: 04/29/05
Posts: 1170
Loc: Houston,Texas
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Hi Owen,
If you followed the 20 inch RC build, that is very similar to the idea behind the Invar Ball Ends captured in the circular capture area of the Capture Blocks 
Best Regards,
Preston
--------------------
A few I enjoy,
and a few more in the works ;<)
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Owen
professor emeritus
Reged: 06/21/07
Posts: 514
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Hi Preston,
That was infact the inspiration!
I saw no reason at all to restrain the scale - I think it would do a great job on truss poles - the disks could even be circular wooden disks instead of washers.
The great thing about this technique is that it is
a/ low tech
b/ easy to do
c/ inexpensive (to take costs even lower, the hinge could be wooden  )
I'm seeing discussions about clamped flat truss's, offset drilled blocks, spherical rod ends and the like.I'm just suprised that no one else seems to have thought along these lines.
Have fun
Owen
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Vincent Becker
super member
Reged: 09/16/08
Posts: 198
Loc: France
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This looks very good. I'm giving a lot of thought to my future 16" truss-tube newtonian and this may just be what I was looking for.
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Vincent Becker
10" dobsonian on EQ platform (home-made by my father)
8" string newtonian as travelscope (home-made by myself )
Orion 80ED and GSO 200/1000 on Atlas EQ-G for astro-imaging
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