Got a wood working project but need some metalwork parts

[JimA]

Hello,
I was wondering if any of you can help me please. I'm building a Dobsonian telescope and I've got the wooden design sorted out, but I'm struggling to find some fixtures to tie it together. If anyone can suggest anything I'd be really grateful.

I need two parts
i.) I've two flat pieces of wood 0.5x0.5m in size and I could really do with a fixture so that one can rotate in a stable manner wrt the other piece, a bit like a square lazy suzanne.

ii.) I've a 20mm thick piece of wood (ash) but I need to force another piece of wood away from it at right angles. I was planning on having something like a hollow screw with a screw thread on the outside to fix it into the 20mm piece of wood, and a inside thread holding a long threaded piece of metal screw thread. On the other end I need something that can fix onto the threaded bar, but freely rotate so it can be fixed into the other piece of wood. I could then put a knob on the other side which could be used to force the two pieces of wood apart.

Really any suggestions would be gratefully received, I've searched everywhere in Sheffield.
James

 

[AndyT]

It's a bit hard to visualise but for your two big squares of wood where you want something like a lazy Susan could you just buy a lazy Susan mechanism? Axminster sell them up to 300mm diameter:
http://www.axminster.co.uk/triangle-lazy-susan-bearing-prod20991/?searchfor=lazy susan

For the other requirement it might be too bulky or too awkward but could you do something based on a bench screw?

http://www.axminster.co.uk/york-york-universal-vice-screw-prod22376/

 

[flh801978]

Anything you need making I can make for you

Ian

 

[kostello]

For your lazy Susan could you use a wheel hub

.

 

[Myfordman]

Rout a circular groove in each piece with a round nosed cutter about 2/3rd of the nose radius deep. Fill the ring with ball bearings with diameter 2 x radius of the cutter.