Trying to find aluminium (or steel if I must) in sizes where one bit fits neatly inside another and can be locked in place with simple clamp - think bike seat-tube into frame, but bigger, say outer tube 45 - 60mm dia, 4 or 5mm wall, if ally, 35 - 40mm, 3mm wall if steel.
Ideally, from an aesthetic point of view, i'd prefer oval tubing say 60mm x 30mm OD in ally but this seems like hens teeth...
My google fu isnt delivering today :(
How about the aluminium tube that is used for tall "portable" radio masts? Although I would imagine they might have a thinner wall size than 4-5mm.
Btw, what on earth is "google fu"?
I just came across this afew days ago , i think it's what your after
Buy Telescopic Aluminium Tube online at Metals4u
Edit: On second look they might not be big enough
Here does bigger but not the clamps (just jubilees)
Plain End - Antenna Engineering | Supplier of High Performance Amateur Radio Products
Last edited by Greeny; 06-09-2013 at 04:11 PM.
Thanks both, the antenna mast stuff is on the right lines, but the 1.5mm wall thickness is too thin, even using the 60mm (2.375") size will deflect too much for my purpose, needs 3mm or more :(
'google fu' is the ancient Chinese art of getting the right search term! :D
what about 25.5mm dia with a 3.175 thick wall, what length & qty are you wanting.
Cant find anything of those sizes
All I can suggest is
2.125 + 2.250 + tube of epoxy
2.375 + 2.500 + tube of epoxy
Massive contact area, so would be a very strong bond
What if you had a steel rod of say 19mm dia as the sliding part down the bore?
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