Aluminium tubing for telescopic support

**irving2008** · 06-09-2013

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

**phill05** · 06-09-2013

what about 25.5mm dia with a 3.175 thick wall, what length & qty are you wanting.

Phill

**irving2008** · 06-09-2013

Originally Posted by phill05

what about 25.5mm dia with a 3.175 thick wall, what length & qty are you wanting.

Phill

Thanks, but not strong enough and I need two tubes... The need is to provide a height adjustable support for a ~15kg load with a deflection less than 4mm when the support is at a 15degree angle.

**phill05** · 07-09-2013

What if you had a steel rod of say 19mm dia as the sliding part down the bore?

**irving2008** · 07-09-2013

Originally Posted by phill05

What if you had a steel rod of say 19mm dia as the sliding part down the bore?

That might work. A quick mental calc says about 4mm deflection at 1m with 600mm of rod in a 600mm tube (ie min height would be 600mm). I need to do more accurate bending calcs and torsional calcs as may allow too much rotation Weight is about 2.9kg. Only downside is a 1" pole looks aesthetically 'flimsy' lol