[ATM] Aluminium or stainless steel?

["Gary McKenzie" <garymck@netspace.net.au>]

Hi,

As part of a mount I am making I need to determine whether to use (from
materials already at hand) a 50mm stainless steel shaft, or a piece of
aluminium tube 85mm in diameter with walls either 5mm or 10mm thick.

I need to be able to support a load of around 15kg at a distance of 500mm
from the nearest bearing. One end is supported and the other end is free. 

I'm building something like a torque tube mount, and this will form the RA
axis.

Will either of these options provide sufficient resistence to flexure, or do
I need to go bigger?

Since I'm not an engineer I need a bit of advice here....

Cheers
Gary

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