Quote Originally Posted by Voicecoil View Post
Well, yes I have thanks Bert : however at the moment I'm much better set up for machining aluminium than steel. And part of the reason for the post was to highlight the low torsional performance of normal slotted profiles.
Hi Voicecoil,


I think you did a very good job explaining how the most 8040 t sloted and alike style alu profiles have the less disireable shape for torsion resistance.

And yes round tube is best shape to resist torsion.

I agree the steel/epoxy route is harder to do.

Wish i had someone that could have milled / grind flat my bed / gantry...
Epoxy was a gamble that luckily worked out great for me.

Just buy the biggest heaviest best shaped profile that fits your design / needs / budget.

Rigidity rules.

Grtz Bert.





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