Quote:
Originally Posted by MichaelBick
We try to avoid 6063 aluminum as it is weaker than 6061 and much more finicky to machine. If you are just drilling holes it is probably ok, but if you are doing any end milling avoid it.
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+1. 6063 has a much lower tensile strength and stiffness than 6061. If you take a hard hit to the side, 6063 bends much easier. It's cheaper, but it's not worth it; just move to 2x1.
9 teeth engagement is fine, however, I can't comment on the worth of 18t belts. It may or may not be ok; I would look up the specs of the belts online.
EDIT: Inside the tube? Not just the frame? If you are dead set on something like this, have you considered thick c-channel? That allows for upkeep and should cut down on space usage.
DOUBLEEDIT: Disregard my post about aluminum strength and see people comments below.