[Andy Baker]

Clark,

You are right on the money, this extruded t-slot extrusion stuff is strong and rigid.

It's called "deflection in a beam", and it's a factor of a beam's material (modulus of elasticity), geometry (the moment of inertia and section modulus), and load at a given point.

The manuals of these companies always have a good chart which shows the deflection for eact extrusion profile.

All in all... it's very strong stuff and easy to use. The toughest thing is simply getting use to the hardware (fasteners and brackets) that are used with the t-slot style of attaching to the stuff.

Andy B.

edit... by the way, that "magnet bot" which lofted the balls into the goals was built with a "small kit" of IPS extrusions... I think.