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I look forward to your designs :-) Correct me if I am wrong, but isn't the amount of force it can
hold up a function of friction and area. With a small friction force, due to
smooth aluminum on smooth aluminum, and a small area, due to point contact
between two rounded surfaces, the amount of force that your design can hold up
is significantly less than a threaded system? Also could your design not
greatly benefit from adding another three bearing on the other end of the
bracket and thus doubling the amount of force it can support? Lastly, would you
not be using long and thin bearings or rollers for industrial systems that would be used
to move large loads?