Amount of coupler purchase required on 1/2'' hex?

[ToddF]

Originally Posted by Oblarg

Thanks.

The reason I ask is I'm playing around with some drive train designs and am wondering how feasible it would be to couple an output shaft from a gearbox and the center-wheel shaft of a 6WD inside a piece of 2''x1'' tubing. 1'' isn't all that much space to work with to start, and once you account for the bearing you're left with ~3/8'' of engagement on each shaft. I could use 2''x1.5'', if all else fails, but that's significantly heavier and takes up more space.

Very interesting. I'm assuming this is a drive train with the wheel axle supported by bearings on both ends, not a WCD style drive train, where the center wheel axle IS the gearbox output shaft. Correct? Got a sketch?