Quote Originally Posted by John S View Post
The only type of drive that can handle miss-alignment in two axis is the Oldham coupling
Looking at the specs Oldham couplings tolerate a surprisingly small amount of misalignment, not that that's a reason not to use them since you're doing something wrong if you can't get the shafts close enough...

Timing belts / pulleys are clearly the best solution for driving ballscrews... numerous reasons, but that's not really relevant here.

Hank, if you'd like me to make the part and can send me the drawing by tomorrow morning I should be able to fit it in. I've got plenty of aluminium bar, lots of sizes up to 3.5".