Acording to Nook Industries and their calculator, you can run a 5/8" by 45" long screw with double bearings on each end at 2833 RPM. With a .200" lead that would come out to be 566.6" per minute or 9.443" per second or 45" in 4.765 seconds---WOW--- thats movin. At a .500" lead, that comes out to be 1416.5" per minute, 23.6" per second, 45" in 1.9 seconds---greased lightning.
From those figures I think a 5/8" screw would be ok since running steppers/ ballscrews at those speeds (RPM's) would be impractical.
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