Jeshua Lacock wrote: > > It looks like over a 10 foot span I have about 24mm (0.96 inches) of sag in > the middle. > 10 foot span? 25 mm diameter? Oh, my, that sounds WAY past the safe range. See http://www.nookindustries.com/ball/BallCalculators.cfm#CriticalSpeed for a critical speed calculator. With the stiffest fixing of the ends, you might be able to get 500 RPM safely. That would be 100 IPM with a 5 TPI screw. With a coarser leadscrew pitch, you don't ned as high an RPM, so maybe this will be OK.
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