Quote Originally Posted by Shinobiwan View Post
Btw is it essential to have the ballscrew floating end mount on? The bearing is damaged and I figure it isn't really needed for such a short ballscrew since its supported at the fixed end and the ballnut?
Probably not.
The support bearings purpose in life is to support long screws from bending under thier own weight, and/or to stop screws from whipping when spun at speed.
If the screw is short enough/not spun fast enough that whipping is going to be an issue, and it's not long enough/mounted in a way it's own weight could bend it (i.e. hung vertically), then you don't need one.

I'm sure Jonathan will be along shortly with the required calcs for working out the theoretical critical/whipping speed (or just search for his posts, as he's covered it before)