Relationship between Guide rail length and ballscrew length

[Boyan Silyavski]

If i were you, I would definitely design it so that no unnecessary extra ball screw length remains. No need to spin something which is doing nothing.

I agree that the reasonable minimum is 250mm for a strong machine

[Lee Roberts]

If i were you, I would definitely design it so that no unnecessary extra ball screw length remains. No need to spin something which is doing nothing.

I agree that the reasonable minimum is 250mm for a strong machine

Yea exactly, reducing the length will go towards eliminating any "whip" in the screw as well, or was you thinking of a rotating nut design Charlie?

.Me

[CharlieRam]

Cheers guys, No I am not going for a rotating ballnut, this build is going to be hard enough without access to any real machines to make the parts I need! It just got me thinking while I was looking for rails and ballnuts that all the 'sets' I saw have ballscrews as long as or slightly longer than the rails in the kits and I wondered if I was missing something.
Thanks again, the shorter the better for me.