Quote Originally Posted by Jonathan View Post
Easily solved - press a brass/bronze insert into the bearing. I did this for an M12 threaded rod (was going to use it on Z) and machined the insert to fit the thread profile better. I think if you want it to work for a long time then that's the way to go. I'll do it at some point on my Y axis, but for now it's adequate - better than the X-axis nuns.
If say you were using a bronze nut "You Don't Use Brass" that was 12mm long that would have a contact area on the thread of (12x3.142)x12 of 452mm approx, using a bearing this way would have a contact area of approx 20mm that's 22 times less contact area not to mention threaded rod is low grade with a poor surface finish so will wear out the bush in no time.

The fact that this idea is not commercially available says it all really.

Phil