Quote Originally Posted by Tenson View Post
I don't understand why the same simple bearing can't be used on each end.
The ballscrew is going to push axially (lengthwise). It needs something to push against so one bearing must be fixed axially.

If you fix both ends axially you have to wonder what will happen when it expands and contracts due to temperature change.

Fixing at both ends is good if you can hold it in tension with springs, otherwise you have to let one end free to slide.