[Liero]

Hi

I'm currently in progress of converting my 45 type mill to cnc.
First axis to be converted is the z-axis. I use 20mm ball screws and therefore FK15 bearing supports which I converted to angular contact bearings.
I only use one fixed bearing support at the top of the collum ==> no lose bearing support at the bottom.
During assembly I noticed that the not supported end of the spindel can be moved by hand in radial direction.

Is this normal? Can this be harmful to my ball screws?

Thanks!

Lukas

[arizonavideo]

That is fine.

If your ball screw nut has slop you will be able to move the screws around. If its tight it will have almost no movement. Having a bearing on that end wont change the backlash or performance if you top rapids are under 200 IPM.