How to pre load screws

[Robin Hewitt]

The problem with backlash is you can get anal about it PDQ. How much is too much? Removing it 100% means springing the nuts and the axial bearings. You can get it down 20 microns with a shimmed double nut, that's better than .001", is that enough?

Hassle is you can still put your thumb against the bed and turn the screw a smidge without feeling it move. If you want to get rid of that it will cost you time more than money.