[VitaminD]

Arizona video is right however there is a fix for this issue.also were are you getting back lash

[dracozny]

with the gibs locked down I get backlash at the pulley even after torquing down all of the bolts. either the slide is flexing or my mount that I made is flexing, possibly a combination thereof. It's a double nut ball screw and I completely replaced the spacer so I know that should not be a factor. after I finish the y motor mount I will look into it further.

[ninefinger]

What do you mean "backlash at the pulley"? Is it rotational backlash ie turns a few degrees before it moves? Have you checked the ballscrew shaft for movement under load (moves up / down when you apply a load)?

[dracozny]

What do you mean "backlash at the pulley"? Is it rotational backlash ie turns a few degrees before it moves? Have you checked the ballscrew shaft for movement under load (moves up / down when you apply a load)?

yea the shaft turns about 3 teeth from one extreme to the other with the gib locked down and about 80lbs of torque applied to the pulley. The ball screw does not move longitudinally my bearing mounts and preload are solid. As mentioned either my ball nut mount is warping or the slide is flexing.