I have a set of Rockford .750 x .200 double nut ajustable preload ball screws.


These are new, but when I go to preload them they get rough. There very smooth all the way upto zero backlash but once I start adding preload they get a roughness to them. Oil doesnt help or hurt them.

I took the nuts apart and cleaned and inspected them to find nothing looking wrong. The balls though only measure .1237 which I thought odd.

DOes this sound like the balls might just be to small ?

You can watch down in the threads and when the setup gets rough you can see the balls try to stack when they go to the return tube.


Jess