Re: Making your own Ball nuts

Jon,

"Nook" brand ball screw tolerance is about +/- .005 per foot. I
allow for any variance with the CNC control settings and CNC
program. Good enough for my CNC hobby mill.

Wayne

> Read more closely, and look at the pictures. He isn't making ball

nuts, he

> is assembling 2 Thompson single-row ball nuts on one screw, with a
> preloading device, to eliminate backlash. By the way, those black

screws

> are power transmission screws, not precision screws for positioning

systems.

> Accuracy is +/- ???. They really don't spec them, which means they

can

> vary all over the place, even on the same screw. So, preloading

schemes

> may not work real well on such a screw.
>
> Jon