Re: [CAD_CAM_EDM_DRO] Re: rolled ball screws

The HIWIN ballscrews I mentioned are rolled and supplied
from the factory with oversize ball preload at about 5%
max dynamic load. I did not put them in. The drag torque
is about 100 in oz.

As far as I know they are the only manufacturer offering
this type of preload on a rolled screw. All the others had
to use a soft spring to preload double nuts, and the stiffness
was much too low for my application. Of course most
have stiff preload ground screws, but they are very costly.

I did visit the HIWIN US headquarters and saw them putting
in balls for special order preload amounts. A guy there had
a bunch of balls sorted into small bins for size in one micron
increments. He put them in with tweezers. I wouldn't want
to try it.

Les

Leslie Watts
L M Watts Furniture
Tiger, Georgia USA
http://www.alltel.net/~leswatts/wattsfurniturewp.html
engineering page:
http://www.alltel.net/~leswatts/shop.html
Surplus cnc for sale:
http://www.alltel.net/~leswatts/forsale.html

> Hi, where where you getting the oversized balls from?
> did you have a asortment of balls available for testing
> what size did you end up using?
> Did you replace all the balls per nut?
>
> I like to do this so thanks in advance for anybody that can
> contribute some info here.