Quote Originally Posted by i2i View Post
Not really, you're adjusting the preload on the pair of angular contact bearings in the green block that fixes the ball screw to the table.
...the blue ones in the illustration below. I was trying to figure that out.

Click image for larger version. 

Name:	BallscrewBearings.jpg 
Views:	995 
Size:	60.4 KB 
ID:	16724