Dave's Router

[Ross77]

I've only rebuilt one so I'm defiantly no expert. I had an old worn ballscrew so thought I'd give it a go. I don't think the balls are anything special except that they should be softer then the ball screw and nut so its the balls themselves that wear out. the ones I got where advertised as suitable for ballscrews so I just had to trust them..........

Reloading the balls isn't to bad . I assembled mine on the screw itself tho. i took off the cover and dropped each one down the same feed tube and then every 2 or 3 pushed them down and around the screw with a small bar. Eventually they appear at the other side of the return tube, that way you know there are no gaps. use plenty of oil. Setting the preload is the difficult bit and will require a box of different sizes to get it right. you might be lucky as yours is new and just be able to fill it with them all the same size.

NSK do a good guide for ball screws, (cant find it at the mo tho.) You will want to check the sizes as I believe some are set up so it is only ever other ball that is the correct size (drive ball) and the intermediate ones used to set the preload. This lowers the drag but also reduces the load capacity.

Like i said mine was basically scrap before I started so didn't have anything to lose. If in doubt wait for Gary....

Good luck