Hey Folks,

So, I managed to bugger up my X axis ball screw and am searching for a replacement. In the meantime, I've ordered some 10x30x14.3 double row angular contact bearings and some spherical roller bearings of the same OD/ID. Now, I'd like to redo my X and Y axis to eliminate the 3-4 thou of backlash I was seeing when the table was loaded up. So, that begs the question: What's the preferred stack of bearings for constraining my X axis? I've seen a lot of variations, and my old one used the stock bearings one on either side of the end plates. I'm thinking I put a thrust washer on the outsides of the plates, under the locknuts, and put the double row bearings on the inside as only axial support.

How have you done it? Have you had any problems? Is there a best practice? How do you deal with thermal expansion of the ballscrew?