I am staring on the x axis on my IH Mill and have been looking at designs for the bearing blocks and have some questions with regard to the bearing block's construction.
I have seen 3 different designs with regard to placement of the AC Bearings in the bearing block (driven side of the ball screw)
1. a shoulder built into the bearing block to separate the back to back AC bearings
2. a spacer/washer placed in between the AC bearings to separate the back to back AC Bearings
3. nothing between the AC bearings

I am curious as to which design is better? Or is it 6 of one half dozen of another?


Thanks,
Devin