I was assuming that the 608's would take care of movements in "Spin" and "axis" directions?

There would be Nuts and Washers ether side of the 608's holding the rod in place ? would that not stop the movement in both directions? understanding the 608's would be pushing against the machine as everthing is in use?

I'm still very new myself, so i appreciate i could learn somthing here. I just cant see that the thrust bearings will do anything more then the 608's would be doing?

So i'v just had another look at your pic Nick, so we would have 608's supporting each end of the threaded rod, then we would have our anti-backlash nut inplace next to our "lead screw" and this would consist of our 608 with a "thrust bearings" also behind that.

Again i cant understand how the "thrust bearings" will do anything more to help, i wait your replys guys.

CNCUK