Here is a pic with the X axis motor removed and the locknut removed, showing the outer bearing:
In order to read the part numbers of the thrust bearings, I had to take them out. Here is a pic of the outer set (there is a duplicate set on the inside, though I didn't take those out I assume they are the same part#).
The part # for the thrust bearing is NACHI JAPAN 205. One of the pieces also has handwritten "205ps" and "SSB973"
The thrust bearing raceways measure 25mm ID by 47mm OD by 4.18mm thick. The center bearing retainer piece measures 26.26mm ID by 45.42mm OD with a ball bearing diameter of 7.93mm.
I liberally greased everything and reassembled. I tried tightning the locknut thinking I could take out some of the play in the thrust bearing but no matter how tight I got the nut, it didn't seem to affect the play. This makes me think the play is in the *normal* NSK bearings and not the actual thrust bearings? The balls in the thrust bearing I removed looked good, and the 4 that I measured were within 0.0001" of each other. Upon reassembly, I still get the same
0.0015" backlash in the x axis, but perhaps the once per rev thud sound and vibration is a bit reduced.Opinions on what to do next?
Thanks for all the help so far!
Rick