Ok, that was in fact the problem with the 'Z' rumbling. I had to make muliple adjustments, but it's nice and smooth now.
Of course, now my 'X' is making the same noise when it's heading to the right side. I don't see any real adjustments here. Any ideas on this one?
If I hit this problem in the 'Y' is there something to adjust there as well?
Too bad Taig doesn't send a nice little manual with their machines and a troubleshooting guide.
Thanks
-Ed