So the last problem I had was that the bearing block was over bored and the bearing at the top of the screw on the Z-Drive was hitting the oil fitting for the J-Head.
After looking at it some more tonight with the ball screw nut shells loosely in place I determined I could reduce the length of the screw by ~ 0.5 in. and still be OK on the travel.
So I put it back on the mini lathe and turned it down. I'm getting a lot better. I managed to get it right! 2nd time on that one. I've determined that I need to use a "rule of on half". That is I take off half of what I need to once I get within about .010 of the diameter I am looking for. That's a quarter of the change in diameter I am looking for. Given my flexy bendy mini lathe that allows me some room incase it does something stupid when it hits a hard spot in the metal. It also gets me to the point where I am taking off less and less with each cut thus stressing the lathe less and making for a more accurate cut.
I also got started on the new bearing block. Just got the next chunk of 4 x 1.5 bar stock cut on the band saw. I'm going to make the new block just so I feel better about getting it "right". I could loctite the bearings in there and it would work, but I want to get the boring process wired better. Practice makes perfect. I'll start milling the new block tomorrow night, maybe.
Pics below.
In the first one you can see that it now clears the oil fitting. It will be ~0.25 lower than that when I remake the bearing block.
Second pic is the partial assembly with the nut shells on the screw. No balls in there, just the brush seals holding them up.
Third pick is the bar stock getting cut. Real exciting that one!
But if someone has never seen a metal cutting band saw, it might be interesting.