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Converting a Logan 11" x 32" Lathe over to full CNC, Part 6:



The bearing block was (more or less) mounted, but I didn't want to mount it directly to the end of the slide.
I wanted the slide to travel slightly past (rearward) the end of the dovetail, to help maximize the overall slide travel.



For that, I made a quick-and-dirty spacer from 1" bar stock. I still need to clearance the dovetail.



Clearanced and bolted to the stack. Since I drilled the bolt holes slightly oversize, the bearings were able to float
slightly to find the center, so everything's fairly well aligned.



Now, this particular ballscrew didn't come with a locking nut, and even when they do, they use a tiny setscrew to
lock to the threads, which usually damages them. I decided to make my own, and so got out a bit of 1" hot-rolled
out of the scrap bin, and drilled and tapped it to 10mm 1.0.



After that, I drilled and tapped it for a 6-32 pinch bolt...



And parted it off at about 1/4" thickness.



The parted side got faced, and then I slit it with a saw.



And done. A clamping, non-thread-marring locknut.



Which installs like so. I was going to add some wrench flats, but it tightens easily by hand.



Now, to keep the reduction belt pulley from sticking out too far, I thinned it up quite a bit,
and counterbored the backside to clear the new nut.



Last, I ground two setscrew flats on the end of the ballscrew shaft, slid the pulley on, and locked 'er in place.





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