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Converting a Logan 11" x 32" Lathe over to full CNC, Part 7:
In contrast to the 12mm ballscrews, the 20mm screw for the Z axis came with premade end supports with
bearings and seals. I'm not thrilled that the locknut uses a grub screw, which tends to damage the threads,
so I'll shortly be replacing that with another clamping nut.
I was rather limited in choices for mounting the screw, as I was trying not to have to make any permanent
changes to any of the main castings. Also, due to the size of the reduction belt pulley, I had to have the end
of the shaft located past the body of the bed. Fortunately, there was a small drilled & tapped mounting
pad already machined into the casting, used for mounting the original leadscrew.
After a bit of thought, I whipped up a fairly simple plate out of 1/2" aluminum flatbar.
I'd originally thought I could overlap the bearing block with the bolt holes, and so used
countersunk screws, but the spacing just wouldn't work.
Pretty simple and straightforward. It's about the closest I could get the ballscrew to the carriage.
A similar, but longer mount holds the tailstock end of the screw. In this case, the existing mounting pad
was for the right-hand-end support for the leadscrew. So far, no new holes drilled.
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