OK a few in process shots.....I also made a new nut, a "P" shaped affair....not much photo evidence on that, but I was in "bull in the woods" mode ...12 hour day yesterday
Anyway...a few more shots that seem pretty self explanatory.
To cut the thread, I left the cross slide locked and just moved the compound to add feed. That allowed the follower rest to stay in position. I also left the half nuts closed, and just used the VFD to crawl into position. I had thread reliefs on each end, so that simplified everything.
If I had to do this again, I'd make a cross slide mounted follower that had HSS lathe blanks to bear against the part. The bronze just wore too fast. I ended up dressing the surfaces on the mill 3 times to make that screw....and as it wore, the screw would push away.. It was tedious.
Always take a scratch cut...and Always check it with a thread gage.....ALWAYS!
Dave