Cad,
Yes, I manually coded this as I do with all my projects. Since I'm not milling any compound curves, this has been a non-issue. The tool holder I used was a 1/2" shank lathe tool clamped in my vise. I don't remember the insert model and I'm not in my shop now, but it's almost square and slopes downward (negative?), This a.m. I ran some QC tests to see if a 1/4" solid carbide could thread mill at S4000 F30. For anybody who might have been wondering bout that, it failed. Two seconds/inch didn't seem that fast, but I guess combined with the helical motion, it was a little overly aggressive. As soon as I can replace the threadmill, I'll try again at F10 and three passes down to the minor dia. instead of foolishly trying to do it in a single pass. I do have a 1/2x20 LH die I could use, but I have a lot of these pieces to make, so thread milling seems the way to go. This was my first attempt, I mean QC test