NPT Internal Threads

[Wongster]

Wow!!! Thanks guys!!!

I should call it NPS. That guy just told me NPT but ignore the taper... lol. I'm clueless.

Anyway, I do have a tiny cnc lathe. Not full cnc, only 2 axis, unlike those machining center I watched on YouTube. It's a Sherline lathe with long bed. It's currently beneath the workbench to make space in the otherwise super crowded "shop".

Cutting in reverse direction is a good idea. And about threading dial, is it something I can just add on to my kind of lathe? It's a Proxxon PD400 with a 12mm x 1.5mm leadscrew. With a threading dial, can I disengage the leadscrew when I reached the end of a cut? I feel safer that way; to use the lever to engage and disengage the saddle from the leadscrew. Too nervous to do this job.