Threadmilling on a manual lathe
I had work recently that required some ID threads with basicaly no leadout. I did them with a regular tap, followed by a bottoming tap that had all its lead ground away. As the material was 316 stainless, it was a rather painfull experience ;-)
Threadmilling could be a very good solution, as it is almost completely independent from the rotational speed of the workpiece.
Here is what I tried, with a heavy duty routermotor mounted to my lathe.
Also: Shopground threadmills, deburring and coldblue-application.
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