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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Nesta página do site você pode assistir ao vídeo on-line Threadmilling on a manual lathe duração hora minuto segundo em boa qualidade , que foi baixado pelo usuário Stefan Gotteswinter 26 Julho 2020, compartilhe o link com seus amigos e conhecidos, no youtube este vídeo já foi visto 140,428 vezes e gostou 3.9 mil espectadores. Boa visualização!