What about thread mills?
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Tap-testing thread mills does a great job of determining the best speed. Because of their low or no helix geometry thread mills are highly prone to chatter if you pick the wrong speed. The axial depth of cut and the radial depth are determined by the application and the thread mill program.
Set the Dashboard to the program's width and depth, then select the best speed for the material. If you get chatter, increase the number of passes to reduce the radial engagement.