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For small lathes, and larger threads, the above technique doesn't work very
well. For example, on my Sherline lathe, if my Z axis moves at 20 IPM, and
I'm trying to do a 3/8-16 thread, then I have to reduce the RPM down to 320
or below. With a pulley drive, this would be fine, but with the variable
speed motor, you loose torque going that slow, so using the technique above
tends to stall as the cuts get wider (even though its removing less material).
Having it nibble away smaller fixed amounts each time (like this picture
shows), seems more appropriate.
Bigger...
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