This just for my curiosity, I'm not about to go CNC.

I assume that the lead screw is controlled independently of the spindle,
with its own motor, not through a spindle-linked gearbox. Or, is it
linked & the gear selection computer controlled?

If a separate motor, there is a huge range of speeds required: feed from
..0025 to .250 is 100:1 & that's multiplied by the spindle speed range,
say 200 to 2000 is 10:1. 1000:1 total. How do they do that?

If not a separate motor ... never mind.

Thanks,
Bob
--
Nota for President