John:
Let us know how your testing goes, I know your test lathe has a low torque issue, and the resuilts of hard steel vs AL will be interesting and show me how well correction is maintaining its
accuracy. The number crunching seems to show we shoudlo be able to expect a good thread even if the spindle slows to less than 25% of the start speed. ( Though how much effect on
the pitch from pitch to pitch woudl be interesting to see.
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Art