Help Metric LH thread

[Highpower]

(09-13-2015, 02:24 AM)lilyies Wrote: Gday everyone
I am cutting a LH metric lead screw and want to confirm what angle to set my compond slide.
Do I set it to the left or right also for the internal thread on the nut is the compound slide
set to the left or right. thanks Tony

I set my compound in the same way used for an external RH thread. (Swung to the right.) The difference for an internal LH thread is that you would feed OUT on the compound instead of IN, to make your cuts on the leading edge of your threading tool. Carriage moving left to right of course...