X0.72 (rapid move to the diameter of the first pass) G0 X1.0 Z0.2 (position the tool to clear the thread’s major diameter and three to four times its pitch in front of the part face) For example, the following is a possible program for a 3/4"-16 × 1"-long thread on the OD of a shaft: You simply programmed where you wanted the tool to go and the machine control took care of the rest. No more fooling with clumsy gearboxes or levers. ![]() Bicentennial celebration, tape-operated lathes made all of this headache obsolete. Fast reflexes were needed to engage an engine lathe’s lead-screw dial at precisely the right time and disengage it before crashing into the shoulder. ![]() Before CNC lathes, single-point threading was a pain in the neck.
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