HEIDENHAIN MANUALPLUS 620 User Manual page 275

Cycle run
1 Calculates the number of cutting passes.
2 Returns diagonally to the internal starting point at rapid
traverse. This point lies in front of the "starting point of thread"
by the run-in length B. With H=1 (or 2, 3) the current offset is
taken into account for calculating the internal starting point.
The internal starting point is calculated on the basis of the tool
tip.
3 Accelerates to feed rate (line B).
4 Executes a thread cut.
5 Decelerates (line P).
6 Retracts to safety clearance, returns at rapid traverse, and
approaches for next pass. For multiple threads, the same rate
of cut is used for each thread turn, before the next infeed
motion is executed.
7 Repeats 3 to 6 until the complete thread has been cut.
8 Executes air cuts.
9 Returns to starting point.
HEIDENHAIN MANUALplus 620 275