Siemens SINUMERIK 840D sl Programming Manual page 226

Fundamentals
2.9 Motion commands
The cylinder thread is described by:
● Thread length
● Thread lead
The thread length is entered with one of the Cartesian coordinates X, Y or Z in absolute or
incremental dimensions (for turning machines preferably in the Z direction). Allowance must
also be made for the run-in and run-out paths, across which the feed is accelerated or
decelerated.
The thread lead is entered at addresses I, J, K (K is preferable for turning machines).
Face thread
The face thread is described by:
● Thread diameter (preferably in the X direction)
● Thread lead (preferably with I)
226
Programming Manual, 12/2019, 6FC5398-2EP40-0BA0
NC programming