Siemens SINUMERIK 840Di sl Programming Manual page 167

Example of taper thread with angle less than 45°
Machining a taper thread
N10 G1 X50 Z0 S500 F100 M3
N20 G33 X110 Z-60 K4
N30 G0 Z0 M30
Requirements
Equipment required: speed-controlled spindle with position measurement system.
Operating principle
The control calculates the required feedrate from the programmed spindle speed and the
thread lead. The turning tool traverses across the length of the thread in the longitudinal
and/or facing direction at this feedrate. The feedrate F is not considered for G33, the
limitation to maximum axis speed (rapid traverse) is monitored by the control.
Fundamentals
Programming Manual, 11/2006, 6FC5398-1BP10-2BA0
4.15 Thread cutting with constant lead (G33)
;Approach starting point, activate spindle
;Taper thread: End point on Z and X,
;lead K in Z direction, since angle < 45°
;Retraction, end of program
Motion commands
167