Siemens SINUMERIK 840Di sl Programming Manual page 165

Right-hand/left-hand threads
Right-hand or left-hand threads are set according to the spindle direction:
M3: Clockwise
M4: CCW rotation
Programming
Cylinder thread
G33 Z... K ... SF=...
Face thread
G33 X... I... SF=...
Taper thread
G33 X... Z... K... SF=...
Or
G33 X... Z... I... SF=...
Parameters
G33
X Y Z
I
J
K
Z
X
Z... K...
X... I...
I... K...
K (taper thread)
Fundamentals
Programming Manual, 11/2006, 6FC5398-1BP10-2BA0
4.15 Thread cutting with constant lead (G33)
Thread cutting with constant speed
End point in Cartesian coordinates
Thread lead in X direction
Thread lead in Y direction
Thread lead in Z direction
Longitudinal axis
Transverse axis
The thread length and thread lead for cylinder threads
Thread diameter and thread lead for face threads
The dominant direction share for tape thread in X or Z
Lead angle <45°, thread lead in longitudinal direction
Motion commands
165