Siemens Sinumerik 840D sl Programming Manual page 216

Motion commands
10.10 Thread cutting
Note
With continuous-path mode G64, the blocks are linked by the look-ahead velocity control in
such a way that there are no velocity jumps.
Direction of rotation of the thread
The direction of rotation of the thread is determined by the direction of rotation of the spindle:
● Clockwise with M3 produces a right-hand thread
● Counter-clockwise with M4 produces a left-hand thread
Syntax
Cylinder thread:
G33 Z... K...
G33 Z... K... SF=...
Face thread:
G33 X... I...
G33 X... I... SF=...
Tapered thread:
G33 X... Z... K...
G33 X... Z... K... SF=...
G33 X... Z... I...
G33 X... Z... I... SF=...
Meaning
G33:
X... Y... Z... :
I... :
J... :
K... :
Z:
X:
Z... K... :
X... I... :
I... or K... :
216
Command for thread cutting with constant lead
End point(s) in Cartesian coordinates
Thread lead in X direction
Thread lead in Y direction
Thread lead in Z direction
Longitudinal axis
Transverse axis
Thread length and lead for cylinder threads
Thread diameter and thread lead for face threads
Thread lead for tapered threads
The specification (I... or K...) refers to the taper angle:
< 45°: The thread lead is specified with K... (thread lead in longitu‐
dinal direction).
> 45°: The thread lead is specified with I.. (thread lead in transverse
direction).
= 45°: The thread lead can be specified with I... or K....
Programming Manual, 01/2015, 6FC5398-1BP40-5BA2
Fundamentals