Siemens SINUMERIK 828D Programming Manual page 261

Example 2: Tapered thread with angle less than 45°
Program code
N10 G1 X50 Z0 S500 F100 M3
N20 G33 X110 Z-60 K4
N30 G0 Z0 M30
Fundamentals
Programming Manual, 07/2010, 6FC5398-1BP40-0BA0
9.10 Thread cutting with constant lead (G33)
Comment
; Approach starting point, activate spindle.
; Tapered thread: End point in X and Z,
specification of thread lead with K... in Z
direction (since angle < 45°).
; Retraction, end of program.
Motion commands
261