Programmed Run-In And Run-Out Path For G33, G34 And G35 (Dits, Dite) - Siemens SINUMERIK 840D sl Programming Manual

Fundamentals
2.9 Motion commands
Taper thread with increasing pitch:
G34 X... Z... K... F...
G34 X... Z... I... F...
Taper thread with decreasing pitch:
G35 X... Z... K... F...
G35 X... Z... I... F...
Meaning
G34:
G35:
X... Y... Z... :
I... :
J... :
K... :
F... :
Example
Program code
N1608 M3 S10
N1609 G0 G64 Z40 X216
N1610 G33 Z0 K100 SF=R14
N1611 G35 Z-200 K100 F17.045455
N1612 G33 Z-240 K50
N1613 G0 X218
N1614 G0 Z40
N1615 M17
2.9.10.3

Programmed run-in and run-out path for G33, G34 and G35 (DITS, DITE)

The run-in and run-out path of the thread can be specified in the part program with the DITS
and DITE addresses.
228
Command for thread cutting with linear increasing pitch
Command for thread cutting with linear decreasing pitch
End point(s) in Cartesian coordinates
Thread pitch in X direction
Thread pitch in Y direction
Thread pitch in Z direction
Thread pitch change
If you already know the starting and final pitch of a thread, you can calculate
the thread pitch change to be programmed using the following equation:
The meanings are as follows:
k : Final pitch thread (thread pitch of axis target point coordinate) [mm/
e
rev]
k : Starting thread pitch (programmed under I, J or K) [mm/rev]
a
I : Thread length [mm]
G
Comment
; Spindle on.
; Approach starting point.
; Thread cutting with constant pitch
(100 mm/rev).
; Pitch decrease: 17.0454 mm/rev2
Pitch at end of block: 50 mm/rev
; Traverse thread block without jerk.
Programming Manual, 12/2019, 6FC5398-2EP40-0BA0
NC programming