Thread Cutting With Increasing Or Decreasing Lead (G34, G35) - Siemens Sinumerik 840D sl Programming Manual

MD10710 $MN_PROG_SD_RESET_SAVE_TAB can be used to specify that the value written
by the part program is written to the corresponding setting data during RESET. The values
are, therefore, retained following power off/on.
Note
DITE acts at the end of the thread as a rounding clearance. This achieves a smooth change
in the axis movement.
When a block with the DITS and/or DITE command is loaded to the interpolator, the path
programmed under DITS is written to SD42010 $SC_THREAD_RAMP_DISP[0] and the path
programmed under DITE is written to SD42010 $SC_THREAD_RAMP_DISP[1].
The current dimensions setting (inch/metric) is applied to the programmed run-in/run-out path.
10.10.3

Thread cutting with increasing or decreasing lead (G34, G35)

With the commands G34 and G35, the G33 functionality has been extended with the option of
programming a change in the thread lead at address F. With G34, this results in a linear
increase and with G35 to a linear decrease of the thread lead. The commands G34 and G35
can therefore be used for the machining of self-tapping threads.
Syntax
Cylinder thread with increasing lead:
G34 Z... K... F...
Cylinder thread with decreasing lead:
G35 Z... K... F...
Face thread with increasing lead:
G34 X... I... F...
Face thread with decreasing lead:
G35 X... I... F...
Taper thread with increasing lead:
G34 X... Z... K... F...
G34 X... Z... I... F...
Taper thread with decreasing lead:
G35 X... Z... K... F...
G35 X... Z... I... F...
Meaning
G34:
G35:
X... Y... Z... :
I... :
J... :
Fundamentals
Programming Manual, 01/2015, 6FC5398-1BP40-5BA2
Command for thread cutting with linear increasing lead
Command for thread cutting with linear decreasing lead
End point(s) in Cartesian coordinates
Thread lead in X direction
Thread lead in Y direction
Motion commands
10.10 Thread cutting
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