HEIDENHAIN CNC PILOT 640 User Manual page 358

4
Internal or external threads: See algebraic sign of U
Number of cutting passes: The first cut is performed at the cutting
depth defined for I and is reduced with each cut until the tool
reaches the remaining cutting depth R.
Handwheel superposition (provided that your machine is equipped
accordingly): The superposition is limited to the following range:
X direction: Depending on the current cutting depth—without
exceeding the starting and end points of the thread
Z direction: Maximal 1 thread groove—without exceeding the
starting and end points of the thread
Definition of taper angle:
XS/ZS, X/Z
XS/ZS, Z, W
ZS, X/Z, W
NC stop – the control retracts the tool from the
thread groove and then stops all tool movements
Lift-off distance in the threadLiftOff machine
parameter (no. 601804)
If you are programming an internal thread, it is
advisable to preset the Thread pitch F since the
diameter of the longitudinal element is not the thread
diameter. If you have the control calculate the thread
pitch automatically, slight deviations may occur.
Example: G352
%352.nc
N1 T5 G97 S1500 M3
N2 G0 X13 Z4
N3 G352 X16 Z-28 XS13 ZS0 F1.5 U-999WE12
END
Cycle run:
1 Calculates the number of cutting passes
2 Executes a thread cut
3 Returns at rapid traverse and approaches for next pass
4 Repeats 2 to 3 until the complete thread has been cut
5 Executes air cuts
6 Returns to starting point
358
DIN/ISO programming | Thread cycles
HEIDENHAIN | User's Manual smart.Turn and DIN Programming | 12/2017