HEIDENHAIN TNC 320 (340 55x-04) Cycle programming - Manual (Page 283)

HEIDENHAIN TNC 320 283
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Executing touch probe cycles
All touch probe cycles are DEF active. This means that the TNC runs
the cycle automatically as soon as the TNC executes the cycle
definition in the program run.
Touch probe cycles with a number greater than 400 position the touch
probe according to a positioning logic:
„ If the current coordinate of the south pole of the stylus is less than
the coordinate of the clearance height (defined in the cycle), the TNC
retracts the touch probe in the probe axis to the clearance height
and then positions it in the working plane to the first starting
position.
„ If the current coordinate of the south pole of the stylus is greater
than the coordinate of the clearance height, the TNC first positions
the probe in the working plane to the first starting position and then
moves it immediately to the measuring height in the touch probe
axis.
Danger of collision!
When running touch probe cycles, no cycles must be
active for coordinate transformation (Cycle 7 DATUM,
Cycle 8 MIRROR IMAGE, Cycle 10 ROTATION, Cycles 11
and 26 SCALING and Cycle 19 WORKING PLANE or 3D-
ROT).
You can also run the Touch Probe Cycles 408 to 419 during
an active basic rotation. Make sure, however, that the
basic rotation angle does not change when you use Cycle
7 DATUM SHIFT with datum tables after the measuring
cycle.