HEIDENHAIN TNC 620 (34056x-04) Cycle programming - Manual (Page 280)

Using Touch Probe Cycles
13.2 Before You Start Working with Touch Probe Cycles
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TNC 620 | User's Manual Cycle Programming | 5/2013
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.
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, and
Cycles 11 and 26 SCALING).
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.
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 stylus south pole is greater
than the coordinate of the clearance height, then the TNC first
positions the touch probe to the first probe point in the working
plane, and then in the touch-probe axis directly to the measuring
height.