HEIDENHAIN TNC 128 (77184x-02) - Manual (Page 473)

Before You Start Working with Touch Probe Cycles 20.2
20
TNC 128 | User's Manual HEIDENHAIN Conversational Programming | 5/2014
473
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 8
MIRROR IMAGE, Cycles 11 SCALING and 26 AXIS-
SPECIFIC SCALING).
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.