HEIDENHAIN TNC 128 (77184x-01) - Manual (Page 474)

474 Touch probe cycles
20.5 Calibr
a
ting the T
T
(Cy
c
le 480)
20.5 Calibrating the TT (Cycle 480)
Cycle run
The TT is calibrated with the measuring cycle TCHPROBE 480. The
calibration process is automatic. The TNC also measures the center
misalignment of the calibrating tool automatically by rotating the
spindle by 180° after the first half of the calibration cycle.
The calibrating tool must be a precisely cylindrical part, for example a
cylinder pin. The resulting calibration values are stored in the TNC
memory and are accounted for during subsequent tool measurement.
Please note while programming:
Cycle parameters
 Clearance height: Enter the position in the spindle
axis at which there is no danger of collision with the
workpiece or fixtures. The clearance height is
referenced to the active workpiece datum. If you
enter such a small clearance height that the tool tip
would lie below the level of the probe contact, the
TNC automatically positions the tool above the level
of the probe contact (safety zone from
safetyDistStylus). Input range -99999.9999 to
99999.9999
The functioning of the calibration cycle is dependent on
machine parameter CfgToolMeasurement. Refer to your
machine manual.
Before calibrating the touch probe, you must enter the
exact length and radius of the calibrating tool into the tool
table TOOL.T.
The position of the TT within the machine working space
must be defined by setting the Machine Parameters
centerPos
> [0] to [2].
If you change the setting of any of the Machine
Parameters centerPos > [0] to [2], you must recalibrate.
Example: NC blocks
6 TOOL CALL 1 Z
7 TCH PROBE 480 CALIBRATE TT
Q260=+100 ;CLEARANCE HEIGHT