HEIDENHAIN TNC 128 (77184x-01) - Manual (Page 297)

HEIDENHAIN TNC 128 297
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11.6 Calibrating a 3-D touch probe
Introduction
In order to precisely specify the actual trigger point of a 3-D touch
probe, you must calibrate the touch probe, otherwise the TNC cannot
provide precise measuring results.
During calibration, the TNC finds the "effective" length of the stylus
and the "effective" radius of the ball tip. To calibrate the 3-D touch
probe, clamp a ring gauge or a stud of known height and known radius
to the machine table.
The TNC provides calibration cycles for calibrating the length and the
radius:
 Press the TOUCH PROBE soft key
 Display the calibration cycles: Press CALIBRATE TS
 Select the calibration cycle
Calibration cycles of the TNC:
Always calibrate a touch probe in the following cases:
 Commissioning
 Stylus breakage
 Stylus exchange
 Change in the probe feed rate
 Irregularities caused, for example, when the machine
heats up
 Change of active tool axis
When you press the OK soft key after calibration, the
calibration values are applied to the active touch probe.
The updated tool data become effective immediately, and
a new tool call is not necessary.
Soft key Function Page
Calibrate the length Page 298
Measure the radius and the center
offset using a calibration ring Page 299
Measure the radius and the center
offset using a stud or a calibration pin Page 299