HEIDENHAIN TNC 128 (77184x-02) - Manual (Page 302)

Manual operation and setup
11.6 Calibrating a 3-D touch trigger probe (Touch Probe Functions
software option 17)
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TNC 128 | User's Manual HEIDENHAIN Conversational Programming | 5/2014
Calibrating the effective radius and compensating
center misalignment
HEIDENHAIN only gives warranty for the function of
the probing cycles if HEIDENHAIN touch probes are
used.
The center offset can be determined only with a
suitable touch probe.
If you want to calibrate using the outside of an
object, you need to preposition the touch probe
above the center of the calibration sphere or
calibration pin. Ensure that the touch points can be
approached without collision.
When calibrating the ball tip radius, the TNC executes an automatic
probing routine. During the first probing cycle, the TNC determines
the center of the calibration ring or stud (coarse measurement)
and positions the touch probe in the center. Then the ball tip
radius is determined during the actual calibration process (fine
measurement). If the touch probe allows probing from opposite
orientations, the center offset is determined during another cycle.
The characteristic of whether and how your touch probe can be
oriented is already defined in HEIDENHAIN touch probes. Other
touch probes are configured by the machine tool builder.