HEIDENHAIN TNC 620 (81760x-02) ISO programming - Manual (Page 470)

Manual operation and setup
14.8 Calibrating a 3-D touch trigger probe (option 17)
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TNC 620 | User's ManualDIN/ISO Programming | 2/2015
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.
After the touch probe is inserted, it normally needs to be aligned
exactly with the spindle axis. The calibration function can
determine the offset between touch-probe axis and spindle axis
by probing from opposite orientations (rotation by 180°) and can
compute the compensation.
The calibration routine varies depending on how your touch probe
can be oriented:
No orientation possible or orientation possible in only one
direction: The TNC executes one approximate and one fine
measurement and determines the effective ball tip radius
(column R in tool.t)
Orientation possible in two directions (e.g.. HEIDENHAIN touch
probes with cable): The TNC executes one approximate and
one fine measurement, rotates the touch probe by 180° and
then executes one more probing operation. The center offset
(CAL_OF in tchprobe.tp) is determined in addition to the radius
by probing from opposite orientations.
Any orientation possible (e.g. HEIDENHAIN infrared touch
probes): For probing routine, see "orientation possible in two
directions."