HEIDENHAIN TNC 320 User Manual page 409

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 four more probing operations. 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."
Proceed as follows for manual calibration using a calibration ring:
In the Manual Operation mode, position the ball tip inside the
bore of the ring gauge
Select the calibration function: Press the CAL. R
soft key
Enter the diameter of the ring gauge
Enter the safety clearance
New cal. spindle angle: Spindle angle that is used
for the calibration. The TNC uses CAL_ANG from
the touch probe table as a default value. If you
change the value, the TNC saves the value to the
touch probe table during calibration
Start the probing procedure: Press the machine
START button. The 3-D touch probe probes all
required touch points in an automatic probing
routine and calculates the effective ball-tip radius.
If probing from opposite orientations is possible,
the TNC calculates the center offset
Check the results (change the values if required)
Press the OK soft key for the values to take effect
Press the END soft key to terminate the calibrating
function
In order to be able to determine the ball-tip center
misalignment, the TNC needs to be specially
prepared by the machine manufacturer. Refer to your
machine manual.
TNC 320 | User's Manual HEIDENHAIN Conversational Programming | 5/2013
Calibrating a 3-D touch trigger probe
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