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Calibrating a 3-d touch trigger probe 13.6 – HEIDENHAIN TNC 320 (77185x-01) User Manual

Page 441

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Calibrating a 3-D touch trigger probe

13.6

13

TNC 320 | User's Manual

HEIDENHAIN Conversational Programming | 3/2014

441

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.