16.4 Calibrating A Touch Trigger Probe - HEIDENHAIN TNC 620 User Manual

Touch Probe Cycles: Special Functions | Calibrating a touch trigger probe

16.4 Calibrating a touch trigger probe

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.
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
The TNC assumes the calibration values for the active
probe system directly after the calibration process. The
updated tool data become effective immediately, and a
new tool call is not necessary.
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
Soft key Function
Calibrating the length
Measure the radius and the center
offset using a calibration ring
Measure the radius and the center
offset using a stud or a calibration
pin
Measure the radius and the center
offset using a calibration sphere
HEIDENHAIN | TNC 620 | User's manual for cycle programming | 10/2017
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