HEIDENHAIN TNC 426B (280 472) ISO programming - Manual (Page 313)

12 3-D Touch Probes 298
Calibrating a touch trigger probe
The touch probe must be calibrated:
■ during commissioning
■ when the stylus breaks
■ when the stylus is changed
■ when the probe feed rate is changed
■ in case of irregularities such as those resulting from
thermal changes in the machine
During calibration, the TNC finds the “effective” length of the stylus
and the “effective” radius of the ball tip. To calibrate the touch
probe, clamp a ring gauge of known height and known internal
radius to the machine table.
To calibrate the effective length:
ú Set the datum in the tool axis such that for the machine tool table
Z=0.
ú To select the calibration function for the touch probe
length, press the TOUCH PROBE and CAL L soft keys.
The TNC then displays a menu window with four input
fields.
ú Enter the tool axis (with the axis key).
ú Datum: Enter the height of the ring gauge.
ú The menu items Effective ball radius and Effective
length do not require input.
ú Move the touch probe to a position just above the ring
gauge.
ú To change the traverse direction (if necessary) press a
soft key or an arrow key.
ú To probe the upper surface of the ring gauge, press
the machine START button.
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