HEIDENHAIN iTNC 530 475
14.7 Calibrating a 3-D Touch Probe
14.7 Calibrating a 3-D Touch Probe
Introduction
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.
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 of known height and known internal radius
to the machine table.
Calibrating the effective length
U Set the datum in the spindle axis such that for the machine tool table
Z=0.
U 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.
U Enter the tool axis (with the axis key).
U Datum: Enter the height of the ring gauge.
U The menu items Effective ball radius and Effective
length do not require input.
U Move the touch probe to a position just above the ring
gauge.
U To change the traverse direction (if necessary), press
a soft key or an arrow key.
U To probe the upper surface of the ring gauge, press
the machine START button.
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
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