HEIDENHAIN TNC 410 User Manual

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HEIDENHAIN TNC 410

Calibrating a triggering touch probe

The touch probe must be calibrated

■

its 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
changesin 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:

Set the datum in the tool axis such that for the machine tool table
Z=0.

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.

Select the tool axis via soft key.

Datum: Enter the height of the ring gauge.

The menu items Effective ball radius and Effective
length do not require input.

Move the touch probe to a position just above the ring
gauge.

To change the displayed traverse direction (if
necessary), press an arrow key.

To probe the upper surface of the ring gauge, press
the machine START button.

Calibrating the effective radius andcompensating center
misalignment
After the touch probe is inserted it normally needs to be exactly
aligned with the spindle axis. The misalignment is measured with
this calibration function and compensated electronically.

For this operation the TNC rotates the 3-D touch probe by 180°. The
rotation is initiated by a miscellaneous function that is set by the
machine tool builder in the machine parameter 6160.

The center misalignment is measured after the effective ball tip
radius is calibrated.

12.1 T

robe Cy

cles in the Manual and Electr

onic Handwheel Modes