HEIDENHAIN TNC 310 (286 140) - Manual (Page 215)

203 HEIDENHAIN TNC 310
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 Select the tool axis via soft 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 displayed traverse direction (if
necessary), press an arrow key.
ú To probe the upper surface, press the NC START
button
Calibrating the effective radius and compensating 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.
12.1 T
o
u
c
h
P
robe Cy
cles in the Manual Oper
ation Mode
5
Y
X
Z
Y
X
Z
10