3 calibrating a measuring touch probe, Introduction, Course of actions – HEIDENHAIN TNC 426B (280 472) Touch Probe Cycles User Manual
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2 Touch Probe Cycles in the Manual and Electronic Handwheel Modes
2.3 Calibr
a
ting a Measur
ing T
ouc
h Pr
obe
2.3 Calibrating a Measuring Touch
Probe
Introduction
The 3-D calibration cycle for measuring touch probes enables you to
measure a standard ring gauge fully automatically. (The standard ring
gauge is available from HEIDENHAIN). Fix the standard ring gauge to
the machine table with fixing clamps.
From the data measured during calibration, the TNC calculates the
spring rate of the touch probe, the stylus deflection and the stylus
center misalignment. At the end of the calibration cycle, the TNC
automatically stores these values in the input menu.
Course of actions
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In the Manual Operation mode, position the touch probe to a
position approximately in the center of the standard ring gauge and
set it to 180°.
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To select the 3-D calibration cycle, press the 3D CAL
soft key
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Enter the values for stylus radius 1 and stylus radius 2.
Enter the same value for stylus radius 1 and 2 if you
are using a stylus with ball tip. Enter different values
for stylus radius 1 and 2 if you are using a stylus with
a corner radius.
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Diameter ring gauge: The diameter is engraved on the
standard ring gauge.
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To start the calibration cycle, press the machine START
button: The touch probe measures the standard ring
gauge in a programmed sequence of steps.
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Rotate the touch probe to 0° as soon as the TNC asks
you to.
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To start the calibration cycle once again to determine
center misalignment, press the machine START
button. The touch probe again measures the standard
ring gauge in a programmed sequence of steps.
If the TNC displays the error message "Stylus already in
contact," select the 3-D calibration menu and press the
RESET 3D soft key.
The measuring touch probe must be calibrated whenever
the machine parameters for 3-D touch probes are changed.
The effective length is calibrated in the same way as with
triggering touch probes. You must also enter tool radius R2
(corner radius).
With MP6321 you can define whether the TNC should
probe to find the stylus center.