2 calibrating a touch trigger probe, Introduction, Calibrating the effective length – HEIDENHAIN TNC 426B (280 472) Touch Probe Cycles User Manual
Page 25: Calibrate the effective length
HEIDENHAIN TNC 426, TNC 430
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2.2 Calibr
a
ting a T
ouc
h T
rigg
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r Pr
obe
2.2 Calibrating a Touch Trigger
Probe
Introduction
The touch probe must be calibrated in the following cases:
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Commissioning
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Stylus breakage
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Stylus exchange
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Change in the probe feed rate
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Irregularities caused, for example, when the machine heats up
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.
Calibrating the effective length
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Set the datum in the spindle axis such that for the machine tool table
Z=0.
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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.
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Enter the tool axis (with the axis key).
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Datum: Enter the height of the ring gauge.
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The menu items Effective ball radius and Effective
length do not require input.
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Move the touch probe to a position just above the ring
gauge.
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To change the traverse direction (if necessary) press a
soft key or an arrow key.
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To probe the upper surface of the ring gauge, press
the machine START button.
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Z