Measure angle (touch probe cycle 420, iso: g420), 3 a u to matic w o rk piece measur ement – HEIDENHAIN TNC 426B (280 472) Touch Probe Cycles User Manual
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3 Touch Probe Cycles for Automatic Workpiece Inspection
3.3 A
u
to
matic W
o
rk
piece Measur
ement
MEASURE ANGLE (touch probe cycle 420,
ISO: G420)
Touch probe cycle 420 measures the angle that any straight surface
on the workpiece describes with respect to the reference axis of the
working plane.
1
The TNC positions the touch probe to the starting points at rapid
traverse (value from MP6150 or MP6361) following the positioning
logic (see “Running touch probe cycles” on page 7) to the
programmed starting point
1
. The TNC offsets the touch probe by
the safety clearance in the direction opposite the defined traverse
direction.
2
Then the touch probe moves to the entered measuring height and
probes the first touch point at the probing feed rate (MP6120 or
MP6360).
3
Then the touch probe moves to the next starting position
2
and
probes the second position.
4
The TNC returns the touch probe to the clearance height and saves
the measured angle in the following Q parameter:
U
U
U
U
First measuring point in the 1st axis
Q263
(absolute): coordinate of the first touch point in the
reference axis of the working plane.
U
U
U
U
First measuring point in the 2nd axis
Q264
(absolute): coordinate of the first touch point in the
minor axis of the working plane.
U
U
U
U
Second measuring point in the 1st axis
Q265
(absolute): coordinate of the second touch point in the
reference axis of the working plane
U
U
U
U
Second measuring point in the 2nd axis
Q266
(absolute): coordinate of the second touch point in the
minor axis of the working plane
U
U
U
U
Measuring axis
Q272: axis in which the measurement
is to be made:
1: Reference axis = measuring axis
2: Minor axis = measuring axis
3: Touch probe axis = measuring axis
1
2
X
Y
Q266
Q264
Q263
Q272=1
Q265
Q272=2
+
–
–
+
Q267
MP6140
+
Q320
Parameter number
Meaning
Q150
The measured angle is referenced to the
reference axis of the machining plane.
Before programming, note the following:
Before a cycle definition you must have programmed a
tool call to define the touch probe axis.