HEIDENHAIN TNC 320 (340 55x-03) Touch Probe Cycles - Manual (Page 128)

128
3.3 A
u
to
matic W
o
rk
piece Measur
ement
MEASURE OUTER RIDGE (touch probe cycle 426,
DIN/ISO: G426)
Touch probe cycle 426 measures the position and width of a ridge. If
you define the corresponding tolerance values in the cycle, the TNC
makes a nominal-to-actual value comparison and saves the deviation
value in system parameters.
1 The TNC positions the touch probe at rapid traverse (value from
FMAX column) following the positioning logic (see “Running touch
probe cycles” on page 21) to the starting point
1 . The TNC
calculates the probe starting points from the data in the cycle and
the safety clearance from the SET_UP column of the touch probe
table
2 Then the touch probe moves to the entered measuring height and
runs the first probing process at the probing feed rate (column F).
The first probing is always in the negative direction of the
programmed axis.
3 Then the touch probe moves at clearance height to the next
starting position and probes the second touch point.
4 Finally the TNC returns the touch probe to the clearance height and
saves the actual values and the deviation in the following Q
parameters:
8 First measuring point in the 1st axis Q263
(absolute): Coordinate of the first touch point in the
reference axis of the working plane.
8 First measuring point in the 2nd axis Q264
(absolute): Coordinate of the first touch point in the
minor axis of the working plane.
8 Second measuring point in the 1st axis Q265
(absolute): Coordinate of the second touch point in
the reference axis of the working plane.
8 Second measuring point in the 2nd axis Q266
(absolute): Coordinate of the second touch point in
the minor axis of the working plane.
X
Y
1
2
Parameter number Meaning
Q156 Actual value of measured length
Q157 Actual value of the centerline
Q166 Deviation of the measured length
Before programming, note the following
Before a cycle definition you must have programmed a
tool call to define the touch probe axis.
MP6140 + Q320
Q264
Q265
X
Y
Q289
Q311
Q288
Q272=1
Q272=2
Q266
Q263