HEIDENHAIN TNC 320 (340 55x-03) Touch Probe Cycles - Manual (Page 123)

HEIDENHAIN TNC 320 123
3.3 A
u
to
matic W
o
rk
piece Measur
ement
MEASURE RECTANGLE FROM OUTSIDE
(touch probe cycle 424, ISO: G424)
Touch probe cycle 424 finds the center, length and width of a
rectangular stud. 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
probes the first touch point at the probing feed rate (column F).
3 Then the touch probe moves either paraxially at the measuring
height or linearly at the clearance height to the next starting point
2 and probes the second touch point.
4 The TNC positions the probe to starting point 3 and then to starting
point 4 to probe the third and fourth touch points.
5 Finally the TNC returns the touch probe to the clearance height and
saves the actual values and the deviations in the following Q
parameters:
X
Y
1
2
3
4
Parameter number Meaning
Q151 Actual value of center in reference axis
Q152 Actual value of center in minor axis
Q154 Actual value of length in the reference
axis
Q155 Actual value of length in the minor axis
Q161 Deviation from center of reference axis
Q162 Deviation from center of minor axis
Q164 Deviation of length in reference axis
Q165 Deviation of length in minor axis
Before programming, note the following
Before a cycle definition you must have programmed a
tool call to define the touch probe axis.