HEIDENHAIN TNC 320 (340 55x-03) Touch Probe Cycles - Manual (Page 126)

126
3.3 A
u
to
matic W
o
rk
piece Measur
ement
MEASURE INSIDE WIDTH (touch probe cycle 425,
DIN/ISO: G425)
Touch probe cycle 425 measures the position and width of a slot (or
pocket). 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 a system parameter.
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).
1. The first probing is always in the positive direction of the
programmed axis.
3 If you enter an offset for the second measurement, the TNC then
moves the touch probe paraxially to the next starting point
2 and
probes the second touch point. If you do not enter an offset, the
TNC measures the width in the exact opposite direction.
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:
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.