HEIDENHAIN TNC 426B (280 472) Touch Probe Cycles - Manual (Page 100)

88 3 Touch Probe Cycles for Automatic Workpiece Inspection
3.3 A
u
to
matic W
o
rk
piece Measur
ement
MEASURE INSIDE WIDTH (touch probe
cycle 425, 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 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 starting
point
1 . The TNC calculates the probe starting points from the data
in the cycle and the safety clearance from MP6140.
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). 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:
2
1
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.