HEIDENHAIN TNC 620 (340 56x-02) Cycle programming - Manual (Page 392)

392 Touch Probe Cycles: Automatic Workpiece Inspection
16.9 MEA
S
URE INSIDE WIDTH (Cy
c
le 425, DIN/ISO: G425)
16.9 MEASURE INSIDE WIDTH
(Cycle 425, DIN/ISO: G425)
Cycle run
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 point 1 at rapid
traverse (value from FMAX column) following the positioning logic
(see “Executing touch probe cycles” on page 283). The TNC
calculates the touch 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). 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 (if required, at clearance height) to the next
starting point
2 and probes the second touch point. If the nominal
length is large, the TNC moves the touch probe to the second
touch point at rapid traverse. 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:
Please note while programming:
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 a cycle definition you must have programmed a
tool call to define the touch probe axis.