HEIDENHAIN TNC 426B (280 472) Touch Probe Cycles - Manual (Page 106)

94 3 Touch Probe Cycles for Automatic Workpiece Inspection
3.3 A
u
to
matic W
o
rk
piece Measur
ement
MEASURE BOLT HOLE CIRCLE (touch probe
cycle 430, ISO: G430)
Touch probe cycle 430 finds the center and diameter of a bolt hole
circle by probing three holes. If you define the corresponding tolerance
values in the cycle, the TNC makes a nominal-to-actual value
comparison and saves the deviation in system parameters.
1 Following the positioning logic (see “Running touch probe cycles”
on page 7), the TNC positions the touch probe at rapid traverse
(value from MP6150 or MP6361) to the point entered as center of
the first hole
1 .
2 Then the probe moves to the entered measuring height and
probes four points to find the first hole center.
3 The touch probe returns to the clearance height and then to the
position entered as center of the second hole
2 .
4 The TNC moves the touch probe to the entered measuring height
and probes four points to find the second hole center.
5 The touch probe returns to the clearance height and then to the
position entered as center of the third hole
3 .
6 The TNC moves the touch probe to the entered measuring height
and probes four points to find the third hole center.
7 Finally the TNC returns the touch probe to the clearance height and
saves the actual values and the deviations in the following
Q parameters:
1
2
3
Parameter number Meaning
Q151 Actual value of center in reference axis
Q152 Actual value of center in minor axis
Q153 Actual value of bolt hole circle diameter
Q161 Deviation from center of reference axis
Q162 Deviation from center of minor axis
Q163 Deviation of bolt hole circle diameter
Before programming, note the following:
Before a cycle definition you must have programmed a
tool call to define the touch probe axis.