
B–63523EN–1/03
11. PROGRAM COMMAND
1443
Measurement sequence:
1) The probe moves to the center of the first bolt hole at the speed fa.
2) The probe moves at the speed fa in the negative Z–axis direction to a
point the distance Z away from the measurement start point.
3) The probe moves at the speed fa in the positive X–axis direction to a
point the distance ”D/2 – a – stylus ball radius” away from the
measurement start point.
4) The probe moves at the speed f in the range ”D/2 + g – stylus ball
radius” until it touches the measurement face.
5) The probe moves at the rapid traverse rate to the center X coordinate
where it was before the start of measurement, and makes the same
measurement as stated above in the negative X–axis direction and the
Y–axis direction (the first measurement session).
6) The probe moves at the speed fa in the positive X–axis direction to a
point the distance ”first–measurement session measurement position
– b” away from the measurement start point.
7) The probe moves at the specified speed F in the range ”b + g” until it
touches the measurement face.
8) The probe makes the same measurement as stated above in the
negative X–axis direction and the Y–axis direction to obtain the center
position of the first bolt hole (the second measurement session).
9) The probe makes the same measurement as stated above for the second
bolt hole to obtain its center position.
10) The probe makes the same measurement as stated above for the third
bolt hole to obtain its center position.
Executing G189 obtains the center of the bolt hole circle and its radius
from measured values, and outputs the obtained values to the
W–specified workpiece zero point offset value and the following macro
variables:
#250: Center X coordinate of the bolt hole circle (machine coordinate
system)
#251: Center Y coordinate of the bolt hole circle (machine coordinate
system)
#252: Center X coordinate of the bolt hole circle (workpiece
coordinate system)
#253: Center Y coordinate of the bolt hole circle (workpiece
coordinate system)
#254: Radius of the bolt hole circle