HEIDENHAIN SW 54843x-02 DIN Programming - Manual (Page 466)

466 Touch probe cycles
5.7 Cir
c
ular measur
ement
Determine pitch circle G786
Cycle G786 determines the center and diameter of a pitch circle by
measuring three holes and shows the measured values on the control
screen. The result of the measurement is saved additionally in the
variable #i99. (See "Touch probe cycles for automatic operation" on
page 429.)
Cycle run
From the current position the touch probe moves in the defined
measuring plane toward the measuring point. When the stylus
touches the workpiece, the measured value is saved and the touch
probe is positioned back to the starting point. Another two probing
operations are carried out with the defined stepping angle. If a starting
diameter D was programmed, the cycle positions the touch probe on
a circular path before the respective measuring process.
The control outputs an error message if the touch probe does not
reach any touch point within the defined measuring path. If a
maximum deviation WE was programmed, the measuring point is
approached twice and the mean value is saved as result. If the
difference of the measurements is greater than the maximum
deviation WE, the program run is interrupted and an error message is
displayed.
Example: G786 Determine pitch circle
. . .
MACHINING
N3 G786 R0 K8 I0 J0 D50 WS50.1 WC49.9
BD0.1 BE0.1 P0 H0
. . .
Parameters
R
Type of zero point shift:
 0: X/Y plane G17: Probe circle in X/Y plane
 1: Z/X plane G18: Probe circle in Z/X plane
 2: Y/Z plane G19: Probe circle in Y/Z plane
K Incremental measuring path: Maximum measuring path for
measurement in the holes.
C Angle of 1st hole: Angle for the first probing operation
AC Angle of 2nd hole: Angle for the second probing operation
RC Angle of 3rd hole: Angle for the third probing operation
WB Position in infeed direction: Measuring height to which the
touch probe is positioned before the measuring process. No
input: The hole is probed from the current position.
I Pitch circle center in axis 1: Nominal position of the pitch circle
center in first axis
J Pitch circle center in axis 2: Nominal position of the pitch circle
center in second axis
D Nominal diameter: Diameter on which the touch probe is pre-
positioned before the measurements.
WS Max. diameter of pitch circle
WC Min. diameter of pitch circle
BD Tolerance for center in first axis
BE
Tolerance for center in second axis
WE Maximum deviation: Probe twice and monitor the dispersion of
the measured values