HEIDENHAIN SW 548328-05 DIN Programming - Manual (Page 466)

466
Touch probe cycles
5.7 Cir
c
ular measur
ement
5.7 Circular measurement
Circular measurement G785
Cycle G785 determines the circle center and diameter by probing
three times in the programmed plane 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 431.).
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: G785 Circular measurement
. . .
MACHINING
N3 G785 R0 BR0 K2 C0 RC60 I0 J0 Q0 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
BR Inside/outside:
 0: Inside: Probe inside diameter
 1: Outside: Probe outside diameter
K Incremental measuring path (signed): Maximum measuring path
for probing. The algebraic sign determines the probing direction.
C Angle of 1st measurement: Angle for the first probing operation
RC Incremental angle: Stepping angle for the subsequent probing
operations
D Starting diameter: Diameter on which the touch probe is pre-
positioned before the measurements.
WB Position in infeed direction: Measuring height to which the
touch probe is positioned before the measuring process. No
input: The circle is probed from the current position.
I Circle center in axis 1: Nominal position of the circle center in
first axis
J Circle center in axis 2: Nominal position of the circle center in
second axis
WE Maximum deviation: Probe twice and monitor the dispersion of
the measured values