HEIDENHAIN SW 54843x-02 DIN Programming - Manual (Page 458)

458 Touch probe cycles
5.6 Sear
c
h
cy
cles
Find hole in C lateral surface G781
Cycle G780 probes the lateral surface of a workpiece several times
with the X axis. Prior to each probing, the C axis is rotated by a
distance defined in the cycle until a hole is found. Optionally, the cycle
determines the mean value by two probing operations in the hole.
If the tolerance value defined in the cycle is exceeded, the cycle saves
the measured deviation as zero point shift. The result of the
measurement is saved additionally in the variable #i99.
Cycle run
From the current position the touch probe moves along the measuring
axis X 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. Then the cycle rotates the C axis
by the angle defined in the Search Grid parameter RC and probes again
with the X axis. This process is repeated until a hole is found. In the
hole the cycle performs two probing operations with the C axis,
calculates the center of the hole and sets the zero point in the C axis.
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: G781 Find hole in C face
. . .
MACHINING
N3 G781 R1 D1 K2 C0 RC10 IC20 AC0 BD0.2 Q0
P0 H0
. . .
Result #i99 Meaning
< 999997 Result of first measurement
999999 Deviation of probing operations was higher than
programmed in Maximum Deviation parameter WE.
Parameters
R
Type of zero point shift:
 1: Activate table and G152 zero point shift and additionally
save in zero point table. The zero-point shift also remains
active after the program run.
 2: Activate zero point shift with G152 for the further program
run. Zero point shift no longer active after program run.
D Result:
 1: Position: Set zero point without determining the hole
center. No probing operation in the hole.
 2: Object center: Before the zero point is set, determine hole
center in two probing operations with the C axis
K Incremental measuring path X (signed): Maximum measuring
path for probing. The algebraic sign determines the probing
direction.
C Starting position C: Position of the C axis for the first probing
operation
RC Search grid Ci: Stepping angle of the C axis for the subsequent
probing operations
A Number of points: Maximum number of probing operations