HEIDENHAIN SW 54843x-03 DIN Programming - Manual (Page 461)

HEIDENHAIN MANUALplus 620, CNC PILOT 640 461
5.2 T
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Zero point C axis, single-point measurement
G772
Cycle G772 measures with the C axis in the specified direction. 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 (See "Touch probe cycles for
automatic operation" on page 455.).
Cycle run
From the current position, the element to be probed is moved toward
the touch probe by a rotation of the C axis. When the workpiece
touches the stylus, the measured value is saved and the workpiece is
returned.
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.
Beispiel: G772—Single-point measurement zero
point C axis
. . .
MACHINING
N3 G772 R1 C20 AC0 BD0.2 Q0 P0 H0
. . .
Parameters
R
Type of zero point shift:
 1: Table and G152: Activate 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 Zero point shift no longer active after program run.
C Incremental measuring path with direction: Measuring path of
the C axis (in degrees), starting from the current position. The
algebraic sign determines the probing direction.
AC Nominal value for target position: Absolute coordinate of touch
point in degrees
BD Tolerance +/-: Measurement result range (in degrees) in which
no compensation is applied
KC Compensation offset: Additional compensation value that is
applied to the zero point result
WE Maximum deviation: Probe twice and monitor the dispersion of
the measured values
F Measuring feed rate: Feed rate for probing. If nothing is entered,
the measuring feed rate from the touch probe table is used. If
the entered measuring feed rate F is higher than the one in the
touch probe table, the feed rate is reduced to the value from the
touch probe table.