HEIDENHAIN SW 548328-05 DIN Programming - Manual (Page 451)

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451
5.4 Calibr
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Calibrate touch probe via two points G748
Cycle G748 measures two opposite points and computes the touch
probe adjustment dimension and the ball diameter. If the tolerance
values defined in the cycle are exceeded, the cycle corrects the touch
probe data. 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 along the defined
measuring axis 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. For the pre-positioning for the
second measurement, the cycle first moves the touch probe by the
offset in the circumnavigation direction RB and then by the offset in the
measuring direction RC. The cycle performs the second probing
operation in the opposite direction and saves the result.
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 points are
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: G748 Calibrate touch probe via two
points
. . .
MACHINING
N3 G748 K20 AC10 EC33 Q0 P0 H0
. . . Parameters
K Incremental measuring path with direction (signed): Maximum
measuring path for probing. The algebraic sign determines the
probing direction.
RB Circumnavigation direction offset: Distance
RC Measuring direction offset: Distance for pre-positioning before
the second measurement
AC Nominal value for target position: Absolute touch point
coordinate
EC Nominal width: Coordinate for the second probing position
BE Tolerance width +/-: Range for the second measurement result
in which no compensation is applied
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.
Q Tool orientation: Orient the touch probe in the programmed
probing direction before each probing operation (machine-
dependent function)
P PRINT outputs
 0: OFF: Do not show measuring results
 1: ON: Display measuring results