Two-Point Measurement G19 G778 - HEIDENHAIN CNC PILOT 640 User Manual

Touch probe cycles | Touch probe cycles for two-point measurement

Two-point measurement G19 G778

Cycle G778 measures two opposite points in the Y/Z plane with the
measuring axis Y. If the tolerance values defined in the cycle are
exceeded, the cycle saves the measured deviation either as tool
compensation or as an additive compensation. The result of the
measurement is saved additionally in the variable #i99.
Further information: "Touch probe cycles for automatic mode",
Page 521
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 Circumnav. dir. offset Xi RB and then by the
Offset in Yi RC. The cycle executes the second probing operation
in the opposite direction, saves the result and positions the touch
probe back with the circumnavigation axis by the circumnavigation
value.
The control outputs an error message if the touch probe does
not reach any touch point within the defined measuring path.
If a Max. 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 Max.
deviation WE, the program run is interrupted and an error message
is displayed.
Parameters:
R: Type of correction
1: Tool compensation DX/DZ for turning tool or additive
compensation
2: Recessing tool DX/DS
3: Milling tool DX/DD
4: Milling tool DD
K: Incr. meas path w/ Ri. (the algebraic sign determines the
probing direction) – maximum measuring path for probing
RB: Circumnav. dir. offset Xi – distance
RC: Offset in Yi – distance for pre-positioning before the second
measurement
YE: Target pos. noml value Y – absolute coordinate of touch
point
BD: Tolerance position +/ – measurement result range in which
no compensation is applied
Y: Nominal width in Y – coordinate for the second probing
position
BE: -Tolerance width +/ – range for the second measurement
result in which no compensation is applied
WT: Compens. no.1, measd. edge
T: Tool at turret position T to compensate the difference to
the nominal value
G149: Additive compensation D9xx to correct the difference
to the nominal value (only possible with compensation type
R = 1)
HEIDENHAIN | User's Manual smart.Turn and DIN Programming | 12/2017
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