Calc. Of Pitch Circle G786 - HEIDENHAIN CNC PILOT 640 User Manual

5

Calc. of pitch circle G786

Cycle G786 determines the center and diameter of a pitch circle
by measuring three holes and shows the measured values on the
control screen. The result of the measurement is saved additionally
in the variable #i99.
Further information:
Page 521
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 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: Measuring plane
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
K: Measuring path (the algebraic sign determines the probing
direction) – maximum measuring path for probing
C: Angle of 1st hole – angle for the first probing operation
AC: Angle of 2nd hole – angle for the second probing operation
RC: Angle of 3rd hole – angle for the third probing operation
WB: Position in infeed direct. – measuring height to which
the touch probe is positioned before the measuring process (no
input: The circle is probed from the current position)
I: Circ. scale center in axis 1 – nominal position of the circle
center in first axis
J: Circ. scale center in axis 2 – nominal position of the circle
center in second axis
D: Nominal diameter – diameter on which the touch probe is
pre-positioned before the measurements
WS: Upper tol., calcultd. dia. of pitch circle
WC: Lower tol., calcultd. dia. of pitch circle
BD: Tol. of center in axis 1
BE: Tol. of center in axis 2
WE: Max. deviation – probe twice and monitor the dispersion
of the measured values
558
"Touch probe cycles for automatic mode",
Touch probe cycles | Circular measurement
HEIDENHAIN | User's Manual smart.Turn and DIN Programming | 12/2017