HEIDENHAIN TNC 320 (340 551-01) - Manual (Page 424)

424 13 Touch Probe Cycles in the Manual and Electronic Handwheel Modes
13.4 Set
ting the D
a
tu
m with a 3-D T
o
uc
h Pr
obe
Circle center as datum
With this function, you can set the datum at the center of bore holes,
circular pockets, cylinders, studs, circular islands, etc.
Inside circle
The TNC automatically probes the inside wall in all four coordinate axis
directions.
For incomplete circles (circular arcs) you can choose the appropriate
probing direction.
8 Position the touch probe approximately in the center of the circle.
8 Select the probe function by pressing the PROBING
CC soft key
8 To probe the workpiece, press the machine START
button four times. The touch probe touches four
points on the inside of the circle.
8 If you are probing to find the stylus center (only
possible on machines with spindle orientation), press
the 180° soft key and probe another four points on the
inside of the circle.
8 If you are not probing to find the stylus center, press
the END key.
8 Datum: In the menu window, enter both datum
coordinates and confirm your entry with the SET
DATUM soft key
8 To terminate the probe function, press the END key.
Outside circle
8 Position the touch probe at the starting position for the first touch
point outside of the circle.
8 Select the probe direction by soft key.
8 To probe the workpiece, press the machine START button.
8 Repeat the probing process for the remaining three points. See
figure at lower right.
8 Datum: Enter the coordinates of the datum and confirm your entry
with the SET DATUM soft key.
8 To terminate the probe function, press the END key.
After the probing procedure is completed, the TNC displays the
coordinates of the circle center and the circle radius PR.
X
Y
X+ X–
Y+
Y–
X
Y
X+
X–
Y+
Y–