HEIDENHAIN TNC 406 - Manual (Page 53)

32 2 Manual Operation, Setup and Probing Functions
2.5 D
a
tu
m Set
ting with
a Pr
obing Electr
ode
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 Move the electrode to a position approximately in the center of the
circle.
8 To select the probe function, press PROBING CC.
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 Datum: Enter both circle center coordinates into the
menu window, and confirm your entry with ENT.
8 To terminate the probe function, press the END key.
Outside circle
8 To select the probe function, press PROBING CC.
8 Move the probing electrode to a position near the first
touch point outside of the circle.
8 Select the probe direction with a 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 Enter the coordinates of the circle center.
After the probing procedure is completed, the TNC displays the
coordinates of the circle center and the circle radius PR on the
monitor.
X
Y
X+ X–
Y+
Y–
X
Y
X+
X–
Y+
Y–