Heidenhain TNC 320 (340 55x-03) Touch Probe Cycles User Manual download pdf (Page 36)

2.4 Setting the Datum with a 3-D Touch Probe

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 Datum: In the menu window, enter both coordinates

of the circle center, confirm with the SET DATUM

soft key, or write the values to a table (see “Writing

the measured values from touch probe cycles in

datum tables,” page 27, or see “Writing the

measured values from touch probe cycles in the

preset table,” page 28).

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, or write the values to a table (see

“Writing the measured values from touch probe cycles in datum

tables,” page 27, or see “Writing the measured values from touch

probe cycles in the preset table,” page 28).

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+X

Y+

Y

X+

X

Y+

Y

1 2 ... 31 32 33 34 35 36 37 38 39 40 41 ... 164 165

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