HEIDENHAIN TNC 640 User Manual page 704

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Select the probing function: Press the

PROBING CC soft key

Hole should be probed automatically: Press the

HOLE soft key

Select paraxial probing direction

Start probing function: Press the NC start key

The control carries out all pre-positioning and

probing processes automatically.

The control approaches the position at the feed rate FMAX defined

in the touch probe table. The defined probing feed rate F is used for

the actual probing operation.

Operating and programming notes:

Before starting an automatic probing routine, you

need to preposition the touch probe near the first

touch point. Offset the touch probe by approximately

the safety clearance opposite to the probing

direction. The safety clearance is derived from the

sum of the values in the touch-probe table and in the

For inside circles with large diameters, the control

can also position the touch probe on a circular

arc at the feed rate FMAX. This requires that you

enter a safety clearance for prepositioning and the

hole diameter in the input form. Position the touch

probe inside the hole at a position that is offset by

approximately the safety clearance from the wall.

Take the starting angle of the first probing process

into account in pre-positioning; for example, at a

starting angle of 0° the control will first probe in the

positive direction of the reference axis.

Manual Operation and Setup | Using a 3-D touch probe

HEIDENHAIN | TNC 640 | ISO Programming User's Manual | 10/2017