HEIDENHAIN TNC 320 User Manual page 433

Position the touch probe approximately in the center of the hole
(inside circle) or near the first touch point on the stud (outside
circle), and select the soft key for the first probing direction. Once
you press the machine START button to start the touch probe cycle,
the TNC automatically performs all prepositioning movements and
probing operations.
The TNC positions the touch probe to the individual touch points,
taking the safety clearance into account. If a clearance height has
been defined, the TNC positions the touch probe to clearance
height in the spindle axis beforehand.
The TNC 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.
Before starting the automatic probing routine, you
need to preposition the touch probe near the first
touch point. Offset the touch probe by approximately
the safety clearance (value from touch probe table
+ value from input form) opposite to the probing
direction.
For an inside circle with a large diameter, the TNC
can also preposition the touch probe on a circular
arc at the positioning 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. For prepositioning, keep in mind the starting
angle for the first probing operation (with an angle
of 0°, the TNC probes in the positive direction of the
principal axis).
TNC 320 | User's Manual
HEIDENHAIN Conversational Programming | 3/2014
Using 3-D touch probes
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