HEIDENHAIN TNC 426B (280 472) Touch Probe Cycles - Manual (Page 35)

HEIDENHAIN TNC 426, TNC 430 23
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Setting datum points using holes/cylindrical
studs
A second soft-key row provides soft keys for using holes or cylindrical
studs to set datums.
Define whether a hole or stud is to be probed
U U U U Select the probing functions with the TOUCH PROBE,
shift the soft-key row.
U U U U Select the probing function: For example, press the
PROBING ROT soft key.
U U U U Select holes or cylindrical studs: the selected element
appears in a box
Probing holes
Pre-position the touch probe approximately in the center of the hole.
After you have pressed the external START key, the TNC automatically
probes four points on the wall of the hole.
Move the touch probe to the next hole and have the TNC repeat the
probing procedure until all the holes have been probed to set datums.
Probing cylindrical studs
Position the ball tip at a starting position near the first touch point of
the stud. Select the probing direction by soft key and press the
machine START button to start probing. Perform the above procedure
four times.
Overview
Cycle Soft key
Basic rotation using 2 holes:
The TNC measures the angle between the line
connecting the centers of two holes and a nominal
position (angle reference axis).
Datum using 4 holes:
The TNC calculates the intersection of the line
connecting the first two probed holes with the line
connecting the last two probed holes. You need to
probe diagonally opposite holes one after another (as
shown on the soft key), as otherwise the datum
calculated by the TNC will be incorrect.
Circle center using 3 holes:
The TNC calculates a circle that intersects the centers
of all three holes, and finds the center.