HEIDENHAIN TNC 640 (34059x-04) ISO programming - Manual (Page 502)

Manual operation and setup
15.9 Datum Setting with 3-D Touch Probe
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TNC 640 | User's Manual for DIN/ISO Programming | 3/2014
Outside circle:
Position the touch probe at a position near the first touch point
outside of the circle
Select the probe direction by soft key
Probing: Press the machine START button. If you are not
using the automatic probing routine, you need to repeat this
procedure. After the third probing operation, you can have the
TNC calculate the center (four touch points are recommended).
Terminate the probing procedure and switch to the evaluation
menu: Press the EVALUATE soft key
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 measured values from the touch probe
cycles in a datum table", page 488, or See "Writing measured
values from the touch probe cycles in the preset table",
page 489)
To terminate the probe function, press the
END soft key
After the probing procedure is completed, the TNC displays the
current coordinates of the circle center and the circle radius PR.
Setting the datum using multiple holes/cylindrical studs
A second soft-key row provides a soft key for using multiple holes
or cylindrical studs to set the datum. You can set the intersection of
two or more elements as datum.
Select the probing function for the intersection of holes/cylindrical
studs:
Select the touch probe function: Press the
PROBING CC soft key
Hole is to be probed automatically:
Define by soft key
Circular stud is to be probed automatically:
Define by soft key
Preposition the touch probe approximately in the center of the hole
or near the first touch point of the circular stud. After you have
pressed the NC Start key, the TNC automatically probes the points
on the circle.
Move the touch probe to the next hole, repeat the probing
operation and have the TNC repeat the probing procedure until all
the holes have been probed to set the datum.