HEIDENHAIN TNC 640 (34059x-02) Cycle programming - Manual (Page 458)

Touch Probe Cycles: Automatic Datum Setting
16.12 DATUM AT CENTER OF 4 HOLES (Cycle 418, DIN/ISO: G418)
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TNC 640 | User's Manual Cycle Programming | 5/2013
Please note while programming:
Danger of collision!
If you set a datum (Q303 = 0) with the touch probe
cycle and also use probe in TS axis (Q381 = 1), then
no coordinate transformation must be active.
Before a cycle definition you must have programmed
a tool call to define the touch probe axis.
Cycle parameters
1st hole: Center in 1st axis Q268 (absolute):
Center of the first hole in the reference axis of
the working plane. Input range -99999.9999 to
99999.9999
1st hole: Center in 2nd axis Q269 (absolute):
Center of the first hole in the minor axis of
the working plane. Input range -99999.9999 to
99999.9999
2nd hole: Center in 1st axis Q270 (absolute):
Center of the second hole in the reference axis
of the working plane. Input range -99999.9999 to
99999.9999
2nd hole: Center in 2nd axis Q271 (absolute):
Center of the second hole in the minor axis of
the working plane. Input range -99999.9999 to
99999.9999
3rd center in 1st axis Q316 (absolute): center of
the 3rd hole in the reference axis of the working
plane. Input range -99999.9999 to 99999.9999