HEIDENHAIN TNC 620 (81760x-02) Cycle programming - Manual (Page 352)

Touch Probe Cycles: Automatic Datum Setting
14.8 DATUM FROM OUTSIDE OF CORNER (Cycle 414, DIN/ISO: G414,
software option 17)
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TNC 620 | User's Manual Cycle Programming | 2/2015
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.
The TNC always measures the first line in the
direction of the minor axis of the working plane.
By defining the positions of the measuring points
1 and 3 you also determine the corner at which the
TNC sets the datum (see figure at right and table
below).
Corner X coordinate Y coordinate
A Point 1 greater than point
3
Point 1 less than point 3
B Point 1 less than point 3 Point 1 less than point 3
C Point 1 less than point 3 Point 1 greater than point 3
D Point 1 greater than point
3
Point 1 greater than point 3