HEIDENHAIN TNC 640 (34059x-02) Cycle programming - Manual (Page 444)

Touch Probe Cycles: Automatic Datum Setting
16.8 DATUM FROM OUTSIDE OF CORNER (Cycle 414, DIN/ISO: G414)
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TNC 640 | User's Manual Cycle Programming | 5/2013
16.8 DATUM FROM OUTSIDE OF CORNER
(Cycle 414, DIN/ISO: G414)
Cycle run
Touch Probe Cycle 414 finds the intersection of two lines and
defines it as the datum. If desired, the TNC can also enter the
intersection into a datum table or preset table.
1 Following the positioning logic (See "Executing touch probe
cycles", page 392), the TNC positions the touch probe at rapid
traverse (value from
FMAX column) to the first touch point 1
(see figure at upper right). The TNC offsets the touch probe by
the safety clearance in the direction opposite to the respective
traverse direction.
2 Then the touch probe moves to the entered measuring height
and runs the first probing process at the probing feed rate
(column
F). The TNC derives the probing direction automatically
from the programmed 3rd measuring point.
1 Then the touch probe moves to the next starting position 2 and
from there probes the second position.
2 The TNC positions the probe to starting point 3 and then to
starting point 4 to probe the third and fourth touch points.
3 Finally the TNC returns the touch probe to the clearance height
and processes the determined datum depending on the cycle
parameters Q303 and Q305 (See "Characteristics common to all
touch probe cycles for datum setting", page 418) and saves the
coordinates of the determined corner in the Q parameters listed
below.
4 If desired, the TNC subsequently measures the datum in the
touch probe axis in a separate probing.
Parameter number Meaning
Q151 Actual value of corner in reference
axis
Q152 Actual value of corner in minor axis