HEIDENHAIN TNC 640 (34059x-04) Cycle programming - Manual (Page 468)

Touch Probe Cycles: Automatic Datum Setting
16.9 DATUM FROM INSIDE OF CORNER (Cycle 415, DIN/ISO: G415)
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TNC 640 | User's Manual Cycle Programming | 3/2014
16.9 DATUM FROM INSIDE OF CORNER
(Cycle 415, DIN/ISO: G415)
Cycle run
Touch Probe Cycle 415 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, the TNC positions the touch
probe at rapid traverse (value from
FMAX column) (see
"Executing touch probe cycles", page 410) to touch point
1
(see
figure at upper right) that you have defined in the cycle. 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 probing direction is derived from the number by
which you identify the corner.
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 438) 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