HEIDENHAIN TNC 620 (340 56x-02) Cycle programming - Manual (Page 336)

336 Touch Probe Cycles: Automatic Datum Setting
15.8 D
A
TUM FR
OM OUTSIDE OF CORNER (Cy
c
le 414, DIN/ISO: G414)
15.8 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” on page 283), 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 the respective traverse
direction.
2 Then the touch probe moves to the entered measuring height and
probes the first touch point at the probing feed rate (column F). The
TNC derives the probing direction automatically from the
programmed 3rd measuring point.
3 Then the touch probe moves to the next starting position 2 and
probes the second position.
4 The TNC positions the probe to starting point 3 and then to starting
point 4 to probe the third and fourth touch points.
5 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 “Saving the calculated datum”
on page 312) and saves the coordinates of the determined corner
in the Q parameters listed below
6 If desired, the TNC subsequently measures the datum in the touch
probe axis in a separate probing.
X
Y
1 2
4
3
X
Y
X
Y
X
Y
X
Y
A B
C D
1 2
3
2 1
3
1 2
3
2 1
3
Parameter number Meaning
Q151 Actual value of corner in reference axis
Q152 Actual value of corner in minor axis