HEIDENHAIN TNC 620 (34056x-04) Cycle programming - Manual (Page 336)

Touch Probe Cycles: Automatic Datum Setting
15.9 DATUM FROM INSIDE OF CORNER (Cycle 415, DIN/ISO: G415,
software option 17)
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TNC 620 | User's Manual Cycle Programming | 5/2013
15.9 DATUM FROM INSIDE OF CORNER
(Cycle 415, DIN/ISO: G415, software
option 17)
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 (See "Executing touch probe
cycles", page 280), the TNC positions the touch probe at rapid
traverse (value from
FMAX column) to the first 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 306) 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
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.