HEIDENHAIN TNC 640 (34059x-05) Cycle programming - Manual (Page 485)

DATUM FROM OUTSIDE OF RECTANGLE (Cycle 411, DIN/ISO: G411) 15.5
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TNC 640 | User's Manual Cycle Programming | 1/2015
485
15.5 DATUM FROM OUTSIDE OF
RECTANGLE (Cycle 411, DIN/
ISO: G411)
Cycle run
Touch Probe Cycle 411 finds the center of a rectangular stud and
defines its center as datum. If desired, the TNC can also enter the
coordinates into a datum table or the 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 444) to touch point 1 . The
TNC calculates the touch points from the data in the cycle and
the safety clearance from the
SET_UP column of the touch
probe table.
2 Then the touch probe moves to the entered measuring height
and runs the first probing process at the probing feed rate
(column
F).
3 Then the touch probe moves either paraxially at measuring
height or at clearance height to the next starting point 2 and
probes the second touch point.
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 "Characteristics common to all
touch probe cycles for datum setting", page 472).
6 If desired, the TNC subsequently measures the datum in the
touch probe axis in a separate probing and saves the actual
values in the following Q parameters.
Parameter number Meaning
Q151 Actual value of center in reference axis
Q152 Actual value of center in minor axis
Q154 Actual value of length in the reference
axis
Q155 Actual value of length in the minor axis
Please note while programming:
Danger of collision!
To prevent a collision between touch probe and
workpiece, enter
high estimates for the lengths of
the 1st and 2nd sides.
Before a cycle definition you must have programmed
a tool call to define the touch probe axis.
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.