HEIDENHAIN TNC 640 (34059x-05) Cycle programming - Manual (Page 539)

MEASURE RECTANGLE INSIDE (Cycle 423, DIN/ISO: G423) 16.7
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TNC 640 | User's Manual Cycle Programming | 1/2015
539
16.7 MEASURE RECTANGLE INSIDE
(Cycle 423, DIN/ISO: G423)
Cycle run
Touch Probe Cycle 423 finds the center, length and width of a
rectangular pocket. If you define the corresponding tolerance
values in the cycle, the TNC makes a nominal-to-actual value
comparison and saves the deviation value in system parameters.
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 saves the actual values and the deviations 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
Q161 Deviation at center of reference axis
Q162 Deviation at center of minor axis
Q164 Deviation of side length in reference
axis
Q165 Deviation of side length in minor axis
Please note while programming:
Before a cycle definition you must have programmed
a tool call to define the touch probe axis.
If the dimensions of the pocket and the safety
clearance do not permit pre-positioning in the
proximity of the touch points, the TNC always starts
probing from the center of the pocket. In this case
the touch probe does not return to the clearance
height between the four measuring points.