HEIDENHAIN TNC 620 (81760x-02) Cycle programming - Manual (Page 328)

Touch Probe Cycles: Automatic Datum Setting
14.2 DATUM SLOT CENTER (Cycle 408, DIN/ISO: G408, software option
17)
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TNC 620 | User's Manual Cycle Programming | 2/2015
14.2 DATUM SLOT CENTER (Cycle 408,
DIN/ISO: G408, software option 17)
Cycle run
Touch Probe Cycle 408 finds the center of a slot 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 298) 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 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 326) and saves the
actual values in the Q parameters listed below.
5 If desired, the TNC subsequently measures the datum in the
touch probe axis in a separate probing.
Parameter number Meaning
Q166 Actual value of measured slot width
Q157 Actual value of the centerline