HEIDENHAIN TNC 640 (34059x-04) Cycle programming - Manual (Page 476)

Touch Probe Cycles: Automatic Datum Setting
16.11 DATUM IN TOUCH PROBE AXIS (Cycle 417, DIN/ISO: G417)
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TNC 640 | User's Manual Cycle Programming | 3/2014
16.11 DATUM IN TOUCH PROBE AXIS (Cycle
417, DIN/ISO: G417)
Cycle run
Touch Probe Cycle 417 measures any coordinate in the touch probe
axis and defines it as datum. If desired, the TNC can also enter the
measured coordinate in a datum table or 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 410) to the programmed
touch point
1 . The TNC offsets the touch probe by the safety
clearance in the positive direction of the touch probe axis.
2 Then the touch probe moves in its own axis to the coordinate
entered as starting point 1 and measures the actual position
with a simple probing movement.
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 438) and saves the
actual value in the Q parameters listed below.
Parameter number Meaning
Q160 Actual value of measured point
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 then sets the datum in this axis.