HEIDENHAIN TNC 320 User Manual page 357

15.13 DATUM IN ONE AXIS
(Cycle 419, DIN/ISO: G419)
Cycle run
Touch Probe Cycle 419 measures any coordinate in any axis and
defines it as datum. If desired, the TNC can also enter the measured
coordinate in a datum table or preset table.
1 The TNC positions the touch probe at rapid traverse (value from
FMAX column) following the positioning logic (see "Executing
touch probe cycles" on page 285) to the programmed starting
point 1. The TNC offsets the touch probe by the safety clearance
in the direction opposite the programmed probing direction.
2 Then the touch probe moves to the programmed measuring height
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 "Saving the calculated datum"
on page 314).
Please note while programming:
Before a cycle definition you must have programmed a
tool call to define the touch probe axis.
If you use Cycle 419 several times in succession to save
the datum in more than one axis in the preset table, you
must activate the preset number last written to by Cycle
419 after every execution of Cycle 419 (this is not required
if you overwrite the active preset).
HEIDENHAIN TNC 320 357