HEIDENHAIN TNC 320 (340 55x-03) Touch Probe Cycles - Manual (Page 81)

HEIDENHAIN TNC 320 81
3.2 Pr
eset
ting aut
o
matically
DATUM FROM OUTSIDE OF CIRCLE
(touch probe cycle 413, DIN/ISO: G413)
Touch probe cycle 413 finds the center of a circular stud and defines
it as datum. If desired, the TNC can also enter the coordinates into a
datum table or the preset table.
1 The TNC positions the touch probe at rapid traverse (value from
FMAX column) following the positioning logic (see “Running touch
probe cycles” on page 21) to the starting point
1 . The TNC
calculates the probe starting 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).
The TNC derives the probing direction automatically from the
programmed starting angle.
3 Then the touch probe moves in a circular arc either 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 “Saving the calculated datum”
on page 64) and saves the actual values in the Q parameters listed
below
6 If desired, the TNC subsequently measures the datum in the touch
probe axis in a separate probing.
X
Y
1
2
4
3
Parameter number Meaning
Q151 Actual value of center in reference axis
Q152 Actual value of center in minor axis
Q153 Actual value of diameter
Before programming, note the following
To prevent a collision between touch probe and
workpiece, enter a high estimate for the nominal diameter
of the stud.
Before a cycle definition you must have programmed a
tool call to define the touch probe axis.