HEIDENHAIN TNC 320 (340 55x-03) Touch Probe Cycles - Manual (Page 96)

96
3.2 Pr
eset
ting aut
o
matically
Datum at center of 4 holes (touch probe cycle
418, DIN/ISO: G418)
Touch probe cycle 418 calculates the intersection of the lines
connecting opposite corners of a rectangle defined by four hole
centers. If desired, the TNC can also enter the intersection into a
datum table or preset table.
1 The TNC positions the touch probe at rapid traverse (value from
column FMAX) and with positioning logic (see “Running touch
probe cycles” on page 21) to the center of the first hole
1 .
2 Then the probe moves to the entered measuring height and
probes four points to find the first hole center.
3 The touch probe returns to the clearance height and then to the
position entered as center of the second hole
2 .
4 The TNC moves the touch probe to the entered measuring height
and probes four points to find the second hole center.
5 The TNC repeats steps 3 and 4 for the holes 3 and 4 .
6 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). The TNC calculates the datum as the intersection of
the lines connecting the centers of holes
1 / 3 and 2 / 4 and saves
the actual values in the Q parameters listed below.
7 If desired, the TNC subsequently measures the datum in the touch
probe axis in a separate probing.
X
Y
1 2
3 4
Parameter number Meaning
Q151 Actual value of intersection point in
reference axis
Q152 Actual value of intersection point in
minor axis
Before programming, note the following
Before a cycle definition you must have programmed a
tool call to define the touch probe axis.