HEIDENHAIN TNC 620 (340 56x-02) Cycle programming - Manual (Page 324)

324 Touch Probe Cycles: Automatic Datum Setting
15.5 D
A
TUM FR
OM OUTSIDE OF RECT
A
NGLE (Cy
c
le 41
1, DIN/ISO: G41
1
)
15.5 DATUM FROM OUTSIDE OF
RECTANGLE (Cycle 411,
DIN/ISO: G411)
Cycle run
Touch Probe Cycle 411 finds the center of a rectangular stud and
defines its center 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 to the starting point 1 at rapid
traverse (value from FMAX column) following the positioning logic
(see “Executing touch probe cycles” on page 283). 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
probes the first touch point at the probing feed rate (column F).
3 Then the touch probe moves either paraxially at the measuring
height or linearly at the 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 312).
6 If desired, the TNC subsequently measures the datum in the touch
probe axis in a separate probing and saves the actual values in the
following Q parameters.
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
Q154 Actual value of length in the reference
axis
Q155 Actual value of length in the minor axis