HEIDENHAIN TNC 320 (340 55x-03) Touch Probe Cycles - Manual (Page 68)

68
3.2 Pr
eset
ting aut
o
matically
DATUM RIDGE CENTER (touch probe cycle 409,
DIN/ISO: G409)
Touch probe cycle 409 finds the center of a ridge 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 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
probes the first touch point at the probing feed rate (column F).
3 Then the touch probe moves at clearance height to the next touch
point
2 and probes the second touch point.
4 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
5 If desired, the TNC subsequently measures the datum in the touch
probe axis in a separate probing.
X
Y
1
2
Parameter number Meaning
Q166 Actual value of measured ridge width
Q157 Actual value of the centerline
Before programming, note the following
To prevent a collision between touch probe and
workpiece, enter a high estimate for the ridge width.
Before a cycle definition you must have programmed a
tool call to define the touch probe axis.