HEIDENHAIN TNC 426B (280 472) Touch Probe Cycles - Manual (Page 58)

46 3 Touch Probe Cycles for Automatic Workpiece Inspection
3.2 A
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DATUM FROM OUTSIDE OF RECTANGLE
(touch probe cycle 411, ISO: G411)
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.
1 The TNC positions the touch probe to the starting points at rapid
traverse (value from MP6150 or MP6361) following the positioning
logic (see “Running touch probe cycles” on page 7) to the starting
point
1 . The TNC calculates the probe starting points from the data
in the cycle and the safety clearance from MP6140.
2 Then the touch probe moves to the entered measuring height and
probes the first touch point at the probing feed rate (MP6120 or
MP6360).
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
sets the datum at the measured center, or enters its coordinates
in the active datum table.
Before programming, note the following:
To prevent a collision between the touch probe and
workpiece, enter high estimates for the lengths of the 1st
and 2nd sides.
Before a cycle definition you must have programmed a
tool call to define the touch probe axis.
4
1 3
2