HEIDENHAIN TNC 426B (280 472) Touch Probe Cycles - Manual (Page 72)

60 3 Touch Probe Cycles for Automatic Workpiece Inspection
3.2 A
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DATUM IN TOUCH PROBE AXIS (touch probe
cycle 417, ISO: G417)
Touch probe cycle 417 measures any coordinate in the touch probe
axis and defines it as datum. If desired, the TNC can also enter the
measured coordinate 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
programmed starting point
1 . The TNC offsets the touch probe by
the safety clearance in the positive direction of the touch probe
axis.
2 Then the touch probe moves in its own axis to the coordinate
entered as starting point
1 and measures the actual position with
a simple probing movement.
3 Finally the TNC returns the touch probe to the clearance height and
sets the datum in the touch probe axis, or enters its coordinates in
the active datum table.
U U U U First measuring point in the 1st axis Q263
(absolute): coordinate of the first touch point in the
reference axis of the working plane.
U U U U First measuring point in the 2nd axis Q264
(absolute): coordinate of the first touch point in the
minor axis of the working plane.
U U U U First measuring point in the 3rd axis Q294
(absolute): coordinate of the first touch point in the
touch probe axis.
U U U U Setup clearance Q320 (incremental): additional
distance between measuring point and ball tip. Q320
is added to MP6140.
U U U U Clearance height Q260 (absolute): coordinate in the
touch probe axis at which no collision between tool
and workpiece (fixtures) can occur.
U U U U Datum number in table Q305: Enter the datum
number in the table in which the TNC is to save the
coordinate. If you enter Q305=0, the TNC
automatically sets the display so that the new datum
is on the probed surface.
U U U U New datum for touch probe axis Q333 (absolute):
coordinate in the touch probe axis at which the TNC
should set the datum. Basic setting = 0
Example: NC blocks
5 TCH PROBE 417 DATUM IN TS AXIS
Q263=+25 ;1ST POINT 1ST AXIS
Q264=+25 ;1ST POINT 2ND AXIS
Q294=+25 ;1ST POINT 3RD AXIS
Q320=0 ;SET-UP CLEARANCE
Q260=+50 ;CLEARANCE HEIGHT
Q305=0 ;NO. IN TABLE
Q333=+0 ;DATUM
1
X
Z
Q260
Q294
MP6140
+
Q320
1
Before programming, note the following:
Before a cycle definition you must have programmed a
tool call to define the touch probe axis. The TNC then sets
the datum in this axis.