HEIDENHAIN TNC 426B (280 472) Touch Probe Cycles - Manual (Page 142)

130 5 Digitizing
5.3 T
y
pes of Digitizing
Digitizing parameters
The parameters marked with an (M) apply to measuring touch probes,
those marked with an (S) apply to triggering touch probes:
U U U U Line direction (M, S): Coordinate axis in whose positive direction
the touch probe moves from the first contour point.
U U U U Limit in normal lines direction (S): Distance by which the touch
probe lifts off the model after each deflection of the stylus during
scanning. Input range: 0 to 5 mm. Recommended input value: Enter
an input value between 50% and 100% of the probe point interval.
The smaller the ball-tip radius, the larger the Limit in Normal lines
direction should be programmed.
U U U U Scanning direction (M): Traversing direction of the touch probe
referenced to the line direction. Input range: –90° to +90°
U U U U Feed rate F (M): Enter the digitizing speed. Input range: 1 to 3 000
mm/min. Note that the higher the digitizing speed, the less accurate
the resulting data will be.
U U U U MIN. feed rate (M): Probe feed rate for the first line. Input range: 1
to 3000 mm/min
U U U U Min. line spacing (M): If you enter an input value that is smaller
than the programmed line spacing, the TNC decreases the spacing
between the scanned lines to the programmed minimum for
digitizing flat sections of a contour. This ensures that the density of
digitized positions remains constant even if complex surface
structures are scanned. Input range: 0 to 20 mm (M), 0 to 5 mm (S)
U U U U Line spacing (M, S): The offset by which the probe moves in the
probe axis at the end of each line before scanning the next line.
Input range: 0 to 20 mm (M), 0 to 5 mm (S)
U U U U Max. probe point interval (M, S): Maximum spacing between
consecutive digitized positions. The TNC also accounts for
important points that define the contour of the model, for example
at inside corners. Input range: 0.02 to 20 mm (M), 0.02 to 5 mm (S)
U U U U Tolerance (M): The TNC stores only those digitized positions whose
distance from a straight line defined by the last two probe points
exceeds the programmed tolerance. This ensures a high density of
digitized positions for contours with sharply curved surfaces, and as
low a density as possible for contours with flat surfaces. An input
value of zero means that the digitized positions are output in the
programmed probe point interval. Input range: 0 to 0.9999 mm
U U U U Feed rate reduction at edges (M): Answer the dialog question
with NO ENT. The TNC enters a value automatically.
Example: NC blocks for triggering touch probes
60 TCH PROBE 6.0 MEANDER
61 TCH PROBE 6.1 DIRECTN: X
62 TCH PROBE 6.2 TRAVEL: 0.5 L.SPAC: 0.2
PP.INT: 0.5
Example: NC blocks for measuring touch probes
60 TCH PROBE 16.0 MEANDER
61 TCH PROBE 16.1 DIRECTN: X
ANGLE: +0
62 TCH PROBE 16.2 F1000 FMIN500
MIN.L.SPAC: 0.2 L.SPAC: 0.5
PP.INT: 0.5 TOL: 0.1 DIST: 2
The feed rate reduction is effective only if the number of
points at which the feed rate must be reduced does not
exceed 1000 points in a digitizing line.