HEIDENHAIN TNC 426B (280 472) Touch Probe Cycles - Manual (Page 146)

134 5 Digitizing
5.3 T
y
pes of Digitizing
Starting position
n Positive or negative range limit of the programmed line direction
(depending on the digitizing direction).
n MIN point coordinates from Cycle 5 RANGE or Cycle 15 RANGE in
the working plane, probe axis coordinate = clearance height.
n Automatically move to the starting position: First in the probe axis to
clearance height, then in the working plane.
Contour approach
The touch probe moves in the negative probe axis direction toward the
model. When it makes contact, the TNC stores the position
coordinates.
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 of the working plane parallel
to which the touch probe scans the model. Defining the direction at
the same time determines whether the subsequent machining
operation is performed by up-cut or climb milling.
U U U U Scanning direction (M): Traversing direction of the touch probe
referenced to the line direction. By combining line direction and
scanning angle you can set the digitizing direction as desired. Input
range: -90° to +90°
U U U U Height for feed rate reduction (M, S): Probe axis coordinate at
which the touch probe feed rate is reduced from rapid traverse to
the probing feed rate at the beginning of each line. Input range:
-99 999.9999 to +99 999.9999
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 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 Line spacing (M, S): The offset by which the probe moves in the
probe axis at the end of each line = line spacing. Input range: 0 to
+20 mm (M), 0 to +5 mm (S)
Before the LINE cycle, the part program must have a range
defined in the RANGE cycle.
Example: NC blocks for triggering touch probes
60 TCH PROBE 8.0 LINE
61 TCH PROBE 8.1 DIRECTN: X HEIGHT: +25
62 TCH PROBE 8.2 TRAVEL: 0.5 L.SPAC.: 0.2
PP.INT: 0.5
Example: NC blocks for measuring touch probes
60 TCH PROBE 18.0 LINE
61 TCH PROBE 18.1 DIRECTN: X ANGLE: 0
HEIGHT: +25
62 TCH PROBE 18.2 F1000 FMIN500
MIN.L.SPAC: 0.2 L.SPAC: 0.5
PP.INT: 0.5 TOL: 0.1 DIST: 2