HEIDENHAIN TNC 410 - Manual (Page 275)

13 Digitizing 262
13.3 Meander Digitizing
Digitizing cycle 6 MEANDER
The MEANDER cycle scans and digitizes a 3-D surface in a back-and-
forth series of parallel lines. This method is best suited for digitizing
relatively flat surfaces. If you want to use the SUSA evaluation
software to further process the data, you must use the MEANDER
cycle.
Before starting the digitizing process, select an axis in the working
plane. During digitizing, the touch probe moves in the positive
direction of the selected axis, starting at the MIN point of the
working plane. When it reaches the range limit, it moves by the line
spacing in the positive direction of the other axis and then travels
back along this line. At the other end of this line, the touch probe
moves once again by the line spacing. This process is repeated
until the entire range has been scanned.
Once the entire range has been scanned, the touch probe returns
to the clearance height.
Starting position
■ MIN point coordinates from Cycle 5 RANGE in the working plane,
spindle axis coordinate = clearance height.
■ 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.
Before the MEANDER cycle, the part program must have
a range defined in the RANGE cycle.
Digitizing parameters
ú Line direction: Coordinate axis in whose positive direction the
touch probe moves from the first contour point.
ú Limit in normal lines direction: 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.
ú Line spacing: 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 5 mm
ú Max. probe point interval: 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 5 mm
X
Z
Y
13.3 Meander Digitizing
Example NC blocks
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