HEIDENHAIN TNC 426B (280 472) Touch Probe Cycles - Manual (Page 141)

HEIDENHAIN TNC 426, TNC 430 129
5.3 T
y
pes of Digitizing
5.3 Types of Digitizing
Meander digitizing
n
Triggering touch probe: Digitizing Cycle 6 MEANDER
n Measuring touch probe: Digitizing Cycle 16 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.
When you are digitizing with the measuring touch probe, the TNC
stores positions at which sharp changes in direction have occurred. Up
to 1000 positions per line can be stored. In the next line, the TNC
automatically reduces the probe feed rate in the vicinity of such
positions. This behavior improves the scanning results.
Starting position
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.
X
Z
Y
Before the MEANDER cycle, the part program must have
a range defined in the RANGE cycle.