HEIDENHAIN ND 100 User Manual - Manual (Page 32)

32 1 Operation
1
.3 Pr
epar
ing t
o
Measur
e
Align the part to a measurement axis
Accurate measurements require the part to be perfectly aligned along
a measurement axis. Misaligned parts result in cosine measurement
errors. Use the skew function to convert machine coordinates to part
coordinates and compensate for part misalignment. Measure a skew
each time a new part is mounted on the measuring system.
Measure a skew line by probing a straight edge of the part on a major
measurement axis. A minimum of two points is required for a line, but
probing more points will improve accuracy.
Perform a part alignment (Skew)
 Press the Skew key.
 Probe a minimum of two points along the part edge.
In the example shown here, the part is aligned to the
X-axis by probing three points along the bottom edge
of the part.
Notice
The alignment is performed on a part edge here as an
example. Part alignments can be made on part features
other than an edge. For example, a line constructed
between the centers of two holes could be aligned to a
measurement axis if desired.
The skew alignment edge or line must be oriented within
45 degrees of the measurement axis.
Three points are probed to align the bottom edge of a
part to the X-axis
Notice
The part could alternately have been aligned along a
vertical edge to the Y-axis.