HEIDENHAIN ND 1300 VED and Crosshair Systems - Manual (Page 90)

70 QC-300 Series User’s Guide
Recovering from data errors
Data errors are rare when the part, stage and optical system are clean and well maintained, and the lighting,
contrast and brightness are properly adjusted. In addition, the QC-300 is extremely forgiving of typical
cleanliness and lighting issues. However, it is possible that an occasional data error will occur while the
Multiple edge probe is attempting to collect data from feature locations calculated from the seed points and
the specified number of total data points.
When a data error occurs, the system switches from automatic probing using the multiple edge probe to
manual probing using the single edge probe, and prompts the operator to either complete the measurement
with the available points, or to probe the remaining points manually. When the operator elects to continue
probing, he or she is guided to the required points by the green arrow. In either case the operator must press
the Finish key to complete the measurement.
While it is not expected that measurements would be conducted on a dirty stage like the one shown in this
example of a circle measurement, this dirty stage was used to produce a data error and illustrate the error
recovery process.
When the seed points are probed the red target circle is dis-
played and the stage is positioned to place the green arrow
in the target circle. The system begins to probe the remain-
ing points automatically, however, the stage is dirty and
makes the feature edge indistinct producing a data error.
The operator is then asked to complete the measurement
using the existing points or probe the remaining points
manually using the single edge probe.
The Multiple edge probe seeds three points and user is prompted to move the green arrow into the red circle