HEIDENHAIN ND 1300 VED and Crosshair Systems - Manual (Page 107)

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Measuring
Probing specific feature types
While the probing process is essentially the same for all feature types, the minimum number of points
required and the geometric placement of these points are different. The unique requirements for probing
each feature type are described in the remainder of this section.
Probing points
A minimum of one probed point is required to measure a point.
Multiple points can be probed if the feature location is indistinct
and it is considered a benefit to use the geometric average of many
probed locations.
When a single point is probed, Measure Magic will correctly recog-
nize a point and assign the correct feature. However, when multiple
points are probed, it is possible that the wrong feature type will be
assigned. If the wrong feature type is assigned, it can easily be
changed by selecting the correct feature from a menu of alternatives in the DRO window.
Measurement results are shown in the Features list, View window and DRO window. Results are also
shown in the DRO overlay. The feature graphic in the View window shows the feature and the points used
to define it. Errors are shown as whiskers connecting the probed points to the feature. The maximum errors
are shown in red and are used in the calculation of form. The DRO window shows the number of points
used, the form and the coordinate location of the feature. When only one point is probed, the form error
is zero. When more than one point is probed, the form error is the sum of the two greatest opposing error
magnitudes.
A single point is probed to measure
a point
Touch the feature type... to display the menu of alternative
types
Probed points are shown in the
View window
Probing and Measuring Features