HEIDENHAIN ND 1400 - Manual (Page 63)

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Measuring
Backward/forward annotation
Forward annotation is used to specify a required number of probed points for each feature type. Backward
annotation allows the user to probe any number of points beyond the minimum requirement for any feature
type except slots and rectangles.
When using forward annotation, the number of remaining required points is shown at the top left of the
screen. As points are probed this number counts down. Backward annotation simply displays the number
of points as they are entered. Some users prefer forward annotation because it establishes a uniform num-
ber of points for feature measurements. For example, forward annotation can be set to require 4 points
when measuring a circle instead of the minimum three.
When forward annotation is used, the system automatically displays the feature after the last required point
is entered. It is not necessary to press the Finish key to conclude forward annotation measurements.
NOTE
Users can toggle between backward and forward annotation and specify the required
points for forward annotation in the Measure setup screen. Please refer to Chapter
10: Setup for more information regarding backward and forward annotation.
Measuring Features