HEIDENHAIN ND 1300 OED and Crosshair Systems User Manual

Page 79

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. 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 num-

ber of points as they are entered. Some users prefer forward annotation because it establishes a uniform

number 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 in the Measure setup

screen. Please refer to Chapter 10: Setup for more information regarding backward

and forward annotation.

Probing with crosshairs and optical edge detection

Please refer to Chapter 5: Probes for details regarding probing features with crosshairs and optical edge

detection. Images used as examples in this chapter show crosshairs. However, the measuring concepts

apply equally well to crosshair and optical edge detection probes.

Optical edge detection provides additional flexibility in terms of acquiring points reliably on feature edges.

Please refer to Chapter 5: Probes for more details regarding optical edge detection.

Probing and Measuring Features