Section 4: Measuring, Constructing and Creating Features Measurements can be performed on manual and CNC enabled systems using the simple crosshair, the manual optical edge probe or the auto optical edge probe. Explicit feature measurements are always performed by pressing the desired Measure Feature button and then probing at least a minimum number of required points on the feature’s edge. Edge Logic can be used to reduce measurement time by enabling gesture driven control of start and stop measure commands and by automatically determining and entering the feature type for lines, circles, arcs and distances. When Edge Logic is used in CNC enabled systems in conjunction with Auto Finish, a user specified number of points will be probed automatically based on a few explicitly probed seed points. Edge Logic is explained in Section 3: Probes. The use of Edge Logic in CNC enabled systems is explained later in this section. Auto Point Entry can be used with the simple crosshair probe in the interactive mode and in the program playback mode for non-CNC systems to reduce measurement time. When the Auto Point Entry function is enabled, a point is collected by the system automatically after a short delay each time the stage is moved to a new feature position. Auto Point Entry is explained in Section 3: Probes. Feature constructions are performed by pressing the desired Measure Feature button and then selecting the parent features from the Feature List or from the Part View that will be used for the construction. When the feature construction is complete the resulting construction will be added to the Feature List and Part View. Features are created by pressing the desired Measure Feature button, pressing the associated Create Feature button and entering the desired feature parameter data into the fields provided.
Measurement activities can include: • Measuring features by probing • Constructing features •
Creating new features based on data provided by the user
Users can perform quick checks of individual part features without establishing a reference frame or can establish a reference frame including a part skew and zero datum in preparation for formal measurements that will be compared
to part drawings and be recorded as a part program. Preparing for Measurement Activities To prepare for measurements: • Verify that the part and stage are clean • Confirm that the part lighting is adequate • Select the desired magnification • Optimize the part focus • Select the desired feature measurement type • Select the desired probe • Perform an optical edge teach calibration if necessary (explained in Section 3: Probes)
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