Video Inspection Software User’s Guide
Probing and Measuring Features Part features are measured by probing and collecting points that define the feature shape and location. Features can be measured explicitly using any probe or automatically using the MeasureLogic or EyeMeasure probes. Explicit feature measurements are always performed by pressing the desired Feature Measure button and then probing at least the minimum required number of points on the feature’s edge. Features measured with the MeasureLogic probe can be measured explicitly as above, or by allowing the system to determine the feature type automatically based on the data cloud of points collected. Features can be probed manually or automatically as part of a part program using video edge detection or touch probes in CNC enabled systems. Probed features are shown in the Part View and entered into the Feature List. As mentioned earlier, the measurement of blobs is a special case requiring explicit measurements using a special tool.
The following feature measurements are supported by the M3 system: • Points ● Distances ● Spheres • Lines ● Angles ● Cylinders • Circles and arcs ● Planes ● Cones • Slots and rectangles ● Blobs • Patterns (teaching patterns for recognition in program playback) NOTE
Pattern recognition is only supported in CNC systems or in manual systems that also have the Digital Comparator option enabled.
Occasionally the system can misinterpret probed data points, particularly when there is not an even distribution of points collected along the entire feature edge. This can lead to feature identification errors. The Change Feature Type button can be used to change the type of a feature selected in the Feature List or Part View when identification errors occur. For example, a circle feature can be changed to an arc. The Change Feature button is not shown in the Measure toolbar when there are no alternative feature types for the selected feature. Detailed feature information including coefficients, geometric form, fit type and the data cloud of points probed is always available in the Feature Detail screen discussed in Section 6: Feature List, Feature Detail and Part View Functions. A graphic drawing of the feature and the data cloud of points probed is also available in the Feature Detail screen. Tolerances can always be applied to measured features and are discussed in Section 8: Tolerancing. Single Point Probing Single point probing is performed using the video crosshairs or touch probes. Features are measured by probing one point at a time as the user aligns the probe on the feature edge until at least a minimum number of required points have been probed. The number of points required for single point probing is discussed in detail in Points Required for Single Point Probing contained in Section 3: Probes. Feature measurements become more accurate as the number of points probed increases beyond the minimum number required. Multipoint Probing Multipoint probing is performed using the MeasureLogic or EyeMeasure probe. Features are measured by touching a feature edge with the MeasureLogic probe or by pressing and dragging along the edge with the EyeMeasure probe. In either case, many points will be evenly distributed on the feature edge and collected automatically by the probe. Multipoint probes are discussed in detail in Section 3: Probes.
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