Video Inspection Software User’s Guide
Cones Require the first three evenly distributed around one Z elevation and the second three evenly distributed around a second Z elevation. Any number of points can be probed anywhere on the cylinder after the first six points have been probed. Axis (3D Line) features An Axis (3D Line) feature should not be probed, but if it must, a 0-radius probe like a crosshair, or scribe can be used. If a touch probe is used instead, it is not compensated. The best way to measure this type feature is by construction. Datum Point Features Require a minimum of one point. When more than one point is probed, a least squares fit is applied to the data cloud. Skew Features Require a minimum of two points. The skew feature is of fundamental importance to the creation of a reference frame; therefore, many points should be probed along the skew line to ensure skew accuracy. The EyeMeasure probe or MeasureLogic probe is recommended for this measurement. When more than two points are probed, a least squares fit is applied to the data cloud. Using Video Probes Five video probe types are available for creating reference skews and datums and for measuring regular geometric features including points, lines, circles, arcs, slots, rectangles, blobs, distances, angles and planes. The five video probe types include: • Standard crosshair • Simple Active crosshair • Vtouch • MeasureLogic • EyeMeasure Automatic point entry can be enabled for the standard and active crosshairs. Automatic point entry is discussed in detail later in this section. Video Probe Scanning When a video probe is fired one or more orthogonal scan lines cross the selected part edge bounded by light and dark areas of the screen image. Optimum scanning direction and color sensitivity for contrast recognition are set by the system for the active crosshair, Vtouch, and MeasureLogic probes. Optimum scanning direction and color sensitivity are also set by default for the EyeMeasure and Simple Active crosshair probes but can be changed if required. This topic is discussed in detail in the description of the EyeMeasure and Simple Active crosshair probes later in this section. Standard Crosshair Probe
The standard crosshair consists of two lines crossed at 90 degrees. Single points are acquired manually or automatically (in CNC enabled systems) by positioning the crosshair
intersection over a feature. To use the standard crosshair probe: 1 Select the standard crosshair probe from the Probe menu
Measure toolbar > Probe menu > Standard crosshair probe
2 Position the crosshair probe over the part 3 Press the Enter button or press in the yellow measure prompt to fire the probe. A single point will be probed.
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