Video Inspection Software User’s Guide
Points Required for Single Point Probing While multipoint probes collect many points each time they are fired, crosshairs and touch probes probe a single point at a time. The minimum number of points required for each feature type and recommendations regarding single point and multipoint probes are provided below. Points Require one or more points. When more than one point is probed, a least squares fit is applied to the data cloud. Lines Require two or more points. When more than two points are probed, the data fit type specified in the Feature Detail screen is applied to the feature’s data cloud. Points should be evenly distributed along the line. Circles and Arcs Require three or more points. When more than three points are probed, the data fit type specified in the Feature Detail screen is applied to the feature’s data cloud. Circle points should be evenly distributed around the circle. Arc points should begin at one end of the arc and finish at the other, with intermediate points evenly distributed along the arc. Slots and Rectangles Require five or more points. When more than five points are probed, the data fit type specified in the Feature Detail screen is applied to the feature’s data cloud. Single point and multipoint probes may be used. Blobs Blobs are defined as irregular shapes, often characterized by a complex perimeter. The point density necessary to accurately measure a blob is much higher than the point density of the probes available in the probe menu and therefore blob measurements utilize a special tool to acquire points around the perimeter. The measurement of blobs is discussed in detail in Section 4: Measuring, Constructing and Creating Features. Distances Require two points. Angles Require two or more points on each leg of the angle. Points are probed first on one leg and then on the other leg of the angle. Planes and Datum Planes Require three or more points. When more than three points are probed, the data fit type specified in the Feature Detail screen is applied to the feature’s data cloud. Probed points on a plane feature should be evenly distributed across the plane surface. Measurements of planes with greater than 15 degrees tilt are not permitted. Spheres Require a minimum of four points evenly distributed around the sphere. One good pattern is three near the diameter and one at the top. Cylinders 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.
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