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 begin at one end of the arc and finish at the other, with intermediate points evenly distributed along the arc. Arcs greater than 180 degrees can also be interpreted as circles by the M2 software. To change a feature between an arc and a circle: • Select the feature in the Part View • Press the Change Feature Type button in the Measure toolbar. 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. Additional points can then be probed to increase measurement accuracy. 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 more than the required minimum number of points should be probed along the skew line to ensure skew accuracy. When more than two points are probed, a least squares fit is applied to the data cloud.
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