This paper proposes a simple evaluation method for form deviations of complex planer curve contours based on the coordinate measurement data. In this method, the contour curve is expressed as its optimal interpolation circular arcs and the form deviation is defined as the distance between the measuring points and the arcs. The geometrical form deviation of the profile is evaluated with the least squares criterion. It has been proved that the accuracy of the evaluation value for the form deviation can be restricted in a value specified arbitrarily. The method is easy and convenient for the engineering application. An actual evaluation example for a planar cam profile is shown in this paper, too.
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