Hocken, R.; Borchardt, B.

NBS Internal Report 79-1752; 22p. June 1979.

Keywords:
Ball plate; grid plate; machine geometry; measuring machine; 3D metrology; redundancy.

Abstract:
We present a simple method for removing axis nonorthogonality and checking for length dependent scale errors in two-dimensional measurements. Use of this method requires that a two-dimensional master gage (ball or grid plate, for example) be measured in two positions which differ by a rotation of the plate 90° with respect to the measuring machine axis. The method is similar to that proposed by Reeve, but requires only linear least squares fitting on a small computer.

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