MINIMUM ZONE EVALUATION OF CIRCLES AND CYLINDERS

A strategy for minimum zone evaluation of circles and cylinders is pro posed in this work. This strategy employs a non-linear transformation to convert a circle into a line and a cylinder into a plane. A straigh tness or a flatness evaluation scheme was then employed to obtain appr opriate control points and minimum zone deviation for the feature conc erned. A series of inverse transformation procedures was then implemen ted to compute desired feature parameters. Computer simulation results revealed that the proposed minimum zone method can yield a smaller to lerance value than the least-squares method. Also, the sensitivity of the proposed method and the least-squares method to an abrupt peak in the measurement data was addressed.