A Comparison of Selected Algorithms of Form Deviation Calculation

Abstract

The article concerns the verification of accuracy of selected algorithms of form deviation evaluation. The paper presents the results of experimental investigations concerning coordinate measurements of products composed of free-form surfaces, which are characterized by various degrees of geometric complexity. The experimental investigations were conducted with the use of the method of form deviation estimation which is based on the Lagrange interpolation of measured points and two additional algorithms available in the Calypso software, which cooperates with a coordinate measuring machine. Moreover, the experimental research was performed by using of the coordinate measuring machine ACCURA II equipped with the scanning probe VAST XT. Based on the analysis of gained results of coordinate measurements the method of form deviation calculation which uses the Lagrange interpolation of measured points in order to calculate an actual curve achieved better results than one of the analysed algorithms of the Calypso inspection software.

Keywords

• coordinate measuring technique
• form deviation
• free-form surface
• interpolation