A Study on Design of Artefact for Probe Type Co-Ordinate Measuring Machine Calibration

The Co-ordinate measuring machines (CMM’s) in industrial environments have become an important resource for the quality systems, monitoring manufacturing processes, reduction errors during manufacturing process, inspection of product specifications and in continuous quality improvement. Calibration means to identify the error behavior of measuring instruments and all planned applications. Parametric calibration, kinematic reference standard and artefact based method are types of calibrations which are used for CMM. Artefact is standard object from which measured results are compared with dimensions of the artefact to determine the errors in the machine. In this paper we present a study on optimal design of ball and plate type artefact used for calibration of probe type CMM. The study is more likely concern of size, shape & positioning of the balls on base plate.