The impact of measurement systems performance on process capability evaluation

Abstract

[EN] The evaluation of quality of products and processes depends on the ability to obtain accurate measurements consistently over time. With these measurements different control tools are used to monitor the performance of processes and the conformity of products. One of these tools, widely used and each time more recognized as relevant, is Capability analysis. Through a set of wellknown parameters, as Cp and Cpk, capability is a key element in quality control with a continuous improvement approach. As capability indexes are computed using data coming from measurement processes, the consistency of capability indexes depends highly in the quality and reliability of the measurements obtained from such processes. In this paper we analyze the relation between the performance of the measurement systems and the representativity of the capability studies.