Abstract
The paper deals with the influence of interactions between parts and appraisers on the results of the analysis of repeatability and reproducibility of the measurement system. The appropriate interactions have been created by simulated changes of selected values measured within the framework of real gauge repeatability and reproducibility study and evaluation was performed using average and range method and analysis of variance (ANOVA). Effects of changes type and size on the results of the analysis (%EV – repeatability; %AV – reproducibility; %INT – interaction between operators and parts; %GRR – gauge repeatability and reproducibility; ndc – number of distinct categories) are compared and mechanisms of these effects are analysed.
Highlights
The success of companies at the market has for several decades depended on the quality of the provided products and services
The results of the simulations show that the analysis of variance (ANOVA) method is more suitable for analysis of repeatability and reproducibility of the measurement system
Its main advantage is the ability to detect eventual interactions between parts and appraisers, which may significantly worsen the variability of the used measurement system
Summary
The success of companies at the market has for several decades depended on the quality of the provided products and services. This quality cannot be achieved without functioning quality management system, whose main task is to plan, manage and continuously improve all the processes within the organization. All decision-making within the scope of this "trilogy of quality" should be done on the basis of collected data or facts. In the case of manufacturing processes, these facts represent the measured data of all the monitored quality parameters. An important condition for making the right decision is, in this case, a sufficient amount of quality data, provided thanks to a quality measurement system only. ISO/TS 16949 standard, which includes the requirements for quality management system in the automotive industry, says, in Clause 7.6.1, that statistical studies must be performed in order to analyse the variability of all types of measurement and test systems
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