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A Study on Estimating Measurement Error in the Measurement of Earing of Pilfer-Proof Caps

Summary: [This abstract is based on the author's abstract.]A case study was conducted in an Indian aluminum fabricating facility that produces pilfer-proof caps. An important characteristic of the product is earing, which is the difference between the hills and valleys on the cup ring after deep drawing of a circular blank. Management wanted to implement statistical process control because of a discrepancy in test results for earing in their laboratory and in the customer's laboratory, but there was concern about error in the measurement system that could affect the SPC effort. The study was initiated to determine the degree of measurement error by using five-stage nested analysis of variance to estimate error due to repeatability and reproducibility. The estimate of error was compared to the international standard, and it was recommended that this error be included in test results given to the customer. As a result of this action, the discrepancy problem of test results was substantially reduced.

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  • Topics: Design of Experiments, Process Management
  • Keywords: Analysis of variance (ANOVA),Case study,Repeatability and reproducibility studies (R&R),Measurement error,Nested experiments,Manufacturing process
  • Author: Das, Nandini
  • Journal: Quality Engineering