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Dr. Joan Burtner

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Ch. 26: Measurement System Analysis Dr. Joan Burtner Certified Quality Engineer Associate Professor of Industrial Engineering and Industrial Management – PowerPoint PPT presentation

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Title: Dr. Joan Burtner


1
The Certified Quality Engineer Handbook 3rd ed.
Ch. 26 Measurement System Analysis
  • Dr. Joan Burtner
  • Certified Quality Engineer
  • Associate Professor of
  • Industrial Engineering and Industrial Management

2
Ch. 26 Measurement System Analysis
  • Terms and Definitions
  • Gage Repeatability and Reproducibility
  • Variables vs. Attributes
  • Gage RR Methods
  • Tabular
  • Analysis of Variance
  • Control Charts

2
3
Terms and Definitions 1 (Glossary page 630)
  • Gage Repeatability and Reproducibility (GRR)
    measures the capability of a gage to determine if
    it is suitable for use in its intended
    application.
  • Repeatability represents the gage variability
    when it is used to measure the same unit with the
    same setup or operator.
  • Reproducibility refers to the variability arising
    from different setups or operators.

3
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Terms and Definitions 2 (Glossary page 638)
  • Repeatability how close the measurements of an
    instrument are to each other if such measurements
    are repeated on a part under the same measuring
    conditions. (Glossary)
  • Reproducibility a measure of the degree of
    agreement between two single test results made on
    the same object in two different, randomly
    selected measuring locations or laboratories.
    (Glossary)

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Terms and Definitions - 3
  • Accuracy the difference between the measurement
    taken and the actual value of the variable
  • Accuracy a qualitative term that describes the
    closeness of alignment between an observed value
    and an accepted reference value
  • Bias a quantitative term representing the
    systematic difference between measurements
    obtained and the true quantity of interest

5
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Terms and Definitions - 4
  • AIAG Automotive Industry Action Group
  • Linearity measures how changes in the size of
    the part being measured will affect measurement
    system bias over the expected process range
    Example Does bias change significantly as part
    size increases?
  • Stability a measure of how the measurement
    system performs over time.
  • Precision the variation encountered when the
    same part is measured repeatedly using the same
    measurement system (under the same conditions)
    page 258

6
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