2 Measurement System Analysis
Description
• Objective:
• Accuracy / Bias
• Linearity
• Stability
• Gage R&R
• Variable Gage R&R
• Four Criteria in Variable Gage R&R
• REPRODUCIBILITY
• REPEATABILITY
• Description:
• Measurement system analysis (MSA) uses scientific tools to determine the amount of total variation is from the measurement system. An objective method to assess the validity of a measurement system and minimize these factors that could excessively contribute to the variation in the data.
• Objective:
• Confirm that the measurement used to collect the data is valid. Goal is to quantify the equipment/process variation and appraiser variation and the total measurement system variation.
• The following areas components of measurement error needs to be studied and
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Ensuring the measurements taken by appraiser(s) for the process is stable and consistent over time.
• SPC Charts use a variety of tests to determine stability. Many software programs will have these as options to include when analyzing data and will even indicate the point(s) and test that each failed.
• Some of the corrective measures once again include Standard Operating Procedures. Each appraiser should measure the same way every time over a long period of time and each appraiser should measure the same way as all the others. Recall that special causes can also occur with the process control limits and these must be given corrective action before proceeding to validate the measurement system.
• ________________________________________
• Gage R&R
• Variable Gage R&R
• In a variable Gage R&R there are generally two to three operators appraisers with 5-10 process outputs measured by each appraiser. Each process output is measured 2-3 times by each operator.Depending on the cost and time involved you can add more appraisers and measurements and
Reliable-Measuring what is actually intended to measure; not easy to manipulate; as objective and quantifiable as
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