Conduct a Gage R&R Study to evaluate your measurement system.
When you measure, three factors come into play: Part variation, Appraiser variation and Equipment variation.
You want most of the variation to be between the parts, and less than 10% of the variation to be caused by the appraisers and equipment.
For more info see http://qimacros.com/free-lean-six-sigma-tips/aiag-msa-gage-r&r.html
Download 30 day trial at http://www.qimacros.com/freetrial.html
This video shows you how to perform a Gage R&R study using the QI Macros for Excel
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