HOW GAUGE STUDIES GET IT WRONG

摘要

Within manufacturing, gauge studies are used to determine the variation and accuracy of measurements. Metrologists will often say that these studies are not as reliable as uncertainty evaluation, but what does that mean in practical terms? Manufacturing engineers often say that because a gauge study uses actual measurements of a calibrated reference it is 'the truth' while uncertainty evaluation is just theory. Such a view ignores the fact that gauge studies can fail to detect significant sources of uncertainty.