Nov 29 2023
Tolerances
Online forums do not often discuss quality fundamentals like characteristics and tolerances. You find arguments about process capability, but the requirements for process capability are taken as given. Tolerances on characteristics are objectives that production is expected to meet, and deserve an exploration of what they mean and how they are set.
Jan 29 2024
Measurement Errors
Like spouses in murders, errors are always the prime suspect when measurements go awry. As soon Apollo 13 had a problem, a Mission Control engineer exclaimed, “It’s got to be the instrumentation!”
It wasn’t the instrumentation. In general, however, before searching for a root cause in your process, you want to rule out the instrumentation. For that, you need to make sure it always gives you accurate and precise data.
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By Michel Baudin • Data science • 2 • Tags: ANOVA, Gare R&R, Measured Variables, measurement, measurement error