Apr 16 2021
Measuring QC Efficacy: A Proposal
[The featured image is of a Vietnamese satellite undergoing final test in Japan]
As Jay Bitsack pointed out in his comments on LinkedIn about my previous post, the portability of a method from epidemiology to manufacturing quality is not a foregone conclusion. Formally, the logic of validating a vaccine seems applicable to the solution of a quality problem. They look similar when you consider only outcomes in terms of infection rates or the proportion of defectives.
There are differences between data sets from a clinical trial and tests run before and after a process change in production that may affect the applicability of a method. We examine the conditions for the approach developed by Carlo Graziani for vaccine efficacy to cross over to quality control. Then we work out the math of Graziani’s method and the means to apply it.
Feb 23 2022
Standards, China, and the Industrial Revolution
[Featured image: a Han dynasty bronze ruler]
As a general principle, in manufacturing, you need to do the work the same way every time if you want the output to be consistent. In some cases, like extracting metals from ores, you need to tweak processes to produce consistent output from raw materials of varying compositions. Then the tweaks themselves must be executed consistently so that the response to a particular variation in ore content is always the same.
Standards are an area where China had a 2,000-year headstart but neither the scientific nor the industrial revolutions occurred there.
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By Michel Baudin • Technology • 1 • Tags: interchangeable parts, Part standardization, Quality, Standards