Some notes of interesting techniques, sites and people concerning this topic.
On YouTube there are some very interesting video clips on prototyping and machine metrology which are a must see by Dan Gelbart. He shares a measurement technique, which he refers to as reversal technique. In essence two unknown surfaces can be mapped, and compared if a common reference surface also of unknown dimension is used.
https://makezine.com/2015/03/20/18-lessons-smart-prototyping-self-made-billionaire/
https://makezine.com/2015/03/20/18-lessons-smart-prototyping-self-made-billionaire/
Airy and Bessel Points effects explained.
https://www.mitutoyo.co.jp/eng/pdf/E4329_QuickGuide.pdf
31/03/2018 - Recently I browsed through Stefan Gotteswinter web site, wealth of knowledge! Here he shared a link to 50 tidbits for precision work, #47 references Donaldson Reversal, still need to read up more on this, but I believe this is what Dan Gelbart refers to.
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