Dan Gelbart

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Master prototyper down to 1 micron. https://makezine.com/2015/03/20/18-lessons-smart-prototyping-self-made-billionaire/

  1. Smooth surfaces - [1]. Scraping and lapping. Hydrodynamic = zero friction, zero wear. Reversal method - with a dial indicator - to get straightness or flatness or runout of an object. Can separate roundness from runout. Reversal method is critical to precision and metrology.
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