Think about the last time you used a smartphone, started a car, or relied on a medical implant. None of those things work because someone eyeballed the dimensions. Every component inside them was cut, ground, turned, or formed to measurements that are often smaller than a human hair (and in some cases, smaller than a bacterium). The machinery that enables this kind of accuracy operates in facilities where vibration isolation, ambient temperature control, and micron-level instrument calibration are not perks but requirements. It is not glamorous work, but it is some of the most consequential manufacturing done today.…
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