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> Machine tools are not designed by extremely skilled machinists

But they're built by extremely skilled machinists. I've practiced engineering for decades but I wouldn't even want to be in the same room as any object I've personally made being spun up the first time.

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Not really. Mostly they are built by machines. Extremely skilled machinists work in research or niche development, where they can solve new problems. Very skilled operators can tram a machine better, or eke out more repeatable clamping, and make slightly more accuracy out of an established process.

Their time is much better spent creating new processes or making low-run jigs and things.

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