How do you make a machine that has perfectly flat/plumb/level metal components without the aide of a machine to begin with?
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It’s not like we didn’t possess machining abilities before the industrial revolution. Simple tools like latest, stone grinders, chisels and hand planers have been used by craftsmen for hundreds/ thousands of years.
The difference is that industrial machines do the same work, but fast, and now more precise. The first industrial machines weren’t any more precise, just faster.
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