Maybe consider the question from another angle: how could we possibly have made all of the precision tools we have today if we couldn’t master something as simple as curved metal plates, interlocking metal rings, and decorations? Consider that modern machinists measure by the 0.001″ (or micron, for you clever European folks).
It’s like any other core resource related trade: we do it for a really, really long time and we get good at it, and then we learn how to do it even better and raise the bar. On and on it goes until we get from horseshoes to machining hydraulic shafts that are within +/-0.005″ in diameter over the entire length of a multi-foot shaft.
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