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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Nothing is perfectly flat/plumb/level – that’s an important piece of it. They’re just as flat/plumb/level as we need them to be for our purposes. So as tools got better, craftsmen got better at both making things with tighter tolerances and measuring those tolerances. Both of those things tend to go hand in hand – as our ability to make things with more precision increases we need increasingly sensitive tools to let us know how precise we’ve made them.
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