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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So, to answer this we have to answe “what is a machine?”
A machine is an object with multiple moving pieces that give you an advantage in a task. That advantage could be increased strength, speed, precision, or the ability to do the task over and over again for a fraction of the effort.
As an example, a hammer.
A hammer that you can hold in your hand is not a machine. It is limited in the amount of force it can apply by your strength and technique.
But if we take the idea of a hammer, and make a machine out of a much larger hammer head on a pivoting arm, with a counterweight on the far end of the arm so the hammer moved freely around the pivot, we have created a machine that can hit much harder with much less effort, and with some practice this can also deliver that harder hit with greater precision, since the mechanical arm moves in fewer directions than your human arm.
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