Quote:
Originally Posted by yash101
I think that manual machines can get even a better precision than that. CNCs have their minimal unit as the step, of their stepper motors, unlike us! 
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Better CNCs(any of the ones that you would be able to get better than .001 precision on) use servos. From what I have heard, to get better than .001 you need to start accounting for temperature. A human cannot do this.