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I was a machinists for 16 years. The answer is simple. Do it the same way all the time. You parts will then be consistent. I try to cut in the middle of the line so I always have some trace of where the edge is. You can always take if off t you need too.When dealing in 10th's (.0001) I always rounded up. You can always take if off but you can't put it back on.
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