The sales promotion literature for numerically controlled machine A notes a "positioning accuracy" of 0.0004 in. Another catalog for different manufacturer's similar NC machine, B, notes a "positioning accuracy" of 0.0006 in. Based on these figures it might easily be assumed that machine A is more accurate than machine B. Yet machine B could actually be more accurate than machine A. It all depends on the ground rules for how the accuracies are determined.
When we speak of the "accuracy" of a numerically controlled machine tool, it is important the term be clearly understood and that variations of the term be clearly defined.
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