Shape and position errors have an important bearing on product quality. Shape and position errors include shape error and position error. Position error includes orientation error, positioning error and runout error. Different from the shape error is the problem that the position error has a reference. In the actual test, the reference is often confused with the measured elements, and they are understood as the mutual reference relationship, that is, the method of anti-reference measurement. We believe that this is not correct. In the detection of position error, in addition to the drawings specifically indicating optional benchmarks, the use of counter-reference measurements is generally an unreasonable test method.
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