Machining accuracy includes three aspects: dimensional accuracy, shape accuracy and position accuracy.
1. Dimensional accuracy The degree to which the actual size of the part surface itself or between surfaces after machining is consistent with the ideal part size. The ideal part size is the median value of the dimension on the part.
2. The degree to which the actual shape of the surface of the part after machining is consistent with the ideal surface shape of the part. The ideal part surface shape is the absolutely accurate surface geometry.
3. Position accuracy The degree to which the actual position of each surface of the part matches the position between the surfaces of the ideal part after machining. The position between the surfaces of an ideal part is the absolutely exact position between the surfaces.
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