In the processing and inspection of large and medium-sized volume tank manufacturing plants, a large number of circular arc templates are used. Figure 1 is a diagram of the head inspection sample of a certain volume tank product. The central angle of the arc portion of such a model is less than 180°, and the chord length is generally much smaller than the diameter of the arc. The size of the sample itself is large, and it is difficult to use machine tool processing. Generally, it is artificially produced, with low processing precision and large shape error. Products tested with it generally have lower accuracy requirements and a larger tolerance range.
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