The three-column measurer described in this article can be used to measure the concave and convex arc of a workpiece or a template, as shown in Figure 1. 1. Structure and manufacturing requirements of the three-column measuring device As shown in Fig. 1, the cylinders 2, 3, and 4 have the same radius, and can be made into several different specifications according to the numerical value to measure arcs of different radii. The cylinder should be guaranteed to have high dimensional accuracy, shape accuracy and good surface quality, as well as high hardness and wear resistance. Cylinder 2 and
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