As mentioned above, in general, a double cylinder should be preferred instead of a V-shaped frame, and the structural form of the positioning cylinder is as shown in FIG. There are four main structural forms of the positioning cylinder: Fig. 19a is a basic form, and the combination of the two positioning cylinders of this form is equivalent to a short V-shaped frame, which can limit the two degrees of freedom of the workpiece. Figure 19b shows a long positioning cylinder. The combination of two long positioning cylinders is equivalent to a V-shaped frame, which limits the four degrees of freedom of the workpiece. Figure 19c is a short cylinder with axially positioned steps. The two combined functions are equivalent to a short V.
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