Well, it is sticking straight out, but sticking straight out in a slightly different way from what happens with a sphere. See, the sides of a cylinder are vertical.
它垂直于其表面指向外面,但这与球面法向量的指向的方式有点不同,圆柱的边缘是竖直的。
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The author analyses dynamic characteristic of cylinder piston-rod displacement track, and presents design principle of the sticking machine with PLC by PID control.