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At present, the clamp of the rolling gear usually adopts the clamp provided by the machine tool, and the versatility is poor, and since the base is usually connected with the whole machine, when the fault occurs, the repair and replacement of the base is very difficult. When the axis of the correction machining mandrel coincides with the axis of rotation of the machine tool, the base is integrally connected with the machine tool, and even the mandrel and the center axis of rotation cannot coincide. For example: the 68 hobbing machine I imported from Germany, the positioning reference between the mandrel and the base is a