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Positioning base the choice of gear shaft on the surface of the main processing order, to a large extent depends on the selection of locating datum structure features and the main shaft of the shaft parts on the surface of the primary location accuracy necessity is set the axis since benchmark may be the ideal not only make sure that benchmark is unified, and make the locating datum and the design datum coincidence outdoors circle intended for crude benchmark more commonly, on both sides of a sharp hole for fine benchmark concrete also notice the following points: (1) when the decision between machined surface area when the positioning accuracy of high, planetary gearbox greatest performed in a clamping surface area processing (2) for rough machining or when two end center holes (such as for example spindle cone hole) can’t be used designed for positioning, to improve the stiffness of the process program during workpiece processing, just cylindrical surface area or cylindrical surface area and one end center hole can be used as positioning reference