Positioning base the decision of والعتاد shaft on the علبة التروس الكوكبية surface of the main processing purchase, to a huge extent depends on the selection of locating datum structure characteristics and the main shaft of the 
shaft parts on the surface of the primary location accuracy necessity is decided the axis because benchmark may be the ideal not just ensure that benchmark is unified, and make the locating datum and the design datum coincidence outdoors circle to get crude benchmark more commonly, on both sides of a razor-sharp hole for good benchmark concrete also take note the following factors: (1) when the decision between machined surface area when the positioning accuracy of high, best carried out in a clamping surface processing (2) for tough machining or when two end middle holes (such as spindle cone hole) can't be used for positioning, to enhance the stiffness of the process program during workpiece processing, just cylindrical surface or cylindrical surface and one end center hole can be utilized as positioning reference
gear shaft
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