Positioning base the decision of gear shaft upon the surface of the primary processing purchase, to a large extent 
depends on the selection of locating datum structure characteristics and the primary shaft of the shaft parts upon the surface of the primary location planetary gearbox accuracy requirement 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 look datum coincidence outdoors circle intended for crude benchmark additionally, on both sides of a sharp hole for great benchmark concrete also notice the following factors: (1) when the decision between machined surface area when the position accuracy of high, greatest performed in a clamping surface area processing (2) for rough machining or when two end middle holes (such as spindle cone hole) can’t be used intended for positioning, to improve the stiffness of the process system during workpiece processing, just cylindrical surface area or cylindrical surface and one end center hole can be used as positioning reference
gear shaft
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