2. For the case can not use the center hole of the hollow shaft or short shaft positioning, cylindrical surface available for positioning the outer surface of the shaft positioning clamping, gripping and torque transmission. Generally use the three-jaw chuck, four jaw chuck and other common fixture, or a variety of high-precision automatic centering fixture, such as a liquid plastic thin-walled centering fixture, such as a diaphragm chuck. 3. With the outer surface of various plug or mandrel rod clamping position when the hollow shaft machining shaft parts, used a variety of plug or mandrel rod with a center hole to install the workpiece. When small cone common plug; mandrel rod large cone used with plug and threaded spindle error on ⑸ helical surface is one of the causes of the compression nut face runout, it should control the precision of the thread. When the compression nut on the spindle runout is too large, will be pressed rolling bearing inner ring is tilted axis, thus causing the spindle radial runout. 2. The main problem points and measures Spindle machining process is how to ensure the spindle bearing journal of the size, shape, location accuracy and surface roughness of mechanical shaft parts, inside front spindle, outer cone shape accuracy, surface roughness and their the positional accuracy of the bearing journal. Spindle bearing journal of dimensional accuracy, shape accuracy and surface roughness can be used to ensure the precision grinding method. Should improve the accuracy of fine grinding prior to baseline. The guarantee front spindle, outer cone shape accuracy, surface roughness same precision grinding method should be used. In order to ensure the outer cone bearing journal relative positional accuracy of automotive shafts, as well as the positional accuracy between the bearing journals, often using a combination of grinding method, the processing of these surfaces in a single setup, shown in Figure 6-4 . The machine has two separate wheel frame, grinding performed at two stations on the former station Ⅰ grinding, after the journal cone, the angle formed by the station Ⅱ wheel, grinding front spindle bearing surface and short taper surface. Precision shaft parts, Anshan shaft parts, please look for the gear provided by Luoyang Fuyuan Fuyuan Gear Machinery Co. Luoyang Fuyuan Gear Machinery Co., Ltd. (www.lyfycl.com) strong, credible, in Luoyang gear industry has accumulated a large number of loyal customers. The company better work attitude and constantly improving innovative ideas will lead Fuyuan gear and you hand into the brilliant, for a better future!