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1. The work center are not fixedIn the process of grinding workpiece positioning be determined by the grinding wheel, roller and plate, the center of the workpiece position O with the movement of the workpiece, the radial plane is not fixed.2. Its positioningGrinding surface of workpiece is positioning basis, therefore, on the surface of the workpiece grinding original error and the error of grinding after will reflect as the positioning error, this will affect the workpiece is the shape of the grinding part size, which reflect the machining error.3. The special workpiece movement control wayWorkpiece movement is controlled by the grinding wheel, roller and plate joint, and to guide is given priority to, the control of the stability of the workpiece movement and grinding process parameters, artifacts related to the roller and plate contact situation.4. High production efficiencySuitable for the batch and mass production, easy to realize automation for production.