A. The dimensional tolerance and roughness of each processed part should meet the requirements of the drawing.
B. The shape and position tolerances of each machined surface should conform to the drawings.
C. The core diameter of the shaft, the diameter and roughness of the bearing, the outer diameter and roughness of the rotor core, the distance between the bearings at both ends, and the coaxiality of the core outer circle and the shaft are the key to processing. The shaft, the iron core, and the fan blades should have proper tightness to ensure that the rotor core and fan blades are not loose or move in series during the operation of the motor. In addition, the dimensional tolerances of shaft extension and keyway should meet the requirements of relevant product standards for installation dimensional tolerances.