INTRODUCTION: Because the centreless grinder has the characteristics of high productivity and elimination of positioning errors, it has been commonly used in the field of machining. However, the centreless grinding machine often has prismatic error in the workpiece ground out, if the outer circle of the workpiece ground out by the centreless grinding machine is trigonal shape

Vibrating screening equipment is an important equipment necessary for mining, mineral processing, coal processing, building materials, chemical industry and other departments, and its performance directly affects the production capacity and technical and economic indicators. For vibrating screen, the same fault may be caused by different reasons, and the solution may not be the same.