Centerless grinding machine is a kind of grinding machine which does not need to be axis positioned for the processed work-piece. It mainly consists of three mechanisms, grinding wheel, adjusting wheel and work-piece support. Among them, grinding wheel is actually responsible for the grinding job. The adjustment wheel controls the rotation of the work-piece, and at the same time controls the feeding speed. As for the work-piece support, it provide support for the work-piece during the grinding process. These three parts can be used with several combination, while the principle is the same except the grinding shutting down.