G51.1是可编程镜像。G50.1取消镜像。格式:G51.1 X--Y---; G50.1 X---Y---;如果以Y轴为镜像对称轴:格式:G51.1 X0; (Y轴为镜像对称轴) ------; ------; G50.1 X0;(取消Y轴为镜像对称轴)