中国妓女与动ZoZ0z的演员表I911国产精九九 APPI99久久99久久精品免费看蜜桃I真实国产乱子伦一区二区三区I精品熟女I珍藏艳照36PI国产51页ixxx视频在线i97视频在线播放i国产一区日本i久草综合网i6I日本XXXXXX公交车上I久久中文字幕人妻熟avI日韩十八禁I成人九九九I超碰666I青青草763

Optical curve grinder is used to grind precision and complex surfaces, including straight lines, arcs, and curves. During the grinding process, the workpiece and grinding wheel can be magnified 50 times by an optical system and projected onto a screen. During work, the operator can observe the grinding wheel processing along the workpiece surface on the screen at any time. The movement of the workpiece can be manually operated or controlled by a DC motor to achieve the purpose of processing the surface.