久久国产精品偷-精品久久久久久久久中文字幕-国产欧美一区二区精品性色-真人做人试看60分钟免费视频-亚洲日本va中文字幕

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.