SCIENCE AND TECHNOLOGY ENGLIAH FOR MECHANICAL ENGINEERING 2. Machining on preset machine tools. The positions preset of cutting tools and/or stoppers relative to the‖预调,预置 workpiece are preset and fixed on the machine tool stopper These positions remain unchanged in machining an定程器 entire batch of workpieces. Before machining, the挡块 turning tool and the stopper are preset according to multi-cut the required diameter d and length I with their ashes tolerances. Keeping the positions of the turning tool 多刀车床 and the stopper unchanged, the machining accuracy turret lathes of the batch of workpieces can be achieved in the 转塔车床 operation Many types of machine tools have been designed planer-type for this purpose, such as multi-cut lathes, turret lathes, milling planer-type milling machines and some automatic machines machine tools 龙门铣床SCIENCE AND TECHNOLOGY ENGLISH FOR MECHANICAL ENGINEERING 2. Machining on preset machine tools. The positions of cutting tools and/or stoppers relative to the workpiece are preset and fixed on the machine tool. These positions remain unchanged in machining an entire batch of workpieces. Before machining, the turning tool and the stopper are preset according to the required diameter d and length l with their tolerances. Keeping the positions of the turning tool and the stopper unchanged, the machining accuracy of the batch of workpieces can be achieved in the operation. Many types of machine tools have been designed for this purpose, such as multi-cut lathes, turret lathes, planer-type milling machines and some automatic machine tools. preset 预调,预置 stopper 定程器 挡块 multi-cut lathes 多刀车床 turret lathes 转塔车床 planer-type milling machines 龙门铣床