a modern lathe usually has a quick-change gearbox located under the headstock and driven from the spindle through a train of gears.
现代车床一般在主轴箱下装备快速变换齿轮箱,通过一系列齿轮由主轴驱动。
The quick-change gearbox is employed in plain turning, facing and thread cutting operations.
善变的传动箱在简单的转动, 面对和螺纹切口操作被使用.
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