There are two kinds of cuts in machine- shop work called, respectively, the "roughing cut" and the "finishing cut".
机械工厂的切削加工有两种，分别称为“粗切削”和“精切削”。
When roughing, the user can specify a minimum thickness to machine. Areas smaller that this thickness will not be cut.
粗加工中，使用者可以设置最小留量，小于这个留量厚度的区域就不去加工了。
Generally speaking, bars of steel, forging, castings, etc. are machined to the required shape and size with only one roughing and one finishing cut.
一般地说，钢质棒料、锻件、铸件等只经一次粗切削和一次精切削即可达到所要求的形状和尺寸。
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