在实验中，分别对常规磨削和经精磨后的数控刀片在切削加工中的磨损情况进行了对比。
Wear speed were contrasted for two kinds of NC tools to conventional and fine ground respectively.
有些加工，如精度要求不高或需要切除的金属量较小，也可能只需一次精切削。
Also, in some jobs, fot example, when great accuracy is not needed, or when a comparatively small amount of metal must be removed, a finishing cut may be all that is required.
机械工厂的切削加工有两种，分别称为“粗切削”和“精切削”。
There are two kinds of cuts in machine- shop work called, respectively, the "roughing cut" and the "finishing cut".
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