事实上，铣削允许的切削速度和进给比车削或钻削高三到四倍。
In fact, the permissible cutting speeds and feeds for milling are three to four times higher than those for turning or drilling.
为扩大这一新技术的应用，本文就枪钻机床和枪钻的结构特点及其切削用量和刀具材料作了介绍。
In order to extend this new technology, the article introduces the mechanism of gun drilling and gun driller, cutting data and tool material.
夹具在机加工作业时夹持工件，但它不象钻模那样包含引导切削刀具的特殊布置。
A fixture holds the work during machining operations but does not contain special arrangements for guiding the cutting tool, as drill jigs do.
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