在这种情况下，切削刀具即钻头快速转动，但工件却根本不动。
In this case, the cutting tool, thAT is, the drill, turns fast, but the workpiece doesn't move AT all.
粗绳子上挂着锐利的工具，即钻头，由踏板上跳跃的人把它拉起又放下。
A sharp tool, or bit, was hung from a rope and jerked up and down by men jumping on a spring-board.
该模型包括了钻头以及钻削操作的重要特性，即钻头的截面几何特征、螺旋角、转速和钻削过程中产生的切削力。
The model includes of important characteristics of drill bit and drilling operation, i. e. sectional geometrical property of drill, spiral Angle, speed and cutting force created during drilling.
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