切削深度（ap）：切削工件时已加工表面与待加工表面之间的垂直距离。
Experiment shows that cutting speed has a greater impact on chip deformation, and cutting feed rate is also significantly affected except cutting depth.
实验表明,切削用量中速度对切屑的变形有较大的影响,进给量对切屑形态的影响也比较显著,切削深度的影响则不明显。
参考来源 - 基于高速切削的难加工材料切屑变形研究及虚拟仿真·2,447,543篇论文数据，部分数据来源于NoteExpress
切削深度d是未加工面与已加工面之间的垂直距离。
Depth of cut, d, is the normal distance between the unmachined surface and the machined surface.
工件被夹持到位，铣刀靠着提供安装或铣刀位置及切削深度的安装台定位。
The workpiece is clamped in position, and cutter is located against the setting block, which provides setting or cutter position and depth of cut.
有可能对切削深度产生误判，以至于割得如此之深，需要缝合(或者在极端情况下需要住院)。
It's possible to misjudge the depth of a cut, making it so deep that it requires stitches (or, in extreme cases, hospitalization).
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