Notes

[1] If the initial workpiece is solid, a drilling operation must be performed first.

句意：如果工件毛坯是实心的，首先要钻孔。

[2] Unless the work is held on a mandrel, if both ends of the work are to be faced, it must be turned around after the first end is completed and the facing operation repeated.

句意：除非工件固定在心轴上，如果工件两端都要车端面，必须在一端加工完成后，将工件倒过来，重复进行车端面加工。

[3] A spindle gear is mounted on the rear of the spindle to transmit power through the change gears to the feeding box that distributes the power to the lead screw for threading or to the feed rod for turning.

句意：主轴齿轮安装在主轴尾部，通过挂轮把动力传递到进给箱。如果是车螺纹，进给箱就将动力分配到丝杠上；如果是车削，就将动力分配到光杠上。

[4] In peripheral (or slab) milling, the milled surface is generated by teeth located on the periphery of the cutter body.

句意：在圆周（平面）铣削中，铣削表面是由分布在刀体周围的刀齿加工完成的。

[5] Knee is the casting that supports the table and the saddle that gives the table vertical movements for adjusting the depth of cut.

句意：升降台是一个铸件，用来支撑工作台和床鞍，它可以实现工作台的垂直移动以调整切深。

[6] Counterboring is the process of using a counterbore to enlarge the upper end of a hole to a predetermined depth and machine a recess at that depth.

句意：锪沉头孔加工就是利用平底扩孔钻将孔的上端部扩至预定深度，从而加工出一个凹窝（以便螺栓头的埋入）。

[7] The operation of spot facing is slightly different in that the spot facing is usually done above a surface or on a curved surface.

句意：锪凸台加工稍微有所不同，它通常是在平面上或曲面上进行的。

[8] There are many different types or configurations of drill presses, but most drill presses will fall into four broad categories: sensitive bench type, upright type, radial type, and special purpose type.

句意：钻床有很多种类型，但多数钻床都分成四大类：台式钻床、立式钻床、摇臂式钻床和专用钻床。