使用3d印制机作为生产工具在工业上被称作“加法”制造(与传统的对金属进行裁剪、锥钻、击打的“减法”制造相反)。
Using 3d printers as production tools has become known in industry as "additive" manufacturing (as opposed to the old, "subtractive" business of cutting, drilling and bashing metal).
浮鞋的内部（包括锥型段部分）通常由水泥或热塑性材料组成，如果在套管鞋处井眼还需要继续加深的话这种材料必须被钻掉。
The inside (including the taper) is usually made of cement or thermoplastic, since this material must be drilled out if the well is to be deepened beyond the casing point.
锥钻，打眼钉钻头倾斜的钻子，用于在木头上钻孔以钉角钉或螺钉。
An awl with a beveled tip, used to make holes in wood for brads or screws.
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