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A die grinder, also known as a rotary tool, is a handheld power tool used for grinding, sanding, honing, polishing, or machining material (typically metal, but also plastic or wood). They are usually pneumatically driven, although electric and flexible shaft drive also exist. Their name comes from one of their earliest and archetypal applications, tool and die work, where they were used to create the precise contours of dies or molds. Especially before the advent of widespread CNC usage, they were heavily relied upon for contouring via manual skill comparable to a sculptor's. CNC now provides much of the contouring for die and mold interior surfaces, but die grinders are still very useful for hundreds of cutting needs, from sculpture-like contouring in the absence of CNC, to cut-off of bar stock, to any of the cutting and grinding needs of fabrication, such as in the work of welders, boilermakers, millwrights, ironworkers (steel erectors), sheet metal workers (such as auto body workers and HVAC technicians), to woodworking (especially cabinet making), hacking, and other hobby or business pursuits. Die grinders are often used for engraving, cylinder head porting, and general shaping of a part. ==Methods of cutting action== The cutting may be done in various ways, including: * Grinding with bonded abrasive stones (called by various names, such as mounted stones, mounted points, or grinding points) * Machining with a burr or small drill bit or endmill * Sanding with coated abrasive, such as small drums made of sandpaper mounted on an expanding rubber mandrel (also called an arbor) * Honing with fine-grit mounted points * Lapping with lapping compound and a mounted lap to embed it * Polishing or buffing with cloth or fiber drums or flaps and polishing compound 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Die grinder」の詳細全文を読む スポンサード リンク
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