Metal is molded into a shape to make a tool. There are many different cutting methods, turning, shaping, drilling, broaching, just to name a few. There are also many ways to form metal, like, forging, shearing, drawing, and extrusion.
Some Moderns machines used in metal work include, chemical machining, laser machining, and electronic beam machining.
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Fitness/ Coarseness of the surface: how brittle/ductile the metal is, the cutting tool you are using, how sharp the tool is, how fast you are cutting it, and the temperature of the metal