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A grinding machine, often shortened to grinder, is any of various power tools or machine tools used for grinding, which is a type of machining using an abrasive wheel as the cutting tool. Each grain of abrasive on the wheel's surface cuts a small chip from the workpiece via shear deformation.
1 Coffee grinder, a machine used for grinding coffee. 2  Herb grinder, a grinder used for herbs including marijuana. 3  Meat grinder, a machine used for grinding food.  Tool and cutter grinder, a machine used to manufacture or resharpen cutting tools.