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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.
grinder - a machine tool that polishes metal. emery wheel, grinding wheel - a wheel composed of abrasive material; used for grinding. machine tool - a powered machine for cutting or shaping or finishing metals or other materials.