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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.
A die grinder is a simple handheld tool that can grind any material such as wood, metal or plastic. The tool works by rotating a grinding nose at speeds measured in RPM or rotations per minute. Some of the most powerful die grinders can reach speeds of up to 30,000 RPM.