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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.
Surface grinding uses a rotating abrasive wheel to remove material, creating a flat surface. The tolerances that are normally achieved with grinding are Â± 2 Ã 10 â4 inches for grinding a flat material, and Â± 3 Ã 10 â4 inches for a parallel surface (in metric units: 5 Î¼m for flat material and 8 Î¼m for parallel surface).