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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.
Grinding is the only way to cut hardened steel, like that found in chisels, files and hacksaw blades. But if your grinding wheel is glazed or clogged, there's no tooth and you'll only generate heat. Fix that grinding toothache with a wheel dresser available at tool retailers.