Definition. A grinding machine is a machine for material removal with geometrically non-defined, bonded cutting edges, where the relative movement between tool and workpiece is rotational or lin- ear. The machine further must provide relative feed and positioning movements between tool and workpiece.A grinding machine, often shortened to grinder, is a power tool (or machine tool) used for grinding. It 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.