A grinding wheel is used in grinding machines composed of an abrasive compound. Grinding wheels are also used for different abrasive and machining operations. These wheels are generally made of a material consisting of coarse particles pressed and bonded together by a matrix to form a solid, circular shape. The history of grinding wheels began with the natural composite stones used for millstones. Grinding wheels are consumables, and the life span can vary depending upon the use, from less than a day to many years. As the wheel cuts, individual grains of abrasives are released because increased drag pulls them out of the bond. Itâ€™s essential to dress the surface which removes the current layer of abrasive so that fresh and sharp surface exposed to the work surface.