When work is brought in contact with a rotating grinding wheel, each abrasive grain on the wheel's surface acts as a cutting tool and removes a tiny metal chip. When a grain becomes dull, frictional heat between the wheel and work-piece causes grains to break away and expose sharp, new grains, making grinding wheels a self-sharpening cutting tool. Before a wheel touches work, though, there are steps to follow to achieve efficient grinding.
展开▼