Grinding is a finishing process used to improve surface finish, abrade hard materials, and tighten the tolerance on flat and cylindrical surfaces by removing a small amount of material. Strictly speaking, grinding is a subset of cutting, since it shears a tiny chip away for the workpiece in each grain of abrasive functions.
Grinding practice is a large and diverse area of manufacturing and toolmaking. It can produce very fine finishes and very accurate dimensions; it can also rough out large volumes of metal quite rapidly in mass production. Common grinding processes include Surface grinding, Cylindrical grinding, and Creep-feed grinding. Similar abrasive cutting processes are lapping and sanding.