CNC lathes, CNC milling machines, and CNC camshaft grinders will be used during production. Electric sharpeners that work with belt grinders are usually classified as expert machines. Electrical powered burr grinders are available in many variations. Honing machines are much more compliant than grinders. Hydrostatic drives are also used in railway maintenance machines such as tampers and rail grinders. The pulverizers may be ball mills, rotating drum grinders, or other types of grinders. Hydrostatic drives are also utilised in railway maintenance machines (tampers, rail grinders). Discs for pneumatic grinders also come much smaller. However, there are also small electric grinders and large pneumatic grinders. The edges are commonly put on by hand-held routers, grinders, or CNC equipment. They are used only in vertical or horizontal spindle grinders. They are also common in machine shops, along with die grinders and bench grinders. There were sickles and stone grain grinders. With the advent of motorized grinders, use of the mortar and pestle has decreased. In 1842, they added production of coffee, pepper, and salt grinders.