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Glossary of Terms R A|B|C|D|E|F|G|H|I|J|K|L|M|N|O|P|Q|R|S|T|U|V|W|X|Y|Z RC - hardness of steel measured on the Rockwell `C' scale Rack - Linn Gear Co. manufactures spur gear rack, which is a straight length of square or rectangular steel bar with teeth on one side, across which a pinion is driven. Technically a gear rack is a spur gear with an infinite pitch diameter. Rack Tooth Sprockets - a sprocket tooth form designed to run a length of chain on a straight line, similar to gear rack. Ready Sprocket - An exclusive line of single strand sprockets and a series of interchangeable bolt-on hubs. This system allows easy assembly of single and double-single sprockets in a wide variety of pitches, numbers of teeth and bore sizes. The detachable hubs cut sprocket replacement costs by as much as 50% and making stocking very economical. Roll Diameter or "Roll" - is the diameter of the roller in Roller Chain. The roller is the element of the chain which actually makes contact with sprocket teeth. It is also referred to as the barrel. Roll diameter is one of the primary defining characteristics of a sprocket. Roller Chain - is the most commonly used type of chain used in industry. Many variations exist but in simple terms a roller chain consists of sidebars or plates, rollers, bushings and pins which can be assembled into a continuous loop of a specific desired length and used to transmit power among mechanical components. Root Diameter (RD) - the diameter of the bottoms of the tooth gullets of a sprocket or gear (also referred to as the bottom diameter) |