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Glossary of Terms E-F-G 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 Eccentricity - When two diameters share a common center they are said to be concentric. Deviations from theoretical or perfect concentricity are called eccentricity. Extended Pitch (Large Roll) - Sprockets designed to operate with large roll extended pitch series chain. Extended Pitch (Small Roll) - Sprockets designed to operate with small roll extended pitch series chain. FB - finished bore FC - flame cut Fabricated Construction - is a method of manufacturing sprocket or gear blanks by welding pieces of steel together and machining them to required dimensions. Linn Gear Co. has a tremendous amount of experience with this method of manufacturing and can supply large sprockets and gears of fabricated construction as economical alternatives to castings or forgings, particularly when required quantities are small. Face Width - is the width of the pitch surface. For herringbone gears, this includes the width of the surface containing both of the helices and the groove width. Finished Bore (FB) - This term is used to identify a sprocket or gear whose center hole has been machined to a tolerance acceptable for mounting the part on a shaft. There are many methods of mounting sprockets and gears on shafts. A common method is the use of a key and set screw(s). Linn Gear Co. stocks a line of Finished Bore sprockets (FB's) which include a keyway and set screw. Flame Cut (FC) - refers to the process of cutting a sprocket from steel plate with a gas torch. The torch cuts the tooth profile on which the chain operates. No additional, close-tolerance machining process is typically applied. This type of nominal-tolerance tooth profile is acceptable for many applications using fabricated or cast chains. We do not recommend the use of flame cut tooth profiles with roller chains. Gear Ratio - is the ratio of the numbers of teeth in mating gears. (Driver/Driven) Gullet - space between two teeth of a sprocket or gear. |