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Glossary of Terms A-B 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 ADD - addendum ANSI - American National Standards Institute Addendum (ADD) - is the radial or perpendicular distance between the pitch circle and the top of the teeth. Alignment - Accuracy of the alignment of shafts on which gears are mounted is a critical factor in their life and performance. Shafts should be set parallel in spur and helical gear sets, and perpendicular in most bevel and worm sets. Misalignment of shafts is one of the most common causes of premature gear failure or other performance issues such as noise. BHN - Brinell Hardness Number, a measure of the hardness of a material such as steel, measured on the Brinell scale Backlash - is the amount by which the width of a tooth space exceeds the thickness of the engaging tooth on the pitch circles. Backlash Variation - is the difference between the maximum and minimum backlash occurring in a whole revolution of the larger of a pair of mating gears. Bevel Gears - are gears of conical form designed to operate on intersecting axes. These gears allow transmission of power "around corners" so to speak as their shafts intersect. Most commonly the shafts will intersect at a 90° angle. Straight bevel gears (as opposed to spiral bevel gears) have teeth that are straight, radially from the gears center point. Bore - the diameter of the hole in a sprocket, gear, bushing, etc. Bottom Diameter - The diameter of a circle measured across the bottoms of opposite tooth spaces. Sometimes referred to as the Root Diameter Bull Gear - When considering a set of two gears one will usually be smaller than the other. The smaller gear is referred to as the pinion. The larger gear is sometimes call a "Bull" gear. Burning - cutting steel plate with a torch Bushing - This term refers to a mechanical device used for mounting a sprocket or gear on a shaft. Several types of bushings exist including straight bronze sleeves and the split-tapered style, of which there are several (e.g. - B-Loc, Taper-Lock®, Q.D.®). |