ABSTRACT
A gear is a modified form of a wheel. It is one of the basic machine elements used for transmitting power and/or motion between two parallel shafts (cylindrical gears, i.e. spur and helical), intersecting shafts (conical gears, i.e. straight and spiral bevel) and non-parallel and non-intersecting shafts (i.e. hypoid gears and worm and worm-wheel). Gear drives are preferred for various power and/or motion transmission purposes due to their compactness and higher reliability. Gears are extensively used in the fields of automobiles, avionics, ship-building, construction machinery, agricultural machinery, machine tools, biomedical applications, domestic appliances, miniature and micro systems and products, etc. Continuous requirements of gears and advancements in these fields have compelled the need to manufacture accurate, high-quality and high-reliability gears.
