1) Spur Gear-Parallel and co-planer shafts connected by gears are called spur gears. The arrangement is called spur gearing. Spur gears have straight teeth and are parallel to the axis of the wheel. Spur gears are the most common type of gears. The advantages of spur gears are their simplicity in design, economy of manufacture and maintenance, and absence of end thrust.
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Princeton's WordNet(5.00 / 2 votes)Rate this definition: 1  affinity(noun) (immunology) the attraction between an antigen and an antibody. 2  affinity(noun) (anthropology) kinship by marriage or adoption; not a blood relationship.