|A worm consisting of a threaded shaft that mates with a worm wheel so that the rotary motion can be transferred at right angle to each other. Because of the high ratios possible with worm gearing maximum speed reduction can be accomplished in less space than many other types of gears.
Efficiency of the worm gear drives depends to a large extent on the helix angle of the worm. Number of starts of the worm gears and higher helix angle proves more efficient than single thread worm gears. Worm gear sets are either left or right hand threads and are with single, double, triple and quadruple thread starts. When properly applied, worms and worm gears provide the smoothest and quietest form of gearing. Proper lubrication enhances efficiency by reducing friction and heat.
Worm and worm gears are used in various industries like power transmission, automobiles, textile machines, presses, conveyors, ship propeller drives, machine tools and many other industries. Materials used for worm is hardened steel, carbon steel, cast-iron, Bronze, acetal and nylon where as for worm gears materials used are Cast-iron, bronze, acetal and nylon however depending on the application.
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