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planet gear

   Also found in: Encyclopedia 0.02 sec.
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Noun1.planet gear - an outer gear that revolves about a central sun gear of an epicyclic trainplanet gear - an outer gear that revolves about a central sun gear of an epicyclic train
epicyclic gear train, epicyclic train - a system of epicyclic gears in which at least one wheel axis itself revolves about another fixed axis
cogwheel, gear, gear wheel, geared wheel - a toothed wheel that engages another toothed mechanism in order to change the speed or direction of transmitted motion


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In response Watt and William Murdock invented the sun and planet gear system, whereby one or more outer gears, or planet gears, rotate around a central or sun gear.
After leaving Kango Hammers, he went to Planet Gears until his retirement in 1995.
Precision honing of the sun and planet gears produces high efficiency with a backlash of less than 8 arc minutes and exact ratios of 3:1 to 64:1.
 
 
 
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