The arrangement of gears seen above is called a worm and worm wheel. The worm, which in this worm gear and worm wheel example is certainly brown in colour, only has one tooth but it is like a screw thread. The worm wheel, coloured yellow, is like a standard equipment wheel or spur equipment. The worm constantly drives the worm wheel circular, it is never the contrary way round as the system tends to lock and jam
worm gear and worm wheel
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