worm gear and worm wheel

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


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