worm gear and worm wheel

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

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