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