Worm and Wheel
Worm and Wheel : A type of gearing system used when very large reduction in speed is required. The worm is a small gear resembling a course screw thread, which meshes with the teeth on the rim of the wheel, which is of larger diameter. The shaft carrying the worm gear is perpendicular to the shaft carrying the 'wheel' and off-set from it. The 'worm' is rotated thus turning the wheel around at a slower rate
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