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2. Pulley - Wikipedia

   en.wikipedia.org/wiki/Pulley

   A sheave or pulley wheel is a pulley using an axle supported by a frame or shell (block) to guide a cable or exert force. A pulley may have a groove or grooves between flanges around its circumference to locate the cable or belt. The drive element of a pulley system can be a rope, cable, belt, or chain.

3. Belt (mechanical) - Wikipedia

   en.wikipedia.org/wiki/Belt_(mechanical)

   Round belts are a circular cross section belt designed to run in a pulley with a 60 degree V-groove. Round grooves are only suitable for idler pulleys that guide the belt, or when (soft) O-ring type belts are used. The V-groove transmits torque through a wedging action, thus increasing friction.

4. Chevrolet Turbo-Air 6 engine - Wikipedia

   en.wikipedia.org/wiki/Chevrolet_Turbo-Air_6_engine

   The fan is driven by a long V-belt from the back of the engine with an adjustable idler pulley. The belt makes two 90° turns to reach the fan resulting in four 90° twists. An early problem with the fan drive-belt jumping off the pulleys was solved by making the groove in the idler pulley deeper and adding belt guides.

5. Underdrive pulleys - Wikipedia

   en.wikipedia.org/wiki/Underdrive_pulleys

   Underdrive pulleys increase engine output by reducing the draw of the engine's accessories by slowing them down and reducing the horsepower (HP) they use. Horsepower gains from underdrive pulleys can vary by vehicle, engine, number of accessories and the amount of underdrive (improvements of up to 5–15 HP at the wheels have been seen).

6. Continuously variable transmission - Wikipedia

   en.wikipedia.org/wiki/Continuously_variable...

   The plates may be quite thin, around a millimeter thick. The conical pulleys have radial grooves. A groove on one side of the pulley is met with a ridge on the other side and so the sliding plates are pushed back and forth to conform to the pattern, effectively forming teeth of the correct pitch when squeezed between the pulleys.

7. Drill - Wikipedia

   en.wikipedia.org/wiki/Drill

   Some drill presses add a third stepped pulley to increase the number of available speeds. Modern drill presses can, however, use a variable-speed motor in conjunction with the stepped-pulley system. Medium-duty drill presses such as those used in machine shop (tool room) applications are equipped with a continuously variable transmission. This ...