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  2. Revolutions per minute - Wikipedia

    en.wikipedia.org/wiki/Revolutions_per_minute

    1 / 60 ⁠ Hz = 0.01 6 Hz. SI base units. 0.01 6 s −1. Revolutions per minute (abbreviated rpm, RPM, rev/min, r/min, or r⋅min−1) is a unit of rotational speed (or rotational frequency) for rotating machines. One revolution per minute is equivalent to ⁠ 1 60 ⁠ hertz.

  3. Underdrive pulleys - Wikipedia

    en.wikipedia.org/wiki/Underdrive_pulleys

    Underdrive pulleys. Underdrive is the slowing of the rate of rotation in a system, achieved by either making the crank or main (drive) pulley smaller or making the accessory (driven) pulley larger than the original diameter pulleys. Underdrive pulleys increase engine output by reducing the draw of the engine's accessories by slowing them down ...

  4. Speeds and feeds - Wikipedia

    en.wikipedia.org/wiki/Speeds_and_feeds

    Cutting speed may be defined as the rate at the workpiece surface, irrespective of the machining operation used. A cutting speed for mild steel of 100 ft/min is the same whether it is the speed of the cutter passing over the workpiece, such as in a turning operation, or the speed of the cutter moving past a workpiece, such as in a milling operation.

  5. Belt (mechanical) - Wikipedia

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

    The angular speed is inversely proportional to size, so the larger the one wheel, the less angular velocity, and vice versa. Actual pulley speeds tend to be 0.5–1% less than generally calculated because of belt slip and stretch. In timing belts, the inverse ratio teeth of the belt contributes to the exact measurement. The speed of the belt is:

  6. Gear train - Wikipedia

    en.wikipedia.org/wiki/Gear_train

    A gear train or gear set is a machine element of a mechanical system formed by mounting two or more gears on a frame such that the teeth of the gears engage. Gear teeth are designed to ensure the pitch circles of engaging gears roll on each other without slipping, providing a smooth transmission of rotation from one gear to the next. [2]

  7. Dual-mass flywheel - Wikipedia

    en.wikipedia.org/wiki/Dual-mass_flywheel

    Dual-mass flywheel section. A dual-mass flywheel (DMF or DMFW) is a rotating mechanical device that is used to provide continuous energy (rotational energy) in systems where the energy source is not continuous, the same way as a conventional flywheel acts, but damping any violent variation of torque or revolutions that could cause an unwanted vibration.

  8. Overdrive (mechanics) - Wikipedia

    en.wikipedia.org/wiki/Overdrive_(mechanics)

    A plate warns to only engage the unit in third and fourth gears. Overdrive is the operation of an automobile cruising at sustained speed with reduced engine speed (rpm), leading to better fuel consumption, lower noise, and lower wear. [1] The term is ambiguous. [1] The most fundamental meaning is that of an overall gear ratio between engine and ...

  9. Differential pulley - Wikipedia

    en.wikipedia.org/wiki/Differential_pulley

    A dumb pulley can lift very large masses a short distance. It consists of two fixed pulleys of unequal radii that are attached to each other and rotate together, a single pulley bearing the load, and an endless rope looped around the pulleys. To avoid slippage, the rope is usually replaced by a chain, and the connected pulleys by sprockets.