A decrease drive is a mechanical gadget to shift rotational speed. A planetary decrease drive is a little scale edition using ball bearings in an epicyclic arrangement rather than toothed gears.

Reduction drives are used in engines of all kinds to increase the amount of torque per revolution of a shaft: the gearbox of any car is a ubiquitous exemplory case of a reduction drive. Common home uses are washers, food blenders and window-winders. Reduction drives are also utilized to diminish the rotational swiftness of an insight shaft to an appropriate planetary gearbox output speed. Reduction drives could be a gear train design or belt driven.

Planetary reduction drives are usually attached between the shaft of the adjustable capacitor and the tuning knob of any kind of radio, to allow fine adjustments of the tuning capacitor with even actions of the knob. Planetary drives are found in this situation to avoid “backlash”, which makes tuning simpler. If the capacitor drive has backlash, when one efforts to listen in a station, the tuning knob will feel sloppy and it will be hard to execute small adjustments. Gear-drives can be made to have no backlash by using split gears and spring tension however the shaft bearings have to be very precise.