A reduction drive is a mechanical device to shift rotational swiftness. A planetary reduction drive is a little scale edition using ball bearings within an epicyclic arrangement rather than toothed gears.
Reduction drives are found in engines of all kinds to increase the quantity of torque per revolution of a shaft: the gearbox of any car is a ubiquitous exemplory case of a decrease drive. Common household uses are washers, food blenders and window-winders. Decrease drives are also 
used to diminish the rotational quickness of an insight shaft to a proper output speed. Reduction drives can be a gear train design or belt driven.
Planetary reduction drives are typically attached between the shaft of the variable capacitor and the planetary gearbox tuning knob of any radio, to allow fine adjustments of the tuning capacitor with simple movements of the knob. Planetary drives are found in this situation to avoid “backlash”, which makes tuning easier. If the capacitor drive has backlash, when one tries to tune in a station, the tuning knob will feel sloppy and it’ll be hard to execute small adjustments. Gear-drives can be made to have no backlash through the use of split gears and spring tension but the shaft bearings need to be very precise.