A decrease drive is a mechanical device to shift rotational quickness. A planetary 
decrease drive is a little scale edition using ball bearings within an epicyclic arrangement instead of toothed gears.
planetary gearbox Reduction drives are used in engines of all types to increase the quantity 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 washing machines, meals blenders and window-winders. Reduction drives are also utilized to diminish the rotational speed of an input shaft to an appropriate output speed. Decrease drives could be a gear train style or belt driven.
Planetary reduction drives are usually attached between your shaft of the variable capacitor and the tuning knob of any kind of radio, to allow good adjustments of the tuning capacitor with even motions of the knob. Planetary drives are used in this situation in order to avoid “backlash”, making tuning simpler. If the capacitor drive offers backlash, when one tries to listen in a station, the tuning knob will feel sloppy and it will be hard to perform small adjustments. Gear-drives could be made to haven’t any backlash through the use of split gears and springtime tension however the shaft bearings need to be very precise.