Planetary gear reducer St Louis
Advanced Jiffy offers high performance planetary servo gearheads with less than 3 arc-sec backlash in wide range of sizes and motor interfaces.

Parker gearhead highlights:
Right angle and in-line mounting configurations
Size ranges of NEMA 17 to 42 or 30 to 300mm
Standard gear ratios from 3 to 100:1
Custom environmental preparation

An epicyclic gear train consists of two gears mounted so that the center of one gear revolves around the center of the other. A carrier connects the centers of the two gears and rotates to carry one gear, called the planet gear, around the other, called the sun gear. The planet and sun gears mesh so that their pitch circles roll without slip. A point on the pitch circle of the planet gear traces an epicycloid curve.