A planetary gear is an arrangement of gears in which a central “sun” gear rotates as an outer ring is turned. Typically these have 3 or 4 “planet” gears to transfer energy from the ring. This impressive feat of engineering has 10 planet gears with a square sun gear. This 3D-printed double planetary gear is pretty awesome too.
THE BEST Gears
Plane Pieces’ drink coasters are a great gift for aviation enthusiasts. They’re made using authentic Pratt & Whitney gears from WWII radial airplane engines. Each one is encased in clear resin, surrounded with a machined aluminum outer ring, and has a protective bumper underneath. Sold individually, or in sets of four.
Flat pack model maker Ugears 48-piece kit is one of their easier builds, yet it’s simply fascinating to watch. The mechanical contraption converts air pressure to movement, which in turn spins a pointer which acts as a sort of decision maker for the next task for you to work on.
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