pic: Planetary...Wheel?

[Jizvonius]

Originally Posted by RogerR

needle bearings use thin cylindrical rollers instead of a balls (in the case of ball bearings).

Indeed, and for larger diameter shafts, they are generally a whole lot smaller than ball bearings that will get really huge and heavy.

Andy Baker's suggestion in the other thread was also a really good idea for taking the load off the gears and constraining the wheel motion, just depends on what you choose.

Jevawn