He aha ka Roller Needle Kūlana KiʻekiʻeHāpainā?

ʻO nā wili cylindrical like nā mea wili o nā bearings nila. Ua hoʻolālā ʻia lākou e hōʻemi i ka friction o kahi ʻili e wili ana. Ma muli o kona ʻano, ʻoi aku ka nui o ka ʻili o ka bearing nila e pili ana me ka ʻili waho o ka bearing.

He pālahalaha nā bearings nila axial a he ʻano radial ʻoiai ʻo ke bearings nila radial he ʻano cylindrical a holo like nā wili i ke axis o ke koʻokoʻo.