ʻO nā hāmeʻae pili ana i ka mīkini ma ka ʻaoʻao o ka neʻe ʻana o ka neʻe ʻana a me ka mana o nā ʻāpana mechanical, e ka niho niho, ka niho niho, ka maka hope, ka maka maʻamau, ka pōʻai luna niho, ka pōʻai kumu niho, ka pōʻai kumu, ka pōʻai mahele a me nā mea ʻē aʻe. ʻāpana, hoʻohana nui ʻia ia i ka hoʻouna ʻana i ka mīkini a me ke kahua mechanical āpau.
ʻO ka hana o ka mīkini ka mea nui e hoʻouna i ka mana, hiki iā ia ke hoʻololi i ka rotation o kahi lāʻau i kahi kumu ʻē aʻe, hiki i nā hui ʻokoʻa ke pāʻani i kahi ʻano ʻē aʻe, hiki ke ʻike i ka deceleration mechanical, ulu, hoʻololi i ke kuhikuhi a me ka hoʻohuli ʻana i ka hana, ʻo nā mea hana mechanical. hiki ole ke hookaawaleia mai ke kaa.
Nui nā ʻano o nā ʻōhua.E like me ka hoʻokaʻawale ʻana o ka shaft gear, hiki ke hoʻokaʻawale ʻia i ʻekolu mau ʻano: parallel shaft gear, intersecting shaft gear a staggered shaft gear.Ma waena o lākou, ʻo nā mea hoʻokalakupua like pū kekahi me nā mea spur, helical gear, internal gear, rack and helical rack, etc. kaʻa, ka mea ilo, ka mea hana hypoid a pēlā aku.