Magiya a helical omwe amayikidwa pamabokosi a helical m'makina onyamulira ndi gawo lofunikira kwambiri pakuwonetsetsa kuti magetsi azitha kuyenda bwino. Mapangidwe ake apadera a helical amachepetsa phokoso ndi kugwedezeka, kupititsa patsogolo magwiridwe antchito. Makina olondola a gear set amathandizira kuchitapo kanthu mosasamala, kumapereka mphamvu zonyamula katundu. Zokwanira pamapulogalamu osiyanasiyana okweza, zimatsimikizira kudalirika komanso kulimba, zomwe zimapangitsa kukhala gawo lofunikira kwambiri pamakina amakono okweza.
Makampani khumi apamwamba kwambiri ku China, okhala ndi antchito a 1200, adapeza zinthu zonse za 31 ndi ma patent 9. Zida zopangira zapamwamba, zida zopangira kutentha, zida zoyendera.