Makhalidwe amagiya ozungulira:
1. Mukalumikiza magiya awiri akunja, kuzungulira kumachitika mosiyana, mukalumikiza ger yamkati ndi giya yakunja, kuzungulira kumachitika chimodzimodzi.
2. Muyenera kusamala kwambiri poganizira kuchuluka kwa mano pa giya iliyonse mukalumikiza giya yayikulu yamkati ndi giya yaying'ono yakunja, popeza mitundu itatu ya kusokoneza imatha kuchitika.
3. Nthawi zambiri magiya amkati amayendetsedwa ndi magiya ang'onoang'ono akunja
4. Imalola kapangidwe kakang'ono ka makina
Kugwiritsa ntchito zida zamkati:magiya a planetary drive okhala ndi ma high reduction ratios, ma clutches gearbox etc.