Nā hiʻohiʻona o nā mīkini helical:
1. I ka ho'opa'a 'ana i 'elua mau pahu ku'eku'e, 'o ka ho'ololi 'ana ma ka 'ao'ao 'ē a'e, i ka wā e ho'opili ai i ka ger i loko me ka mea ho'ohana o waho, hiki ke 'ano o ka ho'ololi 'ana ma ka 'ao'ao like.
2. Pono e mālama i ka nui o nā niho ma kēlā me kēia mīkini i ka wā e wili ai i kahi mea hana nui (loko) me kahi mea li'ili'i (waho), no ka mea, hiki i nā ʻano keakea ʻekolu.
3. ʻO ka mea maʻamau e hoʻokele ʻia nā mea hana o loko e nā mīkini waho liʻiliʻi
4. Hāʻawi i kahi hoʻolālā paʻa o ka mīkini
Nā hoʻohana ʻana i nā mīkini kūloko:planetary gear drive of high reduction ratios, clutches etc.