Izici ze-helical gears:
1. Uma uhlanganisa amagiya amabili angaphandle, ukuzungeza kwenzeka ngakolunye uhlangothi, lapho kuhlanganisa igiya langaphakathi ngegiya langaphandle ukuzungezisa kwenzeka ngendlela efanayo.
2. Kufanele kuqashelwe ngenani lamazinyo egiyeni ngalinye lapho kuxhunywa igiya elikhulu (langaphakathi ) ngegiya elincane (langaphandle), njengoba kungase kwenzeke izinhlobo ezintathu zokugxambukela.
3. Imvamisa amagiya angaphakathi ashayelwa amagiya amancane angaphandle
4. Ivumela umklamo ohlangene womshini
Ukusetshenziswa kwamagiya angaphakathi:iplanethi yegiya yokushayela izilinganiso zokunciphisa okuphezulu, ama-clutch njll.