Kalmar "helix angle" tana nufin wani muhimmin ra'ayi a cikin ilimin lissafi da injiniyanci, musamman a fannin ƙira da machining. An ayyana kusurwar helix a matsayin kusurwar da aka samu tsakanin madaidaicin madauri ko karkace hanyar zaren, dunƙule, ko gear da kuma jirgin sama daidai da axis na juyawa ko motsin layi.A cikin mahallin zaren, kusurwar helix tana wakiltar kusurwar da zaren nannade a kusa da silinda ko farfajiyar conical. Ana auna shi ta hanyar karkatar da helix ɗin zaren zuwa gaɓar abin silinda ko mazugi. A cikin screws, kusurwar helix tana ƙayyade filin zaren kuma yana rinjayar aikin dunƙule, gami da watsa wutar lantarki da ƙarfin ɗaukar nauyi. helical gear da jirgin sama perpendicular zuwa ga gear ta axis. Gears na Helical suna da hakora waɗanda aka yanke a cikin sifa mai tsayi, wanda ke haifar da haɗin gwiwar haƙoran a hankali yayin da suke haɗuwa da juna. Angle na helix yana rinjayar santsin aikin kayan aiki, matakan amo, da kuma rarraba kaya tsakanin haƙoran gear. axis na jujjuya ko motsi na linzamin kwamfuta, kuma yana da tasiri mai mahimmanci ga ayyuka da aikin abubuwan da aka zana da gears.