Qaab dhismeedka godka koorta ee godka ah wuxuu qiyaas ahaan u qaybiyaa laba nooc. Midda ugu caansan ayaa ah in sanku uu leeyahay dalool wareeg ah oo wareeg ah, marinka biyuhuna uu la jaanqaadayo daloolka wareegga, sidaas darteed marka dareeraha uu ka galo daloolka mashiinka cadaadiska sare leh, wuxuu soo saari doonaa wareeg xawaare sare leh. Dareeraha ayaa qulqulaya, ka dibna waxaa laga saarayaa darbiga daloolka iyada oo loo marayo daloolka daloolka ka yar ee ka yar daloolka wareega.

Midda kale waxay tahay in dareeraha uu ku faafo dusha sare ee conical-ka horay loo soo saaray. Xalkani wuxuu ku habboon yahay codsiyada leh koonto godad ballaadhan leh.