Qeybta firfircoon iyo qaybta wada-qaadista ee qulqulka ayaa si tartiib tartiib ah ugu hawl gala dusha sare ee taabashada, ama iyadoo loo adeegsanayo dareeraha gudbinta (yerralic), si ay labada qaybood u sheegaan labada qaybood ee midba midka kale ku xirmo.
Waqtigan xaadirka ah, isku-dhafka xamuulka guga ayaa si ballaaran loogu isticmaalaa baabuurta (oo loo yaqaan 'Cluft'. Traquepe-ka uu ka soo baxayo mashiinka waxaa loo gudbiyaa diskiga loo maro kala-baxa u dhexeeya flufweel iyo dusha sare ee diskiga cadaadiska iyo diskiga daadashada. Markuu darawalku murugoodo badeecadaha xajmiga ah, dhamaadka weyn ee diaphragm-ka diphragm wuxuu ku kaxeeyaa cadaadiska dib-u-dhigga dib-u-gudbinta oo loo maro gudbinta qaybta. Qeybta wadaaga ayaa laga soocayaa qaybta firfircoon.
