Ƙaƙwalwar saman yana ɗaya daga cikin tsarin ƙirar.Kafin zayyana, yi nazari na tsari na tsarin samfurin.Dangane da tsarin samfurin, tsarin da aka gabatar don magance wasu ƙananan yanke (nau'in ma'amala da ƙananan yanke shima yana da matsayi na jere), sannan matsayi na layi da saman karkata Ina aka bambanta?
Babban ka'idar mai ɗagawa da matsayi na jere shine maye gurbin motsi na tsaye na mold tare da jagorar kwance.Babban bambanci ya ta'allaka ne a cikin mabambantan hanyoyin ƙarfin tuƙi: mai ɗagawa galibi yana motsawa ta motsin farantin thimble.Ba kamar matsayi na jere ya dogara ne akan zane na budewa da rufewa na namiji da mace ba.Sabili da haka, ƙirar mai ɗagawa yana da alaƙa da bugun jini na farantin ejector, wanda shine babban bambanci tsakanin ƙirar ɗagawa da ƙirar matsayi na jere.
Matsalolin da ya kamata a kula da su yayin zayyana rufin rufin da ke kwance:
1).Rufin da aka karkata ba wai kawai yana taka rawar core ja ba, har ma yana iya taka rawar fitar da shi.2).Dole ne a tsara rufin da ke kwance tare da madaidaiciyar jiki mai tsayi 5-10MM a matsayin matsayi na hatimi kuma a matsayin jirgin sama mai taɓawa.3).Matsakaicin nisa ya kamata ya zama aƙalla 2mm girma fiye da zurfin da aka yanke.4).Ya kamata a sami isasshen sarari don saman mai karkata ya zamewa zuwa inda saman nunin nunin ya zame akan saman manne na samfurin, kuma kada a sami sheƙa ko tsoma baki tare da wasu sassa.

Idan saman yana karkata, zai bar tambari akan samfurin, wanda shine al'adar al'ada.