Saman da aka karkata yana ɗaya daga cikin tsarin mold ɗin. Kafin tsarawa, yi nazari mai tsari game da tsarin samfurin. Dangane da tsarin samfurin, hanyar da aka gabatar don magance wasu yankewa (hanyar da ake bi don magance yankewa a ƙasa tana da matsayin layi), sannan matsayin layi da saman da aka karkata Ina bambanci yake?
Babban ƙa'idar lif da matsayin layi shine maye gurbin motsi na tsaye na mold da alkiblar kwance. Babban bambanci yana cikin hanyoyin daban-daban na ƙarfin tuƙi: lif ɗin yana motsawa galibi ta hanyar motsi na farantin thimble. Ba kamar matsayin layi ya dogara ne akan ƙirar buɗewa da rufewa na molds na maza da mata ba. Saboda haka, ƙirar lif ɗin tana da alaƙa da bugun farantin ejector, wanda shine babban bambanci tsakanin ƙirar lif da ƙirar matsayin layi.
Matsalolin da ya kamata a kula da su yayin tsara rufin da ke gangarowa:
1). Rufin da aka karkata ba wai kawai yana taka rawar jan tsakiya ba ne, har ma yana iya taka rawar fitar da iska. 2). Dole ne a tsara rufin mai gangara da jiki mai tsayin 5-10MM a matsayin wurin rufewa da kuma matsayin wurin taɓawa. 3). Nisa tsakanin jan tsakiya ya kamata ya zama aƙalla 2mm fiye da zurfin da aka yanke. 4). Ya kamata a sami isasshen sarari don saman da aka karkata ya zame a inda saman da aka karkata ya zame a saman manne na samfurin, kuma kada a sami shebur ko tsangwama ga wasu sassa.

Idan saman yana karkata, zai bar alama a kan samfurin, wanda hakan al'ada ce.