Fadada diamita fasaha ce ta sarrafa matsa lamba da ke amfani da na'ura mai aiki da karfin ruwa ko injina don amfani da karfi daga bangon ciki na bututun karfe don fadada bututun karfe a waje. Hanyar injiniya ta fi sauƙi kuma mafi inganci fiye da hanyar hydraulic. An yi amfani da bututun mai daɗaɗɗen manyan diamita da yawa a duniya wajen haɓaka aikin haɓakawa. Tsarin shine:

Fadada injina yana amfani da shingen yanki a ƙarshen mai faɗaɗa don faɗaɗa a cikin radial shugabanci ta yadda bututun blank ya taka tare da tsayin shugabanci don gane aikin nakasar filastik na duk tsawon bututu a cikin sassan. An raba shi zuwa matakai 5

1. Matakin zagaye na farko. Ana buɗe shinge mai siffar fan har sai duk tubalan masu siffar fan sun taɓa bangon ciki na bututun ƙarfe. A wannan lokacin, radius na kowane batu a cikin bututun ciki na bututun ƙarfe a cikin tsayin mataki kusan iri ɗaya ne, kuma bututun ƙarfe na farko yana zagaye.

2. Matsayin diamita mara kyau. Tushe mai siffar fan yana farawa don rage saurin motsi daga matsayi na gaba har sai ya kai matsayin da ake bukata, wanda shine yanayin da'irar ciki na bututu da aka gama da ake buƙata ta inganci.

3. Matakin sake dawowa. Tushe mai siffar fan zai kara raguwa a matsayi na mataki na 2 har sai ya kai matsayin da ake bukata, wanda shine matsayi na ciki na ciki na bututun karfe kafin a sake komawa kamar yadda tsarin tsari ya buƙaci.

4. Matsa lamba da kuma barga mataki. Katangar sashin ya kasance a tsaye na ɗan lokaci kafin ya sake komawa kan kewayen bututun ƙarfe na ciki. Wannan shine matakan da ake buƙata na matsa lamba da kwanciyar hankali na kayan aiki da tsarin fadada diamita.

5. Matakin saukewa da dawowa. Sashin toshe cikin sauri ya ja da baya daga matsayin kewayen ciki na bututun ƙarfe kafin a dawo da shi, har sai ya kai matsayin faɗaɗa na farko, wanda shine mafi ƙarancin ƙanƙancewa na shingen ɓangaren da ake buƙata ta hanyar haɓaka diamita.

A cikin aikace-aikacen aikace-aikacen, a cikin aiwatar da sauƙi, ana iya haɗuwa da matakai na 2 da na 3 da kuma sauƙaƙe, wanda ba zai shafi haɓakar haɓakar bututun ƙarfe ba.