He rauira mo te whakamahi i ngā kaiwhakarite ira, he momo rauira matua e whakamahi ana hei whakamahi mo te whakamahi i ngā kaiwhakarite ira, ko tēnā ka whai pūtake noa iho i ngā poraka o hinu, āwhiutanga, mākena, rānei i ētahi atu poraka nō te mea he pai ake ngā āhuatanga o te whakamahi. Ko te rauira e whakatakoto ana i te wā o te whakamahi i te kaiwhakarite ira, ka whakamahiia ki te hanga i ngā wāhanga take me ngā āhuatanga paihere 3D nui rawa. Ko te whakamahi i te kaiwhakarite ira he wāhanga o te mahi i te hinu me te whakapakari i a ia ki roto i te kōpuhi kaiwhakarite, e hanga ana i te kōpuhi kaiwhakarite e kīia nei he kaiwhakarite rauira. Ko te tohu whakarite o te kaiwhakarite ka whai painga nui ki ngā āhuatanga o ngā wāhanga take. Ko ngā kā niho e whai ana i ngā rauira spin aluminium mō ngā kaiwhakarite motokā rānei mō ngā wāhanga herehere motokā. Ko ngā rauira kaiwhakarite e whakamahi ana ki te taha tuara, ngā wāhanga pūruki, ngā taha tuatahi rānei me te wāhanga whakaaetanga, ko ngā mea katoa nei e hanga ana i runga i ngā CNC lathes ki te rahinga hihiko me te tahuri pai. He kī mai i te Takiwā Whakamahi Motokā Paiheihei Take, ka taea te hanga i ngā wāhanga take kaiwhakarite paiheihei i te utu iti noa iho mō ngā hoahoa kaiwhakarite paiheihei. Ko ngā rauira e tino nui ana i te katoa o te kaiwhakamahi kaiwhakarite hei whakamana i ngā taupānga pai o ngā wāhanga.