ngā upoko heke pūtau
He hangarau whakaputa rua te rautaki whakamahi i ngā mahi kaihoro me ngā mahi hanga, e hanga ana hei waihanga i ngā rua tohu hoki ki ngā tahuhu kōhatu mō te tūtohu āwhā. E hanga nei ngā momo whakaputa inohanga nei i te hunga pūtau matua me ngā hoahoa ā-tuaropuke whakahirahira kia puta mai te āhuatanga pai o te whakapapa atu i te whenua me te roa o te whakahaere. Ko ngā tuhinga kiriata e tū nei i runga i ngā rautaki whakaputa, e kitea ana ko ngā rauoho tungsten carbide rānei ko ngā rauoho whatiwhati-harihari, e whakarite ana kia whai painga te whakapapa atu i te kōhatu me te iti iho i te wehe. Ki te kōrero mai i ngā rautaki whakaputa rua ā-rānei, kei raro i ngā hāpori wai whakamua pai e āhei ana ki te motu iho i ngā kōhatu me te whakamahana pai i te wā e mahi ana. Kei reira ngā rau i waenganui i te 4 ki te 12 inch i te ārai, e hanga ana kia tae atu ki ngā āhuatanga kōhatu rerekē me ngā hiahia tonu o te kaupapa. Ka whakamahi i a rātou i ngā rautaki whakaputa rorohiko rānei, kei ia rā he pai ki ngā take rerekē. Hei tirohanga, e hanga nei ngā rautaki kiriata kia noho pai ai te whakapapa atu i ngā tahuhu kōhatu rerekē, mai i ngā kōhatu matakiore ki ngā kōhatu harakeke, e tirotiro ana ki te pai o te rua me te iti iho i ngā utu whakapapa.