1. Kaha rawa—me te āhua o te hoahoa kowakawaka rongonui o te ao, he maha ngā wā ka piki ake te kaha o te hanganga ki ētahi atu he rite te matotoru. 2. Ngā hiri me te whakawhitiwhiti—I hangaia mā te hangarau whakakikorua hurihuri CNC, e whakapūmau ana i ngā inenga āhuahanga katoa. Ka taea te whakapūmau i te manawanui whānui ki te mm, ka tutuki i ngā inenga katoa ngā whakaritenga ISO13920 A-grade, ā, ka tino whakapai ake i te mahi hiri me te whakawhitiwhiti o te tatau kohua. 3. Utu—I te mea kua tangohia e te tatau kohua ngā whakaaro hoahoa hou, ehara i te mea ka whakaitihia te taumaha o te waahanga engari ka tino penapenahia hoki te utu whakaputa o ia mita tapawha. 4. Te whakapaunga pūngao—Nā te hoahoa kōpikopiko e whakamahia ana e te tatau kohua i whakaiti i te whakapaunga pūngao, ā, i whakaitihia hoki te kaha o te irahiko o te tipu hikohiko mā te 20% pea, nō reira ka hangaia he taiao mahi whakamarie ake mō ngā kaimahi whakahaere. 5. Te roa o te mahi— He mea hanga ki te pereti konumohe pai rawa atu, he tino ātete ki te wera me te waikura te tatau kohua, ā, mā ēnei katoa ka roa ake te roa o te mahi o te tatau kohua.