pūtake whakamātau wai
He tātai pūhā wai ko te tātai pūhā wai, he take hōu i roto i te whakamahinga o te wai tahuna me te hanga puhipuhi, i hangaia hei whakatupu i ngā whenua katoa. Ko tēnei take hōu e whakauru ana i ngā rara moana me ngā momo kutikuti matataki hōu ki te hanga i ngā pūtahi mō te āwhina ki te hī i te wai. Ko te hanga ka kitea i ngā tuhinga tungsten carbide rānei ko ngā whatanga diamond-impregnated e whai ana i te wehi matataki pai rawa me te oranga mahi nui. Ko ngā tātai pūhā wai hou ka tae atu ki ngā momo itiiti, inanahi ko ngā roller cone bits, drag bits, me ngā PDC (Polycrystalline Diamond Compact) bits, inaianei ko ngā take hōu ka whakapakari ai mō ngā momo whenua ā-wāhanga. Ko ngā tātai ka whakauru i ngā horopaki hauika hōu e awhina ana ki te whakamutu i te whakarereke me te waipapa tātai i te mahi, e whakaheke ana i te ururoa me te whakapakari i te oranga o te tātai. Ko ēnei tātai ka hangaia ki te whakaae i ngā paerewa nui, me te hanga tata ki ngā take pērā i te tinana o te whenua, te rahi o te whakanui, me te rahi o te pūtahi kua hiahia. Ko te hunga tātai ka whakaae i ngā whiringa hōu, pērā i te whakanui pūnaha me te whakanui ā-momo, ka whakawhanake ia hei whakarite tonu mō ngā momo hanga puhipuhi rerekē. Ko ngā tātai wai ka hangaia me ngā take hōu pērā i ngā whakatakoto me te tirotiro gauge kia mau ai te tika o te pūtahi me te rahi o te hanga i runga i te mahi.
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