dth bit pūtake
He tā ki runga i te DTH (Down-the-Hole) he tā whakamahinga matihiko e whakaaetia mō te whakapapa pai o ngā kohatu i waenganui i ēnei mahere tā. Ko tēnei hanganga whakamahi hou e whakaaturia ana i te pūtaha e mahi nei i te taha raro o te rua, tuatahitia ki muri i te tā. E ai ki te whakahaere, ka tukua atu ngā pūkana nui rawa atu ki te mata o ngā kohatu, ahakoa ko te whiringa anō e mahi nei, e hanga ana i te kawe pai ake me te kawe kaha. Ka hanga ngā tā DTH i te tungsten carbide inserts rānei, ngā pūtaiao e tūhono ana ki te whakatika pai o te kawe kohatu. Ka puta ngā tā nei i waenga i ngā whatitiri e rite ana, e whai ake ana mai i te 3 ki te 24 inches i te hiamoe, me utu pai tonu hei whakarite i ngā hiahia o ngā kaupapa. Ko te hanga e whakauruhia ana i ngā ara herehere pai e kitea ana i te mutunga o ngā tāwhiti tā, me te whakawaea i te tā i te wā e mahi ana. Ko ngā tā DTH hou e whakarite ana i ngā rauropi whakamutunga me ngā pora āhuarangi e whakapakari ana i te roa o te raumati. He pai noa rā kei te whenua iti rānei, kei te kohatu kaha, ka taea e ia te whakatika pai o ngā ratemana, ahakoa te whakatika pai o ngā rua tika. I whakarerekētia te hanga tā e te hunga whakamahi i te tuku kai, i te tāwai wai, i te hanga, me ngā kaupapa takoto, e whakamahia ana i te pai me te whakapono i waenganui i ngā momo whakamahi turetu.