pā kōwhiti diamona polikarihana
Nā ngā pūtē PDC (Polycrystalline Diamond Compact) te whakamana i tētahi whaihanga hou rawa atu i te hunga whakamahere pūnaha, e kake ana i te whiuwhiutanga me te āhuatanga o te kōpikirina. E ai ki ēnei rautaki matataki, nā ngā kākano diamona e hangaia nei te matataki, ka whakapiki ki runga i ngā papa tungsten carbide, whakauruhia mai i te mahi metallurgical, hei hanga i tētahi mata matataki e mohio ana ki te korenga me te kawe iho i te wehi. Hei tirohanga mō ngā pūtē, he maha ngā matataki PDC e takoto nei i waenganui i te kanohi o te pūtē, e āhei ana ki te kawe i te tahuri pai o te kōpikirina o ngā papa, mā te mahi kōpikirina kauhau. Ka whakaritea tēnei hanganga hei whiwhi wā moe e taka ana, me te oranga ake o te pūtē i runga i ngā pūtē rola koni matua. E pai ana ngā pūtē PDC ki te kōpikirina i waenganui i ngā momo whenua, mai i ngā papa māku ki ngā papa porowhita iti, me te whakamahere i te mamae me te kaihau. Kei roto i ngā pūtē, he hanganga hīrau matataki pai noa iho, e whakamanawaroa ana i te whakapai me te whakawehenga i te hanga matataki, kia kaua e kitea te pūtē kōpikirina, me te whakamana i te pai o te mahi. Nō ngā pūtē PDC o nāianei, he hanganga rite ā-pūnaha e whakapai ana i te whakahoki āhuatanga me te pūmau i te wā o te kōpikirina, ka whakaiti i te whiuwhiū me te whakapai i te paihere katoa o te mahi kōpikirina.