tōpū heke ngū
Kei te whai take te pūtahi kōriki hei whakamahere i tētahi āhuatanga nui i ngā mahi kōriki o nāianei, ka noho he tira nui ki te whakawehenga me te whakapakoko i ngā whenua rerekē. Ko tēnei wāhi hangarau e hīkina nei i ngā mātauranga matatika me ngā rara moana hei whakamaru i te huarahi pai rawa mō te kōrika i ngā wāhi pūtauwhenua. Hei tūtohunga i ngā whatunga o te pūtahi, e ai ki te tikanga, ko ngā rara tungsten carbide rānei ko ngā rara whakangāwari pūmanawa, kua whakatakoto haumaru ki te whakapai i te haurite kōrika me te whakamana i te whakauru whenua i te wā o te mahi. E mahi ana ngā whatunga i runga i ngā rara herekore e tango atu ana i ngā kereka me te whakarotoro i te mata kōrika, hei whakatutuki i te mahi mutunga kore ki te kore e painga i te haurite. Kei te hanga i te pūtahi kōrika ngā huatau rerekē me ngā patipati kia taea te whakahaere i ngā whenua rerekē, mai i ngā rāhui papatūānuku ngenenge ki ngā rāhui igneous nui. Kei ngā pūtahi kōrika hou ka whakauru ngā tohu mōhiohia hei whakamohio i ngā tuhinga kōrika, ina whakaatu i te werawera, te pāpori, me te rahinga whiritoi, hei whakamana i te haurite me te whakahē i te wharekura. Ko te mōhiohere o ngā pūtahi kōrika kei te whai wāhi mō ngā momo mahi rerekē, ina whakaaetia te kōrika whakamōhio, te kōrika pūaro, me te whakapakoko ruaheke, me te whakamahi pai i a ia i ngā mahi kōriki i runga me i raro i te whenua.
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