Ko ngā porotiti whakapai kaha he taputapu tūturu, he taputapu hahau hoki e whakaritea ana kia neke i te taraweti me te whakarite i te mata i ngā tono mīhini. Ko te kounga o ēnei taputapu e āhu mai ana i ētahi āhu matua: ngā taputapu whakarewa kaha, te wehenga ōrite o ngā karu, te kaha here, me te hanga kaha. Ko ngā karu whakarewa, ko te rongonui hiriwa (mō ngā metara whānui), zirconia alumina (mō ngā uhi pani), te karaiti hiriwa rānei (mō ngā metara kore-tirona pērā i te wātā), kua whiriwhiria mō te kaha me te kautū o ēnei, ka tāwhai ai i te kaha o te whakapapa tere ake anō hoki i ngā metara pakaru rānei. Kei te wehe tōrau ngā karu ki te mata o te porotiti, kia kaua ai ngā waahi kāore i te ōrite e āwhina ana ki te whakapapa rānei i te taraweti o te wāhanga. Ko te kaihere, ina he resin ranei e kaukume ai te wera, rānei he auta, e mau tōna kaha ana ki te karetia i te wareware me te wera e hua ana i te wā o te whakapapa tere. Ko tēnei hononga kaha e muru ai i te ngaro o ngā karu, e roa ai te ora o te porotiti, e iti ai hoki te raru o ngā parakete e manawa ana—ko tēnei he ārai nui. Ko te keel o te porotiti, e hangaia ana nō ngā whīwana whakakaha, e whakaae ana i te whiti me te tōtika, e āki ai ia kia taea ai te kaha o ngā kōpae (e noho tata ana ki ngā kōpae kinkoti) kia kaua ai te māmā, te pakaru rānei. Ko ngā porotiti whakapai kaha e pai ana mō ngā mahi penei i te neke i ngā rāranga tahumaero, te whakakeke i ngā uhi, te whakapaku i te pipi rānei, me te whakapapa i ngā wāhanga metara. Kua whakamahia whānui ēnei i ngā umanga penei i te tika i ngā waka, te hanga metara, te hanga whare, me te whakaputa, kei reira ko te tūpono me te ōrite he mea nui. Ko te whakapaku tere o te taraweti e iti ai te wā e whakaputangia ai, ā, ko te roa o te porotiti e iti ai te utu whakakapi i te wā. He maha anō ngā porotiti kaha o te kounga e whai ārai haumaru hoki, pērā i ngā hoahoa anti-kickback, i ngā tapa whakakaha rānei, e iti ai te raru o ngā hinganga i te wā o te whakamahinga. Ahakoa kei te whakamahi i ngā tohunga, kei te hunga DIY hoki, e tuku mai ana ēnei porotiti i ngā putanga tūturu, i te mahi kaha, nō reira he taputapu whakapono hei whakatutuki i ngā uaua o te whakapapa metara.
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Kei te whai take ake a Dongtai ki te tu tonu i te rāwhiti me te whakamahere mō te whakatipu o te horopaki matapou-taonga ā-ao.
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