E mōhiotia ana mō tōna mata tapahi roa rawa, kua hangaia te wiri DIN 1869 HSS mō te keri poka hohonu. He mea hanga tēnei wiri mai i te rauemi HSS kounga teitei (M35, M2, 4341) hei whakarite i te roa me te pumau o te mahi mō te wā roa. Nā te painga roa o te mata ka taea e ia te tino pai i roto i te keri poka hohonu, me te whakahaere ngāwari i ngā mahi keri uaua me te hohonu.
He mea hanga te wiri me te pito tapahi tere 135°, e kore e whakapai ake i te tika o te keri anake, engari ka whakaitihia hoki te "hīkoi" me te "nekehanga" o te mata wiri i te wā o te keri, kia maeneene ai, kia tika ai hoki te keri. He pai te āhua o te pito paerewa 118° mō te whānuitanga o ngā rauemi, ā, he whānui hoki ngā whakamahinga.
He pai te wiri mō ngā rauemi ngohengohe pērā i te konumohe, te rakau, me te kirihou, engari ka taea hoki te wiri pai i ngā rauemi mārō pērā i te maitai me te kowiri tira. Nā ō rātou pū huri tika, ngā awaawa me ngā rahi wiri, he whānui ngā whakamahinga o ngā wiri DIN 1869 i roto i ngā momo mahi ahumahi me te arumoni.
He maha ngā momo whakaotinga mata e wātea ana mō ngā wiri, e whakarei ake ana i te āhua o te wiri, me tōna ātete ki te waikura me te pakaru. Ka whakakotahihia e ēnei āhuatanga te ataahua me te whaihua, e āhei ai ngā mata wiri ki te pupuri i tā rātou mahi i roto i te whānuitanga o ngā taiao mahi.
Ko te whānui o ngā mahi a ngā mata keri e whakaatahia ana i roto i tō rātou pai mō te whānuitanga o ngā rauemi me ngā tono. He tino pai mō ngā tono e hiahia ana kia keri tika i ngā hohonutanga e kore e taea te uru atu, i ngā wāhi kuiti rānei. Ko tō rātou hoahoa roa rawa atu ehara i te mea ka whakapai ake i te kaha ki te keri i roto i ngā rauemi hohonu, engari ka māmā ake hoki te mahi i ngā koki me ngā tūranga motuhake. Ahakoa kei te tāuta koe i ngā paipa me ngā waea, kei te mahi rānei i ngā mahi hanga me ngā mahi hangarau uaua, ka tukuna e ngā keri DIN 1869 te mahi tino pai. Ka hangaia ngā keri DIN 1869 ki ngā paerewa whakahaere kounga tino pakari, kia mau tonu ai te mahi a ia keri i roto i ngā taiao uaua.
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