Ngā mahi ārai i te pakaru o ngā tīwiri keri-ā-ake
He maha ngā wā ka pakaru te potae whati, te hiku whati, te tokotoko whati i roto i te tīwiri keri-ā-ringa waro martensitic, ka eke te tīwiri keri-ā-ringa waro martensitic ki te ≥560HV te pakeke o te mata o te mata waro-itriding pāmahana teitei, me te kaha o te urunga, engari ka piki ake te pakarukaru o te tīwiri. Ina nui rawa te kawenga o te tīwiri keri-ā-ringa, ka nui rawa te taipana, ka ngawari te wiri ka puta he pakarukaru. Ina pakaru te keri-ā-ringa, ehara i te mea ka pā ki te ahunga whakamua o te hanganga, ehara i te mea ataahua, engari ka puta mai hoki he raupapa o ngā tūponotanga haumaru. Ko ngā āhuatanga matua hei ārai i te pakaru o te tīwiri keri:
1: Kōwhiria te hua tika
a: I mua i te whakamahinga, whakaūhia mēnā ka taea e ngā āhuatanga miihini o te hua te whakatutuki i ngā whakaritenga o te whakamahinga
b: He kōwhiringa whaitake o te rahi me te roa o te tīwiri
C: E taunakihia ana kia whakamahia he hua niho haurua, he hua niho rua rānei i roto i te taiao paparanga-rua
2: Whakamahia te tau
A: Whakamahia kia 4-6 ngā tīwiri mō ia mita pūrua
B: Me whakanui ake te maha o ngā tuanui me ngā pereti taumaha kia tika ai
C: He nui ake te rohe hau, he tika te whakanui ake i te horopeta
3: Tikanga whakamahi tika
A: Patohia kia poutū ki te tuaka o te miro, kaua e whakatītaha
B: I roto i te tukanga whakakīkī, me ōrite te kaha, ā, kaua te taipana whakakīkī e neke ake i te taipana haumaru
C: 12#, 14# ngā hua whakatakotoranga, te tere o te wiri hiko 1000-1800 hurihuri kāore e taea te tere rawa
4: Te taipana rahunga (kei raro nei ngā raraunga hei tohutoro anake) waeine:Nm
| ngā whakaritenga | Whakangaromia te iti rawa o te taipana |
| 4# | 1.5 |
| 6# | 2.8 |
| 8# | 4.7 |
| 10# | 6.9 |
| 12# | 10.4 |
| 14# | 16.9 |