1. Tuatahi, tirohia te koki o te miro
Ko te tikanga tino tika ko te ine me te ine miro. Ko te 60° mō te paerewa o Amerika, ā, ko te 55° mō te paerewa o Peretānia.
Mena kāore he taputapu e wātea ana, mō ngā miro paipa, ka taea e koe te tirotiro i te tikanga hiri: Ko ngā miro NPT paerewa o Amerika ka hiritia mā te whakawhāiti o te miro tonu; ko ngā miro BSP paerewa o Peretānia (pērā i te BSPT, BSPP) he 55° te koki miro, ā, me whakawhirinaki ngā miro BSPP whakarara ki te mowhiti hiri mō te hiri.
2. Ngā tawhā tirotiro matua (ngā inenga me te TPI)
Mō ngā whakapiripiri pēnei i ngā pūtu me ngā nati he hononga miro, whai muri i te ine i te diameter matua (diameter o waho o te miro o waho / diameter o roto o te miro o roto), ko te mea tino nui ko te tatau i te maha o ngā miro ia inihi (TPI), kātahi ka tirohia ki te pukapuka ā-ringa paerewa.
Mō ngā miro paipa, hei tāpiritanga ki te ine i ngā inenga, me whakatau anō hoki mēnā he miro whāiti (pēnei i te NPT, BSPT) he miro tika rānei (pēnei i te BSPP), me te tikanga hiri anō hoki.
3. Tirohia tika te waehere paerewa
Mena he tohu paerewa kei te wāhanga (pēnei i te UNC, UNF, BSW, BSF, NPT, BSPP, me ētahi atu), koinei te pūtake pono rawa atu.
Whakahokia ki te pūtake
I ahu mai te miro paerewa o Peretānia i te miro Whitworth 55-tohu a Joseph Whitworth i te tau 1841;
I whakaarohia te miro paerewa Amerika e William Sellers i te tau 1864 hei miro 60-tohu.
Ina hoki, i te Pakanga Tuarua o te Ao, i puta he uauatanga nui i waenga i ngā paerewa o Peretānia me Amerika mō te whakawhitiwhiti taputapu i waenga i ngā ope taua o te Kotahitanga. Nō reira, i te tau 1948, i whakawhanakehia ngātahitia e te Hononga o Amerika, te Hononga o Ingarangi, me Kānata he paerewa miro kotahi (UNC/UNF).
He mea whakamīharo, mai i te tau 1961, i tangohia e ngā whakahaere o te ao te paerewa miro o Peretānia, arā, te ISO R 228. Nō reira, kua whakamahia whānuitia te miro o Peretānia puta noa i te ao.
Te wā tuku: Hui-tanguru-05-2026
