Poloka Ana Kikoʻī

ʻO kahi hiʻohiʻona koʻikoʻi o nā poloka anakahi, ʻo ia ka hiki ke hoʻohui pū ʻia me ka liʻiliʻi o ka maopopo ʻole o ka dimensional. Hoʻohui ʻia nā poloka e kahi kaʻina hana paheʻe i kapa ʻia ʻo wringing, kahi e hoʻopili ai ko lākou mau ʻili ultra-flat. Hiki ke hoʻohana ʻia kahi helu liʻiliʻi o nā poloka anakahi e hana i nā lōʻihi pololei i loko o kahi ākea ākea. Ma ka hoʻohana ʻana i 3 mau poloka i ka manawa i lawe ʻia mai kahi set o 30 mau poloka, hiki i kekahi ke hana i kekahi o nā lōʻihi 1000 mai 3.000 a 3.999 mm ma nā ʻanuʻu 0.001 mm (a i ʻole 0.3000 a 0.3999 ʻīniha ma nā ʻanuʻu 0.0001 ʻīniha). Ua hana ʻia nā poloka anakahi i ka makahiki 1896 e ka mīkini Suedena ʻo Carl Edvard Johansson. Hoʻohana ʻia lākou ma ke ʻano he kuhikuhi no ka calibration o nā lako ana i hoʻohana ʻia ma nā hale hana mīkini, e like me nā micrometers, nā sine bars, nā calipers, a me nā dial indicators (ke hoʻohana ʻia i kahi hana nānā). ʻO nā poloka anakahi ke ʻano nui o ka standardization lōʻihi i hoʻohana ʻia e ka ʻoihana.