Moolelo o na alakai Linear

ʻOiai ke ʻike ʻia nei nā huila huila laina i ko lākou kumu hoʻi i ka wā kahiko, ʻaʻole lākou i maʻalahi i ka hoʻohana maʻamau ma ke ʻano he mechanical element a hiki i ka hoʻomaka ʻana o ke kenekulia 20, i ka wā i hoʻohana ʻia ai kēlā mau mea ʻōwili i nā pōpō kila no kā lākou neʻe laina pololei a maʻalahi. ua maʻalahi ka hoʻohana ʻana i nā mīkini pololei.
ʻO ka mīkini kumu o ka mea ʻōwililaina neʻe lainaUa hoʻokumu ʻia i ka makahiki 1946 i ka wā i kūʻai ʻia ai kahi hui ʻAmelika, ʻo Thomson, i nā ʻōpala pōleʻa (he ʻano pōlele hou). Hiki ke ʻike ʻia ke kumu o nā alakaʻi laina o kēia lā (nā ʻāpana ʻōwili me nā kaʻa) ma kahi patent i hāʻawi ʻia ma Farani i ka makahiki 1932. ʻO kēia patent, ʻoiai e hoʻopili ana i nā hana koʻikoʻi āpau o nā alakaʻi laina, pono mau e kali no nā makahiki he mau makahiki ma mua o kā lākou noi noi ma ka mākeke. I loko o ia manawa, ua kūʻai kūʻai ʻia kekahi mau ʻāpana mīkini e hoʻohana ana i nā mea ʻōwili e like me nā pōpō pōlele a i ʻole nā ​​splines. Ua lawe ʻia mai i ka mākeke nā ʻano ʻano like ʻole o nā puʻupuʻu pōleʻa (linear ball bearings), me nā bearings ʻano hāmama. I kēia manawa, nui nā mea i hana ʻia a me nā hoʻomaikaʻi o nā ʻano like i hana ʻia i kaalakai laina.