I-three-coordinate, ebizwa nangokuthi ubukhulu, ingumshini wokulinganisa ukunemba, obizwa ngokuthi i-CMM. Iyithuluzi lokulinganisa ukunemba eliphumelelayo elasungulwa ngawo-1960. Lavela ngenxa yomshini wokusebenza kahle kakhulu wamathuluzi omshini ozenzakalelayo namathuluzi omshini we-CNC, kanye nesidingo semishini yokulinganisa esheshayo nethembekile yokucubungula izingxenye ezibunjwe ngendlela eyinkimbinkimbi kakhulu.

Njengamanje, ukulinganisa okunezinhlangothi ezintathu kuye kwasetshenziswa kabanzi ezimbonini ezahlukene ezifana nokukhiqiza imishini, imboni yezimoto, imboni ye-elekthronikhi, imboni yezindiza, njll., futhi sekuyinto ebaluleke kakhulu yokulinganisa ngokunemba okuphezulu kokuhlolwa kwezimboni zanamuhla kanye nokulawulwa kwekhwalithi. Kuma-gage ethu akhethekile angewona ajwayelekile, ukulinganisa okunezinhlangothi ezintathu kuyimishini yokuhlola ebaluleke kakhulu. Ngemva kokuthola imidwebo yomkhiqizo wekhasimende futhi sakha uhlelo lwe-gage oluhlangabezana nezidingo ezifanele zomkhiqizo futhi ikhasimende lanelisekile, kuyadingeka. Qala izinyathelo zokucubungula esigabeni esilandelayo, bese sidinga ukusebenzisa ukulinganisa kwethu okunezinhlangothi ezintathu, ngoba ukunemba kwedivayisi ngokwayo kuphakeme kakhulu, ngakho-ke siyisebenzisele ukuhlola ukunemba kwengxenye ngayinye ye-gage yethu, ngoba i-gage ngokwayo iqinisekisa ukunemba kwamathuluzi ethu okuhlola. Isibonelo, indawo ethile ye-gage, ukuthamba kanye nephrofayili yayo kufaka phakathi izingxenye ezithile zemoto. Sonke singathola usayizi wangempela ngokuthola ukulinganisa okunezinhlangothi.