Ƙarfe, wanda kuma aka sani da juyawa ko kadi, tsari ne na aikin ƙarfe wanda ya ƙunshi jujjuya diski na ƙarfe ko bututu akan lathe yayin da ake matsa lamba tare da kayan aiki don siffanta shi zuwa sigar da ake so.Ana amfani da tsarin da yawa don ƙirƙirar sifofi na cylindrical ko conical kamar kwanuka, vases, da fitilu, da hadaddun geometries kamar hemispheres da paraboloids.
A lokacin jujjuyawar ƙarfe, diski ko bututun ƙarfe ana manne shi akan lathe kuma ana juyawa cikin sauri.Wani kayan aiki, wanda ake kira spinner, sai a danna shi a kan karfe, yana sa shi ya kwarara kuma ya dauki siffar kayan aiki.Za a iya yin jujjuyawar ta hannu ko kuma a ɗora shi akan lathe.Ana maimaita tsari sau da yawa, tare da sifar a hankali ana tsaftace shi tare da kowane wucewa har sai an sami nau'i na ƙarshe.
Ana iya yin jujjuyawar ƙarfe ta amfani da ƙarfe da yawa, gami da aluminum, jan ƙarfe, tagulla, bakin karfe, da titanium.Ana yawan amfani da shi wajen kera abubuwan da suka shafi sararin samaniya, kera motoci, da masana'antar hasken wuta, haka kuma don dalilai na ado da fasaha.