Ball dunƙula ne daidaito drive abubuwa, yadu ake amfani da su a CNC inji kayan aiki. Ball madaidaiciyar madaidaiciyar aiki ne mafi girma fiye da motsi madaidaiciyar, da aiki tsari ne a biyar matakai: pre-dumama aiki, roughing, rabin kammala aiki, kammala aiki da kuma karshe aiki matakai. Screw thread farfajiyar ƙunshi guda biyu arcs, a grinding ƙafafun gyara tare da musamman gyara lokacin. Don kawar da matsin lamba na ciki, shirya tsari na zafi sau hudu.