Lapho uthenga izisekelo zesikhunta, ngokuvamile zihlukaniswa zibe izinhlobo ezimbili: izisekelo zesikhunta ezijwayelekile nezisekelo zesikhunta ezingajwayelekile. Singaqonda kalula ukuthi izisekelo zesikhunta ezijwayelekile zivamile futhi zinezinga eliphezulu lokumiswa, kuyilapho izisekelo zesikhunta ezingajwayelekile zenziwe ngokwezifiso, ezenzelwe ngokukhethekile ukukhiqizwa kwesikhunta okuhlukile.
Imishini ejwayelekile yokucubungula isisekelo sesikhunta ikakhulukazi umshini wokugaya, umshini wokugaya nomshini wokumba. Umshini wokugaya kanye nenqubo yokugaya izindawo ezi-6 ezikhanyayo ngosayizi oshiwo. Umshini wokubhoboza uzobhoboza izimbobo kusisekelo sesikhunta ngezidingo ezinembayo eziphansi, njengezimbobo zesikulufu, ukuphakamisa izimbobo zamandandatho kanye nokuthepha. Imfuneko eyisisekelo kakhulu yesisekelo sesikhunta esijwayelekile ukuvula isikhunta kahle. Ukuthi ukuvuleka kwesikhunta kubushelelezi noma cha kuhlobene ngokuqondile nokunemba kwezimbobo ezine zezinsika eziqondisayo. Ngakho-ke, ngokuvamile kuyadingeka ukusebenzisa isikhungo semishini esime mpo se-CNC ukuze ubhole ngokushesha bese kuba nesicefe ukuze ufeze ukunemba.
Isisekelo sesikhunta esingajwayelekile esokuqeda ukukhanda ngesisekelo sesisekelo sesikhunta esisezingeni elingenhla. Isiphetho esishiwo lapha sisho imbobo yesikhunta (uhlaka lwesikhunta), ukuma okuhle, imojula yokukhiya, indlela yamanzi (umzila wamanzi okushisa/okupholisa), imbobo ye-thimble, njll. edingwa elinye iqoqo lesikhunta ngaphandle kwezimbobo ezine zezinsika zomhlahlandlela. Ngakho-ke, umkhiqizi wesikhunta angafaka ngokuqondile umongo wesikhunta ocutshunguliwe (umgogodla wesikhunta), bese wenza isilingo sesikhunta kanye nokukhiqizwa komkhiqizo wepulasitiki.
