Ngenxa yezimo zangempela zokumba, noma ukusebenza okungalungile kwe-drill bit, amaphethini wokugqoka avame ukwakhiwa.
Uma ingahlulelwa kusenesikhathi futhi igaywe kabusha ngaphambi kokuthi umjikelezo wayo wokuguga ufike, i-drill bit izosebenza kabi noma yehluleke ngaphambi kwesikhathi.
Qinisekisa ukuthi i-drill bit (ngaphandle kwamazinyo e-alloy) ayihlangene nendawo yensimbi
