2. Isantya sokudubula: Xa isantya sokudubula sinyuka, amandla okudubula ayanda, kodwa xa izinga liphezulu kakhulu, umonakalo wentsimbi yentsimbi kunye nesanti yensimbi iyanda.
3. Ubungakanani beumatshini wokudubulaigrit yentsimbi: Okukhona udubulo lwentsimbi lusiba likhulu, kokukhona amandla ekinetic esivuthelo abe makhulu, kwaye kokukhona ukudutyulwa kunamandla. Ngoko ke, xa simisela ukudubula kwamandla okuqhuma, kufuneka sikhethe kuphela intsimbi encinci yentsimbi kunye negrit yensimbi, ukwenzela ukuba izinga lokucoca liya kwandiswa. Ubungakanani bokuqhunyiswa kokudubula bukwanqunyelwe yimilo yenxalenye. Xa kukho i-groove kwinqanaba, ububanzi bokudubula kwensimbi kunye nentsimbi yensimbi kufuneka ibe ngaphantsi kwesiqingatha se-radius yangaphakathi ye-groove.
4. I-angle yokubonisa: Xa i-jet ye-jet yentsimbi kunye nesanti yentsimbi i-perpendicular kwi-workpiece ukuze itshizwe, amandla okudubula kwentsimbi kunye nesanti yentsimbi alungile, kwaye ngokuqhelekileyo kufuneka agcinwe kule meko ukuze adubule. Ukuba kunqunyelwe ubume bamacandelo, xa kufuneka i-angle encinci iqhume ukuqhuma, ubungakanani kunye nesantya sokudubula kwentsimbi kunye negrit yensimbi kufuneka kwandiswe ngokufanelekileyo.