Platon ifite ibikoresho byombi (ibyuma bitagira umwete) hamwe nibikoresho byo hejuru bya taper (Taper drill rods na Taper drill bits / Knock-off drill bits) kugirango uhitemo gucukura umwobo muto, cyane cyane kubitwara intoki. Ibi bikoresho byitwa kandi ibikoresho byo gucukura intoki. Gucukura hamwe nibikoresho nuburyo bwa kera bwo kuzenguruka-percussive uburyo bwo gucukura, kandi bifite uburyo bunini mugucukura amabuye y'agaciro, gucukura zahabu no kubaka nibindi.
Ikaze Kubaza
Aderesi imeri yawe ntizatangazwa. Imirima isabwa irangwa na *