Umutobe wo gushyiramo icyuma gipima hejuru cya 25mm gishobora gukoreshwa mu nganda

1. Ibyuma bizimya kandi bikomera, bifite ubukana bwinshi, Gukoresha icyuma cyihariye cya H13 gifite ubukana bwinshi, nyuma yo kuzimya, gusya no gusya, bituma imashini ya U drill igira ingano nyinshi ya karuboni na vanadium, bigatuma irushaho kudashira no gukomera.

2. Imbaraga ziringaniye, zihamye kandi zikora neza, binyuze mu gukwirakwiza neza aho inkombe yo hagati n'inkombe yo ku ruhande rw'inyuma, ubushobozi bwo gucukura bwa U-drill burarushaho kuba bwiza.

3. Amazi asohoka mu mwobo w'imbere, kugenzura ubushyuhe neza, Sisitemu yo gukonjesha imbere ya helix ebyiri ishobora gukonjesha ubushyuhe neza, kugira ngo igikoresho cya U gisohoke neza kandi gikore neza.