Fakitale yobowola zitsime IADC126 mainchesi 17 1/2 (444.5mm)

Zidutswa za tricone za Mill toothChomwe chimatchedwanso kuti ma cone bits achitsulo), chimapangidwa ndi zinthu zolimba kwambiri kuchokera kwa opanga ma tricone cone bit. Sitingoyesa kukweza kukana kwa mano, komanso timawongolera bwino momwe mano amachekerera komanso mtunda wotsetsereka wa bowola. Tsopano, chowonjezerachi chingagwiritsidwe ntchito bwino muukadaulo wamakono wobowola, womwe sungangochepetsa mwayi wosweka kwa mano, komanso kukonza bwino dongosolo la mano ndi kuchuluka kwa mano, ndikugwiritsa ntchito mokwanira ntchito ya kugaya mano.

Pakupanga bit cone, imagwiritsa ntchito inner hole welded antifriction alloy, yomwe imatha kukonza mphamvu ya bearing kuluma mpaka pamlingo winawake, komanso imayikidwa kuti ichepetse kusiyana kwa kuthamanga ndikuletsa matope kulowa mu system yopaka mafuta. Chipangizo chotseka rabara. Mphamvu ndi nthawi yogwirira ntchito ya seal lubrication system ya drill bit zitha kukonzedwa bwino kwambiri.