Yuav ua li cas laum no conical qhov ntawm MS & SS phaj? Peb muaj peb kauj ruam, peb xaiv peb qhov tshwj xeeb drilling me ntsis rau laum lub phaj, qhov siab tshaj plaws tuaj yeem yog 20mm thickness. Piv txwv li, thaum peb laum ib phaj nrog 20mm thickness, thawj peb siv nruab nrab loj drilling me ntsis rau qhov tob ntawm 18mm, ces siv me me drilling me ntsis rau laum lub xeem 2 hli phaj, thaum kawg siv loj loj drilling me ntsis kom lub sab saum toj qhov loj. mus txog qhov tob ntawm 10mm. Tau kawg lub phaj tuab yog raws li cov neeg siv khoom xav tau, peb siv cov khoom siv drilling me ntsis, uas tuaj yeem pom nyob rau hauv Tuam Tshoj ua lag luam tsis tshua muaj, yog vim li cas peb tuaj yeem ua lub qhov conical rau peb cov neeg siv khoom.