Txij nkawm uas kav hlaub taper twist laum
1, thaum drilling hlau, thov xyuas kom txaus txias tau thiab siv cov kua hlau txiav.
2, zoo laum hlau thiab rail clearances yuav ua kom cov cav laij laum thiab cov khoom ntawm lub neej
3, txav du thiab muab ntxuav ntawm lub sib nqus thiab workpiece.
4, thaum laum phaj, workpiece los siv tam, drilled workpiece loj loj, kom cov stability ntawm cov workpiece.
5, thaum pib lub drilling thiab hnub, pub tus nqi yuav tsum raug txo kom tsawg 1/3.