TY JOUR TI RELIABILITY INCREASE OF THREAD CUTTING WITH TAP BORERS IN SUPER-SMALL HOLES KW super-small diameter KW reliability KW thread cutting KW failure intensity JO Bulletin of Bryansk state technical university AU Kulikov, M.Y. AU Yagodkin, M.v. AU Kulikov, Y.M. PY 2020 IS 2020 PB Bryansk State Technical University