A spade drill insert and drilling tool assembly is provided wherein the lands of the spade drill insert have helical margins which provide increased stability during cutting operations. The margin may have a helical trailing side or leading side, a parallel helical margin, or may also include a gullet or flute adjacent the helical margin.
申请公布号
EP1682294(A4)
申请公布日期
2008.09.24
申请号
EP20040800830
申请日期
2004.11.05
申请人
ALLIED MACHINE & ENGINEERING CORP.
发明人
STOKEY, TIMOTHY, G.;FIEGL, GREG;NUZZI, JOSEPH, P.;MAST, WENDELL, E.