THREE-BLADE DRILL

PROBLEM TO BE SOLVED: To secure high rigidity and excellent chip dischargeability, by devising a cross-sectional shape of a helical groove, on a three-blade drill.SOLUTION: In the three-blade drill, a helical groove 3 has a first curved surface 3a of a radius r1 of curvature and a second curved surf...

Ausführliche Beschreibung

Bibliographische Detailangaben

Hauptverfasser:	KAMISHIRO MASAAKI, MEGURO KIICHI, KURITSUKA KAZUMASA
Format:	Patent
Sprache:	eng
Schlagworte:	BORING MACHINE TOOLS METAL-WORKING NOT OTHERWISE PROVIDED FOR PERFORMING OPERATIONS TRANSPORTING TURNING
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