CONFIGURATION OF DRILL

CONFIGURATION OF DRILL

PURPOSE:To prevent break of a drill, cracks on basic material and adhesion of fused resin on the face of a drilled hole, by making the depth of a groove on the drill at the end of said groove more than 50% of the radius of the drill, thus decreasing the cutting resistance of the drill. CONSTITUTION:...

Ausführliche Beschreibung

Gespeichert in:
Bibliographische Detailangaben
Hauptverfasser: TAIKO YOICHI, TERABAYASHI TAKAO, SHIMAZAKI TAKESHI
Format: Patent
Sprache:eng
Schlagworte:
BORING
MACHINE TOOLS
METAL-WORKING NOT OTHERWISE PROVIDED FOR
PERFORMING OPERATIONS
TRANSPORTING
TURNING
Online-Zugang:Volltext bestellen
Tags: Tag hinzufügen
Keine Tags, Fügen Sie den ersten Tag hinzu!
Beschreibung
Zusammenfassung:PURPOSE:To prevent break of a drill, cracks on basic material and adhesion of fused resin on the face of a drilled hole, by making the depth of a groove on the drill at the end of said groove more than 50% of the radius of the drill, thus decreasing the cutting resistance of the drill. CONSTITUTION:In a drill 1 with its radius less than 0.5mm., its angle of twist is set to 26 deg. or more, the depth 6 of groove 5 on the drill is set to 70-80% of the radius of drill at tip 2 of the drill and to 50-80% thereof at the root end 3 of the groove. Further, the depth of groove 5 at its root end 3 is set to 50% or more of the radius of drill or more and to about 70% thereof at tip 2 of the drill. About 80% thereof is the upper limit.