Patent Number: 6,309,149

Title: Twist drill for dry drilling

Abstract: A drill used for dry drilling, characterized by the asymmetry of those cutting edge parts only whose faces are in the drill core area, in particular its entire chisel edge. This asymmetry can result from the fact that the individual chisel edges have different lengths.

Inventors: Borschert; Bernhard (Nurnberg, DE), Seidel; Jurgen (Oberreichenbach, DE)

Assignee: Kennametal PC Inc.

International Classification: B23B 51/02 (20060101); B23B 051/02 ()

Expiration Date: 10/30/2018