RESEARCH PAPERS: Papers on Production Engineering

Drill Point Geometry and Optimization

[+] Author and Article Information
S. Kaldor, E. Lenz

Material Processing and Machine Tool Center, Technion-Israel Institute of Technology, Haifa, Israel

J. Eng. Ind 104(1), 84-90 (Feb 01, 1982) (7 pages) doi:10.1115/1.3185803 History: Received July 06, 1981; Online July 30, 2009


The geometrical parameters of the drill point, i.e., relief angles, chisel form, web size, and errors of symmetry have a major influence on drill performance. This paper deals with geometrical aspects of the drill point and with the development of fundamental mathematical definitions for the design of improved drill point grinders. A drill point grinder was built and a set of drills was ground and tested to find the optimum clearance angle. When compared with the standard commercial point, the new point with the optimum clearance angle gave an increase in tool life by more than a factor of two.

Copyright © 1982 by ASME
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