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Article: "No-point" drill reduces thrust.
- Article from:
- Tooling & Production
- Article date:
- April 1, 1989
- Author:
CopyrightCOPYRIGHT 1989 Nelson Publishing. This material is published under license from the publisher through the Gale Group, Farmington Hills, Michigan. All inquiries regarding rights should be directed to the Gale Group. (Hide copyright information)
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"No-point" drill reduces thrust
The twist drill is one of the most widely used, yet most complex, of all cutting tools. There are many factors that influence drill performance, including both the drill and workpiece materials as well as the drill point shape. The drill point is the most critical part of the drill and small variations in its geometry or symmetry can have a strong influence on its performance.
Many variations of drill geometry have been proposed in order to reduce cutting forces induced and to improve tool life of the drill. For example, point thinning methods, that provide a greater clearance near the corners of the chisel edge, were ...