A STUDY OF THE BASIC MECHANICS OF THE CHISEL EDGE OF A TWIST DRILL
- 1 January 1970
- journal article
- research article
- Published by Taylor & Francis in International Journal of Production Research
- Vol. 8 (4) , 325-343
- https://doi.org/10.1080/00207547008929851
Abstract
A model of chip formation and an indentation model are constructed for the chisel edge region of a twist drill. From these models, predictions are made as to the shape of the wear zone about the chisel edge and equations derived for calculating the torque and thrust developed by the chisel edge given the geometry of the drill point, the cutting conditions and a shear stress factor for the work material. Using the chisel edge thrust equation, it is shown that as the drill feed tends to zero, the drill thrust approaches a finite value the magnitude of which is in reasonable agreement with that observed experimentally.Keywords
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