Abstract
Deficiencies in the definitions of some of the angles in the ISO on Cutting Tool Geometry have been noted and new definitions are proposed. It is shown that some of the trigonometrical relationships interrelating the various angles derived for the acute tool cutting edge angle do not apply when the tool cutting edge angle is greater than 90°, as can occur with certain cutting tools. A consistent set of relationships is presented for the total range of the cutting edge angle. Relationships are presented for the various angles on the cutting lip and chisel edge of a twist drill and the effects of radius and feed on the various parameters are shown diagrammatically.
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