![]() As schematically shown here, a positive rake makes the tool tip comparatively thicker by increasing wedge angle. For better understanding of this classification, you may read: Concept of positive rake, negative rake and zero rake.Ī negative rake occurs when sum of the clearance angle and wedge angle of cutting tool is more than 90º (angles measured on orthogonal plane). ![]() Each has certain pros and cons relative to other. ![]() Based on the orientation of rake surface with respect to reference plane, rake angles (γ) can be divided into three groups-positive rake angle, negative rake angle and zero rake angle. Rake surface is basically chip flowing surface whereas, reference plane (π R) is a plane perpendicular to cutting velocity vector (V c) in machining. Rake angle of a cutting tool is defined as the angle of orientation of tool’s rake surface from the reference plane (and measured on some other plane).
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