The negative rake is usually provided on

Explanation:

For stability of cutting edge negative rake angle is provided on the cemented carbide tool.

Positive rake – helps reduce cutting force and thus cutting power requirement.

Negative rake – to increase edge-strength and life of the tool

Zero rake – to simplify the design and manufacture of the form tools

Negative back rake angle is preferable for a carbide tool. Carbide tools are very brittle in nature, so deformation occurs if we provide a positive back rake angle.

Positive back rake angle is used for machining low tensile strength and non-ferrous materials. Negative back rake angles are used for machining high tensile strength material, heavy feed, and interrupted cuts.