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Cutting mechanics classification: drilling as a cutting operation Drilling with a twist drill is classified under which cutting mode? Choose the correct option.

Difficulty: Easy

Orthogonal cutting
Oblique cutting
Simple cutting
Uniform cutting

Correct Answer: Oblique cutting

Explanation:

Concept
Orthogonal cutting assumes a straight cutting edge perpendicular to cutting velocity. Drilling uses a helical cutting edge with inclination; chip flow is not in a plane normal to the cutting edge → it is oblique cutting.

Final Answer
Oblique cutting.

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