Which outcome occurs during lathe cutting when exceeding critical rake angle?

A)Chatter increases workpiece surface roughness✓

B)Material tensile strength increases rapidly

C)Elastic deformation improves cutting edge

D)Thermal conductivity reduces tool wear

💡 Explanation

Exceeding the critical rake angle during turning promotes self-excited vibrations, because it significantly reduces the effective shear angle and increases cutting forces, thereby initiating chatter; therefore, surface finish degrades, rather than any metallurgical change or improved tool life occurring.

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Which outcome occurs during lathe cutting when exceeding critical rake angle?

💡 Explanation

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