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← TechnologyWhich 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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