On a CNC lathe turning hardened steel, which outcome occurs when the rotational speed exceeds the tool's rake angle capacity?

💡 Explanation

Exceeding the speed induces regenerative chatter because the cutting force variations excite natural frequencies, amplifying vibration. Therefore the machined surface will exhibit chatter oscillation rather than workpiece annealing which could occur from too low speed, or hydrodynamic lubrication which is somewhat speed dependent in conventional terms.

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