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Which risk increases significantly when high-speed tool steel lathes reach their critical temperature?

A)Thermal expansion exceeds tolerance limits.
B)Workpiece hardness greatly reduces.
C)Coolant vaporization decreases machining rates.
D)Spindle motor efficiency increases rapidly.

💡 Explanation

Increased temperature in high-speed steel lathes leads to thermal expansion because the coefficient of thermal expansion dictates dimensional change with temperature. Therefore, exceeding tolerance is the primary risk, rather than reduced hardness, as tempering requires much higher temperatures.

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