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Which risk increases when machining a batch of tight-tolerance parts on a CNC lathe using flood coolant cycling between 20°C and 30°C?

A)Tool wear accelerates predictably.
B)Bacterial growth in coolant decreases.
C)Thermal expansion causes dimension variation.
D)Surface finish improves consistently.

💡 Explanation

Thermal expansion causes dimension variation, due to expansion and contraction of the metals because the coefficient of thermal expansion is non-negligible in high-precision applications; therefore parts deviate from specified dimensions, rather than tool wear, bacterial issues, better finishing happening.

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