Which risk increases when a CNC milling machine's spindle exhibits excessive thermal expansion due to consistently exceeding its specified duty cycle?

💡 Explanation

Exceeding duty cycle causes overheating. The thermal expansion leads to decreased accuracy via the Abbe principle. The Abbe principle amplifies angular errors transforming these errors in linear errors. Therefore, dimensional tolerances will worsen, rather than causing a better surface finish or implying longer tool life under such stress.

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