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Which risk increases when bearing tolerances tighten excessively in high-speed CNC machining?

A)Lubricant film starvation occurs
B)Increased tool chatter develops
C)Thermal expansion mismatch rises
D)Surface finish improves drastically

💡 Explanation

Lubricant film starvation increases because excessive bearing preload amplifies friction, therefore decreasing lubricant effectiveness rather than improving machining or surface quality as the bearing heats via friction via the excessive radial compressive force.

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