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← TechnologyWhich outcome occurs inside a surface grinder when exceeding coolant flow limits?
A)Thermal cracking of the workpiece✓
B)Increased wheel wear and loading
C)Elevated spindle motor amperage
D)Reduced surface finish and waviness
💡 Explanation
Thermal cracking happens because exceeding coolant flow rate causes uneven cooling leading to localized thermal stresses; the **thermal shock** exceeds material strength, therefore cracks propagate, rather than uniform cooling which would prevent thermal build-up.
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