Difficulty: Easy
Correct Answer: Using a softer wheel or by decreasing the wheel speed
Explanation:
Introduction / Context:
Glazing of a grinding wheel occurs when abrasive grains become dull but are not shed by the bond. The wheel surface turns shiny, chip space clogs, forces rise, temperature increases, and the part may burn. This question tests corrective actions rooted in grinding wheel selection and cutting speed control.
Given Data / Assumptions:
Concept / Approach:
Abrasive self-sharpening relies on timely grain fracture or pull-out. If the wheel is too hard or the peripheral speed is too high, dull grains are held too strongly and continue rubbing. Selecting a softer grade promotes grain release; lowering wheel speed reduces rubbing and encourages renewed cutting.
Step-by-Step Solution:
Verification / Alternative check:
After switching to a softer wheel or reducing speed, the specific grinding energy drops, sparks become more active, and the surface finish improves without burn—evidence of restored cutting.
Why Other Options Are Wrong:
Common Pitfalls:
Confusing glazing with loading; loading is chip packing, fixed by dressing and coolant filtration, not merely wheel grade.
Final Answer:
Using a softer wheel or by decreasing the wheel speed
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