Discussion
The grinding wheel used to provide the best surface finish is
Answer: D
The best surface finish comes from A80L5V.
In the standard marking, A is the abrasive (aluminium oxide), the number is the grain size, L the grade (hardness), 5 the structure and V the vitrified bond. The four wheels differ only in grain size. A higher grain number means a finer mesh and smaller abrasive grains, which cut shallower scratches and give a smoother surface.
Grain sizes 36, 54 and 60 are coarser than 80 and suit faster stock removal rather than fine finishing, so 80 gives the best finish of the four.
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