Discussion
A grinding ratio of 200 implies that the
Answer: B
A grinding ratio of 200 means the grinding wheel wears 0.005 times the volume of the material removed.
The grinding ratio (G-ratio) is the volume of work material removed divided by the volume of wheel worn away. A G-ratio of 200 means 200 units of material are removed for each unit of wheel wear, so the wheel wear is 1/200 = 0.005 of the material removed.
The first option inverts the ratio. The grinding ratio is about volumes removed and worn, not about the shape (aspect ratio) of the abrasive grains or the volume share of abrasive in the wheel.
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