Dressing a grinding wheel is defined as

Dressing the wheel refers to removing the current layer of abrasive, so that a fresh and sharp surface is exposed to the work surface. Trueing the wheel makes the grinding surface parallel to the grinding table or other reference plane, so that the entire grinding wheel is even and produces an accurate surface.

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answer; niosh, the national institute for occupational safety and health;

answerup to (3) three years;