Grinding wheels: The process of restoring sharp cutting action by removing dulled grains and bond is called…

Introduction / Context:
Grinding wheel maintenance involves two distinct operations: dressing and truing. Confusing these can lead to poor surface finish, high grinding forces, and thermal damage to the workpiece. This question focuses on the operation that renews the wheel's cutting ability.

Given Data / Assumptions:

• Dressed with diamond dresser, rotary dresser, or stick stones depending on bond.
• Wheel has become glazed or loaded with chips.
• Geometry (runout) is still acceptable or will be corrected separately if needed.

Concept / Approach:
Dressing removes dulled abrasive grains and bond to expose fresh, sharp cutting edges and open up the wheel structure. Truing is the geometric correction of the wheel to make it run true (corrects eccentricity and shape). Often both are done in sequence: true first, then dress, but the purposes remain different.

Step-by-Step Solution:

Verification / Alternative check:
Wheel manufacturer recommendations clearly separate truing (geometry) from dressing (sharpness/porosity restoration).

Why Other Options Are Wrong:

• Truing: corrects shape/runout, not primarily cutting action.
• Facing/clearing/loading: nonstandard or incorrect terms in this context.

Common Pitfalls:
Attempting to improve cutting by only truing; failing to redress leads to burn and chatter; over-dressing wastes wheel life.

Final Answer:
dressing