When exact tolerances are required, which grinding approach is recommended?

• A. Cross grinding technique
• B. Grinding with coarse grit only
• C. Manual hand grinding only
• D. No grinding required

Answer: (A)

When exact tolerances are required, cross grinding is the best choice because it delivers the most accurate and repeatable dimensions. By moving the wheel across the work in multiple directions, this method averages out wheel wear and small deflections, reducing taper and diameter variation and improving flatness and squareness. The result is a more uniform surface finish with controlled stock removal, which is essential for tight tolerances.

Coarse grit alone would remove material quickly but leave a rough surface and less dimensional control. Manual hand grinding introduces a lot of variability and can't consistently hit very tight tolerances. And skipping grinding means you won’t achieve the precise size or finish required.