Why is grinding considered one of the most accurate machining processes?

Grinding is considered the most accurate of all basic machining processes because it is capable of achieving extremely tight dimensional tolerances, often within plus or minus 0.0001 inch (0.0025 millimetre).1

This high level of precision is made possible by the use of a rotating grinding wheel composed of abrasive granules. These wheels are designed to be self-sharpening; as the wheel operates, dull grains break away to expose fresh, sharp cutting edges, ensuring consistent performance. Because grinding can effectively remove material from both hard and soft parts, it is essential for applications requiring specific surface finishes, roundness, and precise fits, such as those found in the automotive industry for engine components.23

Furthermore, the ability to dress the wheel—shaping its edges with a diamond or other tool—allows for the creation of complex geometries with high accuracy, making it a critical process for manufacturing parts that require exacting standards.32