How did artificial abrasives lead to the development of grinding machines?

The development of grinding machines as a distinct field of machine tools was directly enabled by the production of artificial abrasives in the late 19th century.1

Prior to this, industry relied on natural abrasives like emery, corundum, and garnet, which eventually fell short of the demands for precision and efficiency in manufacturing. The invention of methods to produce silicon carbide and alumina provided superior, consistent materials that could be engineered into high-performance grinding wheels.23

These artificial abrasives allowed for the creation of self-sharpening wheels capable of operating at higher speeds and handling harder materials than previously possible. The transformative potential of this technology was famously illustrated by C.H. Norton, who developed a grinding machine that could process an automobile crankshaft in 15 minutes—a task that had previously required five hours. Consequently, the availability of these manufactured abrasives shifted grinding from a specialized finishing process to a fundamental industrial tool capable of achieving high rates of production and extreme dimensional accuracy.2431