What is a Grinding Wheel?

A grinding wheel, also called an abrasive disc, is a round tool made of sharp abrasive grains. These wheels come in various sizes and materials for different tasks. Each type fits specific grinding machines. Grinding wheels are designed to attach to a matching size angle grinder.

Grinding wheels have two main parts — cutting grains and a bonding agent. The agent holds the grains together and supports them during cutting.

Most grinding wheels use aluminum oxide grains. Brands differ in using filler grains or uniform grains. Uniform grains cut better and last longer. Wheels with filler grains may crack or leave uneven finishes.

The bonding agent affects the wheel’s performance. It determines how fast grains break off during use. This impacts the wheel’s cutting ability and lifespan. Softer bonds work well for hard materials, while harder bonds suit softer materials.