Grinder (grinding machine) is a machine tool that uses abrasive tools to grind the workpiece surface. Most grinders use high-speed rotating grinding wheels for grinding, and a few use abrasive belts and other abrasives and free abrasives, such as honing machines, superfinishing machines, abrasive belt grinders, grinders and polishing machines.

Grinding machine can process materials with high hardness, such as hardened steel, cemented carbide, etc; It can also process brittle materials, such as glass and granite. The grinder can perform grinding with high precision and small surface roughness, as well as high efficiency grinding, such as strong grinding.