There are several types of grinding machines classified based on their construction and purpose, including rough grinders and precision grinders, floor stand and bench grinders, portable and flexible shaft grinders, swing frame grinders, abrasive belt grinders, cylindrical grinders, surface grinders, tool & cutter grinders, and special grinders. Common grinding machines are bench & pedestal grinders, portable or flexible shaft grinders, swing frame grinders, external and internal cylindrical grinders, surface grinders, and universal tool and cutter grinders.