The size of a grinding machine is specified according to the size of the largest workpiece that can be mounted on the machine.
The cylindrical centre type grinding machine is specified by the diameter and length of the largest workpiece the machine can accommodate between centers.
The internal centre type grinder is specified by the diameter of workpiece that can be swung and the maximum length of the stroke of the grinding wheel.
The reciprocating table type surface grinders are specified by the table area and the maximum height of the grinding wheel from the table surface. The rotary table type surface grinder is specified by the diameter of the chuck or table. A tool and cutter grinder is specified further by the maximum size of tool that can be sharpened and dressed.