A combined grinding machine is a machine tool that is used to perform multiple grinding operations on a single workpiece. It is typically used in manufacturing and metalworking industries to produce precise and accurate parts and components.

Combined grinding machines are equipped with multiple grinding heads or spindles, which can be used to grind different surfaces or features of a workpiece simultaneously. They may also have multiple workholding devices, such as chucks or fixtures, which allow them to hold and rotate the workpiece as it is being ground.

There are several types of combined grinding machines available, including surface grinding machines, cylindrical grinding machines, and centerless grinding machines. These machines are used for a variety of applications, including grinding the surface of a workpiece, shaping the contour of a workpiece, and producing precise holes or features on a workpiece.

Combined grinding machines are known for their high precision and efficiency, and are an important tool in many manufacturing and metalworking applications. They are typically used in conjunction with other machine tools, such as lathes and milling machines, to produce finished parts and components.