The model AC-80 cutting machine is composed of main machine, electric control box, cutting room, motor, cooling system, cutting grinding wheel and other parts. The cutting machine can not only cut diameter of 100mm within the circular workpiece, but also can cut rectangular specimens within the cutting of hight 70mm, depth 100mm. The machine cool the sample through a cooling system to prevent overheating and burning during the cutting process. The machine can also set the cutting speed in accordance with the different specimen so as to improve the quality of cutting samples. The machine has the manual cutting and automatic cutting. It is more convenient for user to use because of the large cutting chamber and meanwhile it is s one of the sample preparation equipment of colleges and universities, factories and enterprises for metallographic test.