The main axle of the saw is made precisely highly, and is specialized for the hard ally saw. The go and back of the cutting can synchronous with the left and right moving of the head of the machine, is made by the bearing pair. The moving of the saw is motivates by the hydraulic damper cylinder. The range of the production is very large , and the length of cutting can arrive 4200mm, the cutting angles are 90,45 and 22.5. They can change into another automatically. The frame can go and back automatically with the head of the machine.The safety precaution can up and down with the saw safely.The air valves control the corner cylinder, and save the electricity of the machine.