Rotary cutting mechanism, the model driven by sprocket section of high speed rotation, can undertake cutting hard metal materials, such as steel, aluminum and so on, the institutions include: 1. The rotating clamping device 2. vacuum dust collection mechanism 3. sprocket mechanism 4.rotating blades mechanism ************************************** Files format contains -solidworks 2017 -step -iges -stl -obj -3ds - and other formats ************************************** If you like,you can paypal for you to get this models or if you have any questions also you can email to me. **************************************