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 mechanism3. 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.**************************************