A pipe expanding mechanism design plan. When you rotate the “center pan” (part), it expands. You can rotate the mechanism manually or with a motor. Parts are designed for CNC machining. Suggesting to use steel to manufacture the parts. To manufacture and assemble the mechanism, you should have some knowledge about mechanical engineering, and know how to buy some screws, springs, etc.3D model and 2D drawing are included, including STEP, PDF, 3DPDF, DXF formats files.Ignore STL,OBJ and FBX files, they are only used to meet the platform’s requirement.