We create a sketch of a thin-walled cone, in our case it is a cone with dimensions of an upper diameter of 200 mm, a bottom diameter of 400 mm, a wall thickness of 4 mm. Create a 3D object using the resulting sketch using the rotation command. Next, create a sketch in order to cut a slot 0.1 mm in the created cone. That is, it should look like a non-closed volume cone. The operation is cutting out the slits. Next, go to the medium sheet metal and set the thickness of the sheet in our case is 4 mm. Finally, execute the sweep command by selecting the surface of the cone.