Taper Extrusion Shape

In this Task 

A 2D polygonal shape will be extruded with a 5º deviation from the perpendicular path.

Before you Start 

The view is set to any isometric view.

The model is displayed in wireframe mode.

The Workplane is displayed.

Taper Extrusion Shape 

Ribbon : Draw | Draw 3D | Simple Extrude

Default Menu : Draw | 3D Object | 3D Profile Based | Simple Extrude

Palette : 3D Model | 3D Object | Simple Extrude

A draft angle can be applied to an extruded object to create an extrusion taper.Draft angles can be applied to all extruded profiles, such as a cylinder, polygonal prism, etc.

Place the Workplane on the top face of the cylinder, shown below, using Workplane by Facet.

Using the center of the original construction circle, insert a 2D polygon from the Draw menu. using the segment mode, with 8 sides.

Turn the view to Plan view, then reference the midpoint of the bottom edge of the polygon, shown below to define the radius.

Turn the view to an isometric view, then select the Simple Extrude tool from the menu options above and make sure the Draft Angle is set to 5º.

Extrude the new polygon to create an above Workplane height of 65, shown below.

Place the Workplane on the top of the extrusion and again insert another polygonal shape to the exact size as the top of the extrusion. 

Use the center of the construction circle to define the center and the edge of the extrusion to define the radius, shown below.

Select the Simple Extrude tool, then right click and select Properties.

Change the Draft Angle of the extrusion to -75 and extrude this new polygon to a height of 12, shown below.