Part Modeling > Engineering Features > Shell > To Create a Shell Feature
  
To Create a Shell Feature
1. Click Model > Shell. The Shell tab opens.
A default thickness is applied to the inside of all the surfaces, creating a “closed” shell, and displays the preview geometry. The default thickness value is displayed in the graphics window and in the Thickness box on the Shell tab.
2. To remove surfaces during the Shell feature creation, click the References tab, click the Removed surfaces collector, and select one or more surfaces. The selected surfaces are removed, and the preview geometry is updated.
 
* You can also select the surfaces to remove before you enter the Shell tool. While creating or redefining the Shell feature, you can, at any time, select additional surfaces to remove, or clear the selection of some of the previously selected surfaces, by activating the Removed surfaces collector on the References tab. This collector is always active when you start to create or redefine a Shell feature.
3. To modify the shell thickness, type or select a value in the Thickness box on the Shell tab. You can also drag the handle or double-click the thickness value and type or select the new value.
4. To flip the shell side, click . You can also use the Flip command on the Shell shortcut menu.
5. To specify surfaces with a different thickness, open the References tab, click the Non-default thickness collector, and select surfaces. You can also use the Non Default Thickness command on the shortcut menu.
For each selected surface with a non-default thickness, The system displays a handle and an associated thickness value. It also adds a line with the surface name and thickness value (initially equal to the default shell thickness) in the Non-default thickness collector on the References tab. To modify a non-default thickness, drag the handle. You can also type or select a new value in the appropriate box in the Non-default thickness collector or in the graphic window.
6. To exclude surfaces from being shelled, open the Options tab, click the Excluded Surfaces collector, and select one or more surfaces to exclude from the shell. Alternatively, use the Exclude Surfaces command on the shortcut menu.
7. Click .