Learning the Essentials of Part Modeling - Inventor 2013 and Inventor LT 2013 Essentials - page 74

2. Click the Extrude tool on the 3D Model tab in the Create panel.
A preview of a surface model will appear. Inventor will extrude a
surface when there is no closed profile. Even though the dimensions
create an intact perimeter, Inventor needs line and arc endpoints to
be coincident to form a completely closed sketch.
Instead of stopping the command, you can force the issue by telling
Inventor that you want to create a solid.
3. In the Extrude dialog box, click the Solid option in the Output group.
This will cause an error to be presented in the dialog box. It will
also activate an icon at the bottom of the dialog box with a red cross.
This is called the Sketch Doctor.
4. Click the Examine Profile Problems tool.
The message in the Sketch Doctor - Examine dialog box will tell
you about the open loop in the profile.
5. Click Next to continue.
6. In the Sketch Doctor - Treat dialog box (Figure 3.12), click the Close
Loop treatment option, and then click Finish.
FIGURE 3.12 Selecting the treatment
option for sketch problems
7. Click Yes to combine the points and make a closed sketch.
8. Click OK to close the dialog box informing you that the sketch is now
closed.
9. Start the Dimension tool and pick the green line in the sketch.
A new Redundant Points dialog box (Figure 3.13) will appear, and
in the Design window these points will be highlighted.
10. Pick a place to position the new dimension.
This will launch the dialog box shown in Figure 3.14, warning
you that adding the dimension will over-constrain the sketch. This