Autodesk Inventor Tutorials

Prepare Semi-Unintelligent Parts with Suppression and Sculpt Wrapping

When a design is to be sent out for vendor or client use, it is often necessary to remove some design information, but also to retain critical information for the downstream users. In the end, we want a part that is easy for our clients to use, but difficult for them to have another manufacturer replicate or reverse-engineer. Sometimes this is unavoidable with your particular products, but for parts with complex core/cavity systems like hydraulics manifolds or castings, it is definitely something to strive for. A fair balance must be struck between the outside world and your engineering department on what is critical and what is not. When Autodesk Inventor introduced Shrinkwrap in 2010, many users got the idea that this was the be-all and end-all simplification tool for this need. After looking at Shrinkwrap, however, it becomes apparent that this is an all-or-nothing scenario, where very little control is given over specific hole-patching and how much of the hole depth is patched. Also, control for removing other outside geometry is not available; Shrinkwrap simply removes interior geometry. Once the design criteria have been examined and agreed upon, the simplification process can begin. In this example (below left), we have determined that the half-moon–shaped cut on the bottom of this part, as well as the location of two of the mounting holes (in red, below right), are too design-sensitive to be examined by third parties directly through the model. Since the two mounting holes are the same size, the Shrinkwrap command will not allow these holes to be filled without filling the other two holes as well. The other two holes are important to the client for locational reference, and must be visualized when exported. To help in translation file size, we have also decided to turn off the non-critical fillets of the model. This example becomes rather easy, considering the features we need to turn off are ones we created as separate features during the design process. Let's take it a step further and create a parametric rule that aids us in the suppression of the desired feature so we can come back to this model and easily go between the two. We'll start by suppressing the required features in the model that were created during the design process. (Note: If you are using Suppression, it is important to avoid too many parent–child dependencies, as the suppression of one feature can cause the failure of another.

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