What is Doubly Nested Contour and how to solved it.

May 13, 2024

In some situation where we’re working on adding a groove to a part with sketch text in SOLIDWORKS, we might come across a message saying, “The sketch contains a doubly nested contour.” and the feature can’t be created as intended. Moreover, we’ll likely encounter difficulties when trying to use the contour selection tool to specify the exact area for applying the feature.

 

What is Doubly Nested Contour?

Doubly Nested Contour refers to a situation where a contour feature is nested within another contour feature within the same sketch. This can happen, for example, when creating complex sketches with overlapping or intersecting geometry, such as using sketch text or other intricate shapes. SOLIDWORKS may alert the user about doubly nested contours because they can sometimes cause issues or complications, particularly when applying features like extrusions or cuts. Therefore, it’s important to be aware of and address these situations appropriately during the design process to ensure accurate and effective modelling.

Here’s an example illustrating a doubly nested sketch contour issue and how to resolve it:

 

Problem Description:

The part below illustrates a sketch containing multiple contours, including a circular sketch and sketch text.

What is Doubly Nested Contour and how to solved it.

When attempting to apply a cut extrude to the sketch, this error message will appear.

What is Doubly Nested Contour and how to solved it.

To resolve this issue, begin by editing the sketch. Right-click on the text and select “Dissolve Sketch Text.” Before proceeding with dissolving the sketch text, ensure that the text appears exactly as desired, as once dissolved, it will transform into individual sketch entities and may be more challenging to adjust later on.

What is Doubly Nested Contour and how to solved it.

 

What is Doubly Nested Contour and how to solved it.

Before

What is Doubly Nested Contour and how to solved it.

After

After dissolving the sketch text, proceed to the extrude command and select the desired areas for extrusion.

What is Doubly Nested Contour and how to solved it.