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Overview
In this Tech Tip, we will explain about Advanced options in ‘Shell’ feature. We will see in detail how to exclude some unwanted surfaces from the definition of ‘Shell’ feature.

The User Case
In following figure, a Shell type feature is created and the bottom surface of the flange is selected as ‘Removed Surface’. By default, the Shell feature has removed the entire bottom surface of the flange and thus the circular and C shaped protrusions have also been hollowed with a thickness of 1 mm. Due to the dimensions of circular and C shaped protrusion, the maximum applicable thickness of the Shell feature is restricted to 2 mm.

Now we need to exclude the circular and C shaped protrusions from the Shell definition and in doing so, we need to increase the thickness of the Shell feature to 5 mm.