There is a new enhancement in SolidWorks 2016 that will allow you to define the edges of constant and variable fillets as curvature continuous. This option creates a smoother curvature between adjacent surfaces. Here’s an example of how it works . . .
The part shown above contains two surfaces that meet at a sharp edge. Select the edge, and go to Insert > Features > and select Fillet/Round.
In the property manager under Fillet Type, click Constant Size Fillet.
Next, under Items to Fillet, select both Tangent Propagation and Full Preview.
Under Fillet Parameters, select Symmetric in the drop down list and then set the radius to 40 mm.
Finally, under Profile select Curvature Continuous.
Save the changes and observe the smooth fillet that is tangent to both surfaces.
When creating edge fillets, this new option will allow you to easily make smooth fillets that are continuous to the adjacent body curvature.
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