Reshaping Corners  

Sometimes, while filleting you can see that corners resulting from the operation are not satisfactory. The "Blend Corners" capability lets you quickly reshape these corners
Open the BlendCorner.CATPart document.
  1. Click Edge Fillet and fillet the four edges as shown using 5mm as the radius value.
    Careful! When you select edges, the order of selection affects the final shape of the fillet. This explains why you may sometimes encounter error messages when filleting.
    To obtain the shape we need for our scenario,  select the edges counter-clockwise.

    Take a closer look at the resulting corner: the shape style is not satisfactory. 

  2. To round the corner again, double-click the fillet and in the dialog box click the More button to access additional options.

  3. Click the Blend corners button to detect the corner to reshape. In our present example, only one corner is detected. The application shows it in the geometry area.

  4. The setback distance determines for each edge a free area measured from the vertex along the edge. In this area, the system adds material so as to improve the corner shape.

The Blend Corner option is available through the Variable Radius Fillet command too.

  1. Enter a value in the setback distance field. For example, 13.

  2. Click Preview to examine the result.
    To edit the distance for the top edge, click 13 and enter 22 as the new value in the Setback distance field.

  3. Repeat the operation for the edge below using the same distance value.

  4. Click OK to confirm the operation.
    The corner is reshaped.

More About Setback Distances

When setting a setback distance value, please note the following restrictions:

  • The setback distance value must not exceed the length of the corresponding concurrent edge. Consequently, the application does not take into account edges following the concurrent edge.
  • After modifying (i.e. adding or removing) edges used in a fillet definition, the defined blend corners are lost. Consequently, you need to re-specify the corners and the setback distances for each corner.