There are certain fillet application when we are require to apply internal fillet in area that don’t have enough material. For this cases either it will result in error or the fillet will be disfigured whereby additional material will be added and change the geometry.
You may view this as the image shown below
- Example you have a geometry with an area of 10mm step.
2. And when u applied 30mm fillet(any value bigger then the 10mm step), you can see that it add the material to compensate the fillet. this is because to apply internal fillet, you need sufficient material and if the material is not enough, sometimes it will automatically created.
And for this case, the added material change the geometry of the part.
3. To resolve this issue, while applying the fillet, you may select the More>> button.
4. Here you can see there is an option Edge(s) to keep. Select the edge to keep as shown to tell the feature that this edge is required to be kept/remain.
5. By doing this, the fillet still going to be executed as 30mm, however it will limit itself at the selected edge. With this, the 30mm fillet still can be apply and the edge is being keep while keeping the geometry of the original edge maintain with out the previous additional material.