I am a beginner practicing with Inventor 2021 LT and I was working on the following sample drawing when I ran into an issue with fillets:

Example 107

At the top edge of the U-shape slot, a rounded corner can be seen between the out side edge of the U and the the outside face of the vertical wall. Since the U shape protrude 3 mm I did not think there would be an issue. I tried filleting around the outside of the U (not top) and the top and side edge of the vertical wall, but that failed. I tried different orders of selecting but that did not change anything

All fillets selected

If I fillet the U first, apply it, then try to fillet the back wall, The edge becomes continuous and fillets out to the face of the U which is not like the example.

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If I fillet the back wall first, apply it, then fillet the U it fails to create the fillet.

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So far this is the closest I can get. which misses the fillet around the U.

enter image description here

Is there something special I need to do to make this filleting work?

  • 2
    $\begingroup$ I have not done any testing, but perhaps the fillet will work if you extrude the face of the U further away, fillet the edge, and then cut it back. In real life this fillet is formed on a larger bit of material by casting, and then the face of the U is post machined. $\endgroup$ Oct 16, 2021 at 7:38
  • $\begingroup$ What do the instructions say about filleting? $\endgroup$
    – Solar Mike
    Oct 17, 2021 at 20:22
  • 1
    $\begingroup$ Did you assign the fillet size as "3"? Reduce it to "1" and see how it goes. Note, the fillet on the circle wasn't correct either. $\endgroup$
    – r13
    Oct 17, 2021 at 21:07


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