topic Re: Inverted / Concave Fillet in Fusion Design, Validate & Document Forum

Inverted / Concave Fillet

docara — Thu, 14 Feb 2019 20:16:48 GMT

Hello Everyone,

Is an 'inverted' or a negative fillet possible on an external corner?

I'm trying to model a concave wooden trim for a window.

It seems such a faff to have to model a radius then Extrude or Sweep around a path when the facility to use a minus fillet dimension would make things so simple.

Thanks

Re: Inverted / Concave Fillet

TrippyLighting — Thu, 14 Feb 2019 20:40:27 GMT

Like this ?

Re: Inverted / Concave Fillet

docara — Fri, 15 Feb 2019 00:21:47 GMT

Clever!!!! Nice bit of lateral thinking

Thanks

Re: Inverted / Concave Fillet

mad.macs — Fri, 07 Feb 2020 17:03:53 GMT

It appears inventor has this feature built in, which is nice. I don't see it in Fusion though. I'll try the workaround.

Re: Inverted / Concave Fillet

TheCADWhisperer — Fri, 07 Feb 2020 17:30:37 GMT

File>Export and Attach your *.f3d file here.

~~I am not aware of any difference between Inventor and Fusion in this Fillet functionality.~~

~~Please Attach your *.ipt file too that illustrates this functionality.~~

Ha! It is in there.

Learned something new today.

Re: Inverted / Concave Fillet

mad.macs — Fri, 07 Feb 2020 17:29:05 GMT

Here is a screenshot of changing the feature in Inventor (I know almost nothing of inventor this is from a Youtube video)

Here's What I see in Fusion.

I did get the workaround to function.

Re: Inverted / Concave Fillet

Anonymous — Mon, 28 Sep 2020 21:28:13 GMT

This post was very useful for making a concave side to a tabletop in Fusion360. Thanks to this explanation and some trial and error, I was able to do the following:

- select one plane/side of the table

- on the corner model a sketch of a 3-point arc

- sweep around.

Now, the challenge I try to solve is that I have a top with a lowered midsection. And I would like to do a concave on the inside edge of the tabletop instead of the outside, as the glass that will be put on top has a fillet. I was able to make the sketch as described above and then transfer it to the inside plane. The challenge is that the sweep is not working. Does anyone have a solution or suggestion on how to make the concave on the inside plane?

Re: Inverted / Concave Fillet

matthewmads — Fri, 02 Sep 2022 14:39:05 GMT

Brilliant. This is exactly what I was looking for.

thank you

Re: Inverted / Concave Fillet

shdwlynx — Thu, 14 Dec 2023 22:08:25 GMT

For anyone stumbling on to this looking for an inverse filet, here is the (rather simple) steps I gathered from the video above (that user gets all the credit - I'm just acting as a secretary!):

Select the edge(s) that need the inverse filet applied
Click on the Create dropdown under the Solid menu
Click on Pipe
Adjust pipe diameter as needed (ensure Operation is set to Cut which will carve it out)