topic Re: Trouble creating fillets on curved object in Fusion Design, Validate & Document Forum

Trouble creating fillets on curved object

Anonymous — Fri, 23 Oct 2020 21:07:02 GMT

I'm ok at design concepts but still a lot to learn about F360. I have design which started as a (quite clean) imported SVG sketch which was then extruded. When trying to fillet most of the curved edges, I get this error which I see all over the forum:

Error: The fillet/chamfer could not be created at the requested size.
Try adjusting the size, deselecting some of the edges (try disabling Tangent Chain), or using multiple separate operations.

I've read many posts and watched many videos and am no closer to a solution. I have a somewhat large design with many curved objects like the below, all of which need a fillet. Here's what I've tried:

selecting the face (as in the screenshot for extra visibility)
1 edge at a time, with and without tangent select
all edges at once
various select filters, window selection options
various fillet dimensions

Each gives me the same or similar error. It's just not clear to me how to troubleshoot what's going on based on the error message. Fillet just seems to be picky. 🙂

I've attached f3d file as well. You'll see a bunch of one-off fillets of objects with straight edges -- those worked fine. I have no issues starting from scratch if only I knew what I needed to do differently as this is driving me nuts!

TIA! -hal

Re: Trouble creating fillets on curved object

etfrench — Sat, 24 Oct 2020 07:20:20 GMT

It looks like there is a lot of symmetry in the model, so first break it down as much as possible:

Next, turn Tangent Chain off in the Fillet dialog, then select individual segments. Modify the model at the points you find the fillet errors:

It shouldn't take too long to complete the model.

Re: Trouble creating fillets on curved object

jean.flower — Sat, 24 Oct 2020 08:27:17 GMT

Hi @Anonymous
I followed a similar path to @etfrench . I built chamfers that worked and progressively grew them step by step around the outlines. As I went, I made adjustments to the sketches or to the extrusions to make the chamfer work.

Here's the result:

Details:

Here's part of diagnosis with chamfers working after I added circles to the sketch at the potential problem areas

I removed these circles one by one to see where the chamfers were having trouble joining up.

The first problem I found was a small glitch in the sketch:

I fixed this by selecting the four thin faces and using delete face. The second issue was where the sketch shape has sharp corners like these. The chamfers are struggling to close off against each other, or when they do, make a undesirable long groove into the top of the extrude. Help the chamfers turn the corner by adding a small fillet first.

This same approach was required on another part - I added four fillets here

A third type of adjustment and we're done. There's a narrow very high curvature region where these faces meet - they're actually tangent. The chamfer will successfully mitre across this if it's altered to be a sharp corner instead.

Then I would use pattern to put these chamfered results across the result of the design. In retrospect, I should have halved each of these three pieces, chamfered a half, and then mirrored to complete. That would have been less work.

This was an interesting challenge, thanks for the model!

Hope you find some value in these strategies.

Re: Trouble creating fillets on curved object

Anonymous — Mon, 26 Oct 2020 11:52:16 GMT

Thanks for all the insight and detailed answers @etfrench @jean.flower !

I have learned a lot. Like don't trust what I'm importing. 😞

I guess the root of the problem is that creating a two-dimensional illustration not designed intentionally for CAD will often result in model issues down the road. I didn't create the SVG myself, it's just something that my wife thought was really cool looking so we bought it off of a design site. Under the microscope so to speak, I can now see that the model just isn't as precise as what is needed.

Using the techniques above, we were able to get pretty close to where we wanted to be. (After way too much work!) Thanks again!

Re: Trouble creating fillets on curved object

shahriarsifat1802164 — Thu, 29 Oct 2020 07:01:42 GMT

Hi,
In this case, chamfer command will be much useful than fillet I guess and you can divide them into several portions.
Thank you.