topic Re: Problem with chamfer round object in Fusion Design, Validate & Document Forum

Problem with chamfer round object

mike_vos — Wed, 22 Jan 2025 16:19:29 GMT

I have the following error when trying to chamfer a round object:

Error: The fillet/chamfer could not be created at the requested size. This might be occurring at the ends of the selected edges.
Try adjusting the size or using multiple separate operations. Check that the selected edge chain ends at a sensible position, and if not try selecting more edges.

I also put a picture to make clear what i want to chamfer.

Does anybody know how to fix this?

Thanks in advance

Re: Problem with chamfer round object

TrippyLighting — Wed, 22 Jan 2025 16:38:13 GMT

Can you share your model?

Re: Problem with chamfer round object

johnsonshiue — Wed, 22 Jan 2025 17:45:53 GMT

Hi! I suspect you may need to select the three connecting edges together to create one chamfer. Another approach is to use a brutal technique of Offset, Split, Delete Face, Loft, and Stitch.

- Offset the adjacent faces to the desirable distance.

- Split the faces using the offset surfaces.

- Use Delete Face (Surface) to delete the split faces.

- Create a Surface Loft to cover the opening.

- Stitch the surfaces back to a solid body.

If it does not work, please share the f3d file here. The forum experts can help take a look.

Many thanks!

Re: Problem with chamfer round object

etfrench — Wed, 22 Jan 2025 19:55:52 GMT

Start by extruding one section and chamfering one edge:

Repeat for the second circle:

Extrude the outer ring and combine with the other two bodies

Chamfer it:

Repeat the process for the other three openings.

Re: Problem with chamfer round object

etfrench — Wed, 22 Jan 2025 20:02:04 GMT

Actually, it's better to do both sides of one circle, then pattern that. Add the outer ring and chamfer it:

Re: Problem with chamfer round object

laughingcreek — Wed, 22 Jan 2025 22:39:17 GMT

this geometry should chamfer without any problem if it is properly made. before going to any great lengths trying to do this with any of the suggestions here just to hack a chamfer onto it you should post your model (export a .f3d and attach). even if you are able to hack your way into getting a chamfer, if the geometry is subpar, you're likely to continue to run into issues in other areas. understanding and fixing the underlying geometry issues would be be better.

Re: Problem with chamfer round object

TrippyLighting — Wed, 22 Jan 2025 23:44:20 GMT

@laughingcreek wrote:

this geometry should chamfer without any problem if it is properly made. before going to any great lengths trying to do this with any of the suggestions here just to hack a chamfer onto it you should post your model (export a .f3d and attach). even if you are able to hack your way into getting a chamfer, if the geometry is subpar, you're likely to continue to run into issues in other areas. understanding and fixing the underlying geometry issues would be be better.

I should save this as a text block 😉

Re: Problem with chamfer round object

etfrench — Wed, 22 Jan 2025 23:50:50 GMT

The sharp angles in this design are blocking the chamfer operation. Try it.

Re: Problem with chamfer round object

laughingcreek — Thu, 23 Jan 2025 00:02:17 GMT

@etfrench wrote:

The sharp angles in this design are blocking the chamfer operation. Try it.

I did of course-

Re: Problem with chamfer round object

TrippyLighting — Thu, 23 Jan 2025 00:05:02 GMT

@etfrench wrote:
... Try it.

Neither you nor the OP attached a model 😉

I'd love to take a stab at it. If it really doesn't work - not doubting your observation - then there might be yet another bug to report.

Re: Problem with chamfer round object

laughingcreek — Thu, 23 Jan 2025 00:17:24 GMT

Re: Problem with chamfer round object

TrippyLighting — Thu, 23 Jan 2025 00:26:11 GMT

Thanks! It works fine in your model 😉

It isn't unusual, though, that a different but valid combination of steps or just different dimensions make Fusion cough hard.

Re: Problem with chamfer round object

etfrench — Thu, 23 Jan 2025 01:48:33 GMT

The amount of overlap between the circles determines if the triangular opening will chamfer. When it is close to the center to center line, if fails:

When it's further away it succeeds:

Re: Problem with chamfer round object

mike_vos — Thu, 23 Jan 2025 12:32:42 GMT

Thanks for all the replies, unfortunatly i forgot to add the f3d file but here it is! maybe there is a problem with the way i designed it.

Kind regards, Mike

Re: Problem with chamfer round object

TrippyLighting — Thu, 23 Jan 2025 12:45:59 GMT

Thanks for the file. This should just work!

@Phil.E Here's another bug.

Re: Problem with chamfer round object

TheCADWhisperer — Thu, 23 Jan 2025 14:01:47 GMT

@mike_vos

I don't think the issue is with Chamfer.

I think the issue is a matter of user logic - the Chamfer is not going to end the way you expect it to.

The circles in the image below represent where the edges of the Chamfers would be on this face at this size.

On another note: I would never have repeated dimensions in sketch like this - look for symmetry and apply to Bodies/Features.

Re: Problem with chamfer round object

TrippyLighting — Thu, 23 Jan 2025 14:28:12 GMT

@TheCADWhisperer Thanks! I clearly did not have my thinking cap on 😕

Usually when filleting/chamfering starts to create problems, I start with a very small fillet. If that succeeds I increase the size and see where it starts failing. I omitted that here as well 😕

One solution, however has already been posted by @etfrench. The red circled area has the chamfer "fade out". More work, but a very nice solution!

Re: Problem with chamfer round object

TheCADWhisperer — Thu, 23 Jan 2025 14:47:49 GMT

@mike_vos

One possible solution attached.

I am not completely satisfied with this one - but it should give you some ideas.

Notice simplified sketch...

with a bit more effort I think it could be made fully parametric in that it would not break with (reasonable) edits.

Re: Problem with chamfer round object

laughingcreek — Sat, 25 Jan 2025 03:42:12 GMT

I would just keep it simple like in the attached. this method is strait forward and the chamfer isn't sensitive to the thickness of the rings. the rings do overlap (which is why it works) instead of touching tangent to each other at their outer diameter, bit perhaps it will still work for you.