topic Re: A Fillet problem in Fusion Design, Validate & Document Forum

A Fillet problem

lemelman — Fri, 20 Jun 2025 09:55:34 GMT

I'm missing something, but what? I just want to fillet an edge, but get an error whatever I try. Can you help please?

Re: A Fillet problem

davebYYPCU — Fri, 20 Jun 2025 10:30:16 GMT

Can't say why, but suspect that the separate faces (circled) on the lower side should not be there, considering that sketch 2 spline has no breaks there, (yellow highlight)

Two projected overlapping splines one purple one green, and double profiles is where I would be digging.

That these 2 splines are mirrored and I can't see a Tangent icon for them, may be an indirect factor.

Might help....

Betreff: A Fillet problem

g-andresen — Fri, 20 Jun 2025 10:42:44 GMT

Hi,

try delete faces or change extrusion direction

(view in My Videos)

günther

Re: A Fillet problem

TrippyLighting — Fri, 20 Jun 2025 13:46:09 GMT

@lemelman , you need to take a step back and learn proper sketching techniques

1. Fully dimension and constrain at least those sketches that don't contain splines.

2. Some of the spline ends are missing tangent constraints.

3. Don't mirror fit-point splines, as edits to those splines might result in a lack of symmetry. This isn't something many users are aware of and is related to how finite point splines are implemented in Fusion.

You'll find that when using sound sketching techniques, you'll most often not encounter issues like this.

Re: A Fillet problem

TrippyLighting — Fri, 20 Jun 2025 14:15:51 GMT

I dug a little deeper, and sketching is tolerable. It could be better, but it isn't the real culprit here.
The real culprit is one of the extrusions that isn't needed:

(view in My Videos)

Re: A Fillet problem

lemelman — Fri, 20 Jun 2025 17:08:22 GMT

Thank you all for your excellent observations and suggestions. Although I made the ends of the splines inline with their parent lines that was clearly insufficient to ensure tangential. After specifying tangential I was able to create the required fillets. Thank you also for the suggestion of eliminating the extra extrude. I didn't know you could use a curved surface as a target for an extrude. It's much better than my rather crude attempt.

Re: A Fillet problem

TrippyLighting — Fri, 20 Jun 2025 17:49:46 GMT

1. I unmarked your post as the solution and marked the ones from me, @g-andresen , and @davebYYPCU as solutions.

2. A colinear constraint, or snapping the end of a tangent handle to a line, is equivalent to a tangent constraint.

Re: A Fillet problem

lemelman — Sat, 21 Jun 2025 08:32:42 GMT

1. I apologise for breaking an attribution protocol, I thought I was just reporting that it was solved.

2. I can't explain why it worked after specifically adding a tangent constraint - see attached screenshot.

3. Actually, I like your extrusion solution best - it worked and I've learnt something new.

Re: A Fillet problem

TrippyLighting — Sat, 21 Jun 2025 10:00:36 GMT

@lemelman wrote:

1. I apologise for breaking an attribution protocol, I thought I was just reporting that it was solved.

It isn't a protocol 😉
Marking one or more posts as the solution helps other users with similar problems find a solution quickly. This thread is pretty short, so that isn't a problem, but there are very long threads where it can be beneficial.