Fillet doesn't work

[netabreuer]

HI,

I've been trying to make a 2mm fillet on the front and back parts of this model, and for some reason couldn't. only 1 mm was possible.

can someone please explain what is the problem?

the model was created in t-spline, than was moved to solid and was extruded and than---fillet.

Many Thanks!

[netabreuer]

screenshots

[jeff_strater]

we will need to see the model itself.  Please export the model as a Fusion Archive (F3D/F3Z) and attach it here.

I'm not sure what workflow you are describing here:  "the model was created in t-spline, than was moved to solid and was extruded and than---fillet.".  You are Extruding the result of a T-Spline model?  Extrude requires a planar profile, and unless you are creasing the model in T-Splines, there are rarely any planes in a T-Spline body.

Also, check the curvature of the edges, as that can affect Fillet results.

[TrippyLighting]

Looking at the timeline fragments, a T-Spline forms the base of the shoe. When "finish form" was performed it converted into a solid and the rectangular cut-outs and the slanted ends were cut-extruded through the base. Then the rectangular cutouts were somewhat clumsily filleted. The curved edges that remain from cut-extruding the slanted ends are the problem.

This might need a slightly different design workflow.  

@netabreuer we need the original model in .f3dformat.Perhaps without the imported mesh geometry, because that just makes the model big and in this case the mesh does not help in solving the filleting problem.

[netabreuer]

HI,

@jeff_strater Sorry if it wasn't comprehensible, but fortunetly @TrippyLighting  got it right 🙂

I've attached the file (with the mesh geometry...I didn't know how to exclude it).

Thank you!

[jeff_strater · Accepted solution]

Thanks for the clarification, @netabreuer , and the model.  I guess the short answer here is:  This is a legitimate Fillet failure case.  If you turn on Curvature Comb analysis for this model, you can see that there are areas of very high curvature at the bottom corners:

And, those will always cause Fillet failures.  Further, you can see as you increase the Fillet radius, the geometry in those corners gets strange:

Which, I think, is an early indication that this is a problem area for Fillet.

As to what to do:  @TrippyLighting is right - possibly a different workflow is needed - perhaps a different way to do that front/back cut that doesn't result in such high curvature, or adding this geometry in the T-Spline model, or even modifying the T-Spline, or the sketch, to get a result that is more easily Filleted.  You could possibly use a different type of Fillet as well.  Perhaps you could define a Variable Radius fillet that has a smaller radius in the area of high curvature would help.

[netabreuer]

@jeff_strater Thank you!