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

Fillet errors

MJEFab — Mon, 19 Aug 2024 16:43:31 GMT

So I originally had this part extruded more, and decided to keep it shorter. I had a heck of a time getting all the fillets originally, needing to size up or down by .001 until Fusion would solve them. But the editing of the extrusion broke the fillet. I went back to fix them, and I can't get this last one for the life of me, at any size. I keep getting a C math library or a problem combining the geometry.

What gives? I exported a STEP into Alibre Design, which had no problem with the fillet. Fillets always cause errors in every design, and I'm not sure why or how to fix.

Thanks for any help

Matt

Re: Fillet errors

jhackney1972 — Mon, 19 Aug 2024 17:05:29 GMT

Please indicate the FILLET in question.

Re: Fillet errors

MJEFab — Mon, 19 Aug 2024 21:33:20 GMT

Sorry, I uploaded the wrong one. I don't know if this will be right. Everytime I upload the one with the bad fillet into Fusion, it updates it to the one I got working in Alibre. Because I uploaded it, it is on version one. It was happening with the one I circled in the screenshot.

Re: Fillet errors

user015M86Y — Wed, 21 Aug 2024 21:51:45 GMT

Hi,

In fact fillet do not function because for me the tangent constraint is not effective

I use sweep command for both spline

Re: Fillet errors

TrippyLighting — Thu, 22 Aug 2024 10:35:36 GMT

@user015M86Y wrote:

... for me the tangent constraint is not effective...

Can you explain what you mean with that?

The trouble you are running into is likely due to the use of imported (sketch) geometry form a .dxf or .svg file generated in a different non-CAD software. These problems are a frequent occurrence in Fusion as the imported geometry in the originating software does not have to adhere to the stringent tolerances used by Fusion.

Re: Fillet errors

user015M86Y — Thu, 22 Aug 2024 11:17:54 GMT

@TrippyLighting

Hi, when you select the 2 spline and toogle curvature dispay the continuity is very bad

When I sweep the 2 curve with the sketch radius I got the same problem

To achieve the 2 fillets I create 2 sketch : after sweep it remain a thin surface

See a the end of timeline the delete face

I hope my reasoning is correct, otherwise please correct me.

Re: Fillet errors

TrippyLighting — Thu, 22 Aug 2024 13:11:42 GMT

@user015M86Y wrote:

@TrippyLighting

Hi, when you select the 2 spline and toogle curvature dispay the continuity is very bad

It is?

This isn't "bad" continuity. The individual curves are smooth. The transition visually looks like tangency.

However, it's just a visual cue and the near-tangent condition is likely too small to be visible in the curvature combs.

Near-tangency is a common occurrence with imported sketch geometry.

Re: Fillet errors

MJEFab — Thu, 22 Aug 2024 13:42:59 GMT

I see what you did. I originally tried something like this, but with only one sketch to cut out, and it failed to sweep because I didn't have the sketch touching the edge to sweep.

Re: Fillet errors

MJEFab — Thu, 22 Aug 2024 13:47:14 GMT

I know all too well about the problems with importing dxf's and svg's; It seems every one I need to find the disconnected line. But it is just part of my workflow when creating projects for cnc plasma or 3d printing. I wish there was a better way that I knew of, but it works better than Alibre Design; those usually fail to even import.

Re: Fillet errors

MJEFab — Thu, 22 Aug 2024 13:49:49 GMT

Whats weird is that this extrusion was originally higher, and through fiddling I got all the fillets to work. Then when I went back to shrink it, they all broke so I had to redo. But this one wouldn't. I'll try and remember the sweeping along two planes, although to be honest I wish it wasn't such a long workflow to do something that should be able to be handles with the fillet command.

Thanks for your help.