Fillet creation error... ???

[fritter63]

See attached video. Is this the correct behavior? I would expect the fillet to be created only along the length of the highlighted profile. Instead it runs full length.

Note than when I did it on another version with a cylinder in that location rather than a cube, it worked correctly.

https://knowledge.autodesk.com/community/screencast/44ca8c5a-1fce-4f8b-8e67-7111c0f3baa4

[jeff_strater]

This looks like an issue with the way the tangent chainging works.  This edge is not exactly "tangent", though, because both parts of the edge looks like they are linear.

Could you share or post the model, so we can take a look at it?

Thanks,

Jeff Strater (Fusion development)

[fritter63]

@jeff_strater

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@jeff_strater wrote:

This looks like an issue with the way the tangent chainging works.  This edge is not exactly "tangent", though, because both parts of the edge looks like they are linear.

Could you share or post the model, so we can take a look at it?

Thanks,

Jeff Strater (Fusion development)

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Here's the link. Will pm you the password:

http://a360.co/20ywjb0

[jeff_strater]

Thanks for the model.  I see the behavior, although I cannot yet explain it completely.  I had not realized in your video that this was all one body, but I see that it is.  This is a strange case for Fillet.  the edge is really two edges along the same line - filleting one half of it produces a concave fillet, and the other half would be a convex fillet.  It appears that Fusion behaves rather strangely in this case.  I re-created a simpler case here:

Bottom line is, I need to check with our geometry kernel guys, but this looks strange at best.  Most likely they will tell me its the expected result, but I need to check with them to be sure.

Thanks for posting this very interesting case.

Jeff

[fritter63]

Yeah, so the whole point of that fillet is to have it act as a "gusset" to re-inforce that joint (as if it had been welded together). It is only one body now because I combined the two together after 

extruding a sketch in both directions, until it intersected the blade holder part of the model. I had to do that to get it to give me just a line along the intersection as the fillet  curve.

So maybe the wierdness is a result of having joined the two bodies together?

[HughesTooling]

A possible workaround if you need one is to put a small rad on the other corners first.

[fritter63]

After watching Jeff's video, I found that I can get it to work by just "pulling" the fillet farther. Ie, at 3 mm, you get their wierdness, but at 3.5, you get it ending as desired. Hadn't tried that

before because usually it will complain that it can't create the fillet when it interferes with other geometries.

[jeff_strater]

This turns out to be a bug in the Fillet geometry calculation kernel.  Thanks for pointing out!  We'll put it on the list of bugs to fix.

Jeff

[PhilProcarioJr]

If you need the fillet to be a distance that it does this weird thing try this.

Might take a few min to upload but this works every time to get around this issue. Then just combine the two bodies back together when your done.

http://autode.sk/1W6VgUt