Singularity Filleting Problem?

Rhino
1

Hi folks,
I have no doubt this has come up and been explained before. The attached model contains what I think you call a “singluarity” where several edges meet at a single point that is both an inside and outside corner. I’m trying to fillet this form on all edges with a .125" fillet. Can anyone guide me on how to accomplish this?

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image464×670 34 KB

Blend Problem 1.3dm (135.0 KB)

Thanks for the help with this.

Best,
Michael Deimen

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Blend Problem 1.3dm (677.4 KB) Using Xnurbs and some srf fillet is what I cam up with.-Mark

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I nominate @sgreenawalt for this one! :wink:

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I nominate Solidworks! I kid, I kid…I’ll take a look at it later lol.

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Hi Michael - the all-fillets answer is something like this:
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Using FilletSrf to make new fillets on top of what FilletEdge gets you (a gap at that corner - that is not a ‘singularity’ in Nurbs-speak btw, that is a different thing)

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and then trimming it in. The key is to get the blue fillet between the red surfaces, here:

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CornerFilletExample.3dm (119.0 KB)

-Pascal

1 Like
6

Mark,
This looks like the direction I was heading, but I’m not sure how you built the surface. Is there any way you can tell me the steps you went through?

Thanks,

Michael Deimen

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Here is my version using filletsrf
Blend Problemx.3dm (177.8 KB)

1 Like
8

I exploded your polysurface, then used FilletSrf on the three surfaces. Split those newly made fillets at the junctions. Then used the plugin, Xnurbs to build the 5 sided surface. —Mark

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One more option for ya, lol - I made the primary blends so that they met and the final hole was only 4 sided. Created a surface with Edge Curves, and then matched, up the degree and refined it till I had what I wanted. It’s a G1 (tangent) solution. This approach doesn’t require any 3rd party plugins, but definitely requires a bit more work/finesse.

Blend Problem 1_SGVersion.3dm (288.3 KB)

-Sky

1 Like
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Ok, I’ll have to look into Xnurbs. Haven’t loaded that yet. Thanks for the heads up.

Best,

Michael D.

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Hi Michael - just keep in mind that this is perfectly possible, though sometimes a puzzle, using only filleting - which may be an advantage in itself, there is no tricky surfacing to do - and only native Rhino tools.

-Pascal

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Thanks Jim,

I’ve gotten out of the habit of using filletsrf. I usually reach for the Fillet Edges tool. I’ll give it a try.

Thanks,

Michael D.

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Very crafty sir. Good thinking, I like it!

Thanks for the help with it,

Best,

Michael D.

1 Like
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Hi Pascal,

You were the quickest with an answer I understood, so I tried your approach first. It worked fine.

Thanks for the help with it!

Best,

Michael D.

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Blend Problem 1 (1).3dm (953.1 KB)
These are not rolling ball corners , but Xnurbs does them .–Mark