Extruding Curved Polygons

Extruding Curved Polygons

Anonymous
Not applicable
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Message 1 of 5

Extruding Curved Polygons

Anonymous
Not applicable

Hello Autodesk Community and Staff,

 

In working on a modeling project for 3D printing, I’ve noticed a few interrelated roadblocks in my use of Fusion 360, and was wondering if you might have any insights.

 

Arcs, or even arcs combined with lines that should make a closed shape, aren’t defined as planes or panels, and thus can’t be extruded. As an example, see the highlighted quadrilateral comprised of arcs, which I was hoping to extrude:


CurvedSurfaceToExtrude.png

 

In attempting to create the quadrilateral mentioned above, especially in 3d sketching, sketch select doesn’t always seem to lock onto sketch points. Maybe some of this trouble is caused by the fact that it's hard to interact with sketch objects related to a different sketch plane than the one currently being worked on and that working on a single sketch plane often makes it difficult to work seamlessly in three dimensions.

 

While it certainly is possible to approximate rounded shapes with flat panels (through, for example, creating planes through two edges and building rectangles off of those) I was wondering if anyone knew a way to create curved surfaces such as the above, or if there’s a way this might be edited into the next version or patch of Fusion 360, for the sake of future projects?

 

As a side note, when many lines are sketched at once, and a shape is extruded from one part of this collection, the rest of the lines can no longer be accessed as far as I can tell--remedying this might well make for faster workflow in sketching.

 

Thank you so much for your time and concern,

 

An autodesk CAD student

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Message 2 of 5

Beyondforce
Advisor
Advisor

Hi @Anonymous,

 

In order to be able to Extrude a profile, the sketch must be closed.

From the image you have added, I can see that the top and bottom left side are not Coincident to the other lines. I can see that because the points are not Black!

You must use the Coincident constraint if the lines are not snapping to each other. As soon as you would do that, all the lines will be closed and you be able to extrude this profile.

 

Unfortunately, right now you have an open profile, which is why it will not Extrude!

 

Cheers / Ben
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Check out my YouTube channel: Fusion 360: NewbiesPlus

Ben Korez
Fusion 360 NewbiesPlus
Fusion 360 Hardware Benchmark
| YouTube

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Message 3 of 5

chrisplyler
Mentor
Mentor

 

A non-closed outline will not produce a profile that can be extruded in Model work space, that is true.

 

However, another reason is that all four of his corners are not on the same plane. He has created a 3D sketch, and even if it IS a closed shape, it STILL will not produce a profile that can be extruded in Model work space.

 

He will have to extrude the four lines as surfaces in the Patch work space, split the solid body's face with the resulting surfaces, and then Push/Pull that split face inwards or outwards as desired.

 

 

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Message 4 of 5

Beyondforce
Advisor
Advisor
@chrisplyler, you are right!
With that said, the 3D lines still need to be Coincident, otherwise, they could be moved be a mistake very easily. A none - closed surface could also cause issues with the Patch tool, the surface could come out not even or scrambled 😉

Ben Korez
Fusion 360 NewbiesPlus
Fusion 360 Hardware Benchmark
| YouTube

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Message 5 of 5

TrippyLighting
Consultant
Consultant

Points that are not on the sketch plane can only be moved with the move tool, you cannot move accidentally  by dragging in the viewport.

 

 


EESignature

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