Extrude from lines to surface when a vertex has 3 or more lines
john_hackington
Member Posts: 43 ✭✭
Hi,
I'm trying to extrude surfaces from lines of a sketch. I found that when there's a vertex which is part of 3 or more lines, the extrude could not work. Only if the vertex is part of 2 lines can the surfaces be extruded.
A document for illustration is here:
https://cad.onshape.com/documents/5f9c6da6dbf6ad16d35794d3/w/ac9aaf877daceb83fa3aa208/e/fc09a0bdf361955d8bc3605e
Could someone help me understand why is this happening, and is there any way to go around this?
I'm trying to extrude surfaces from lines of a sketch. I found that when there's a vertex which is part of 3 or more lines, the extrude could not work. Only if the vertex is part of 2 lines can the surfaces be extruded.
A document for illustration is here:
https://cad.onshape.com/documents/5f9c6da6dbf6ad16d35794d3/w/ac9aaf877daceb83fa3aa208/e/fc09a0bdf361955d8bc3605e
Could someone help me understand why is this happening, and is there any way to go around this?
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Best Answers
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you can't have single surface body with edges which belong to three or more faces of that body, as well as you can't have a single solid body with zero thickness or self intersecting wire body. so if you need three surfaces extrude them successively by two or more extrude commands, and make it separate bodies
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first you may find usefull hexInfill and Lighten custom features:
https://cad.onshape.com/documents/5729ffb4e4b077d8431a8cea/v/bba4125ec64df8c43c6e876c/e/8cb802c1a9080d5481747743
https://cad.onshape.com/documents/573f7d70e4b0fddafb52148c/v/a8a36f6d743269e1b6886711/e/2dc22a6a95896a5243812d07
and in this particular case i would use all kinds of 3d patterning features instead of sketch patterns and solid geometry instead of surfaces, because you cant get all those patterned surfaces united into one body.
check this - https://cad.onshape.com/documents/b407202238117476399f1425/w/6a5b0296b320b89861f08d06/e/e182ce8ee341cd1e74f6ffe9
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Answers
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you can't have single surface body with edges which belong to three or more faces of that body, as well as you can't have a single solid body with zero thickness or self intersecting wire body. so if you need three surfaces extrude them successively by two or more extrude commands, and make it separate bodies
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@konstantin_shiriazdanov Thanks for the explanation!konstantin_shiriazdanov said:you can't have single surface body with edges which belong to three or more faces of that body, as well as you can't have a single solid body with zero thickness or self intersecting wire body. so if you need three surfaces extrude them successively by two or more extrude commands, and make it separate bodies
If possible, could you suggest an efficient way to extrude my honeycomb array below into walls of surfaces? Is there a better way than selecting the lines 2 after 2 to extrude?
https://cad.onshape.com/documents/192e63cd5f38078e96643b7b/w/2c2b028c91a4d601e45fad83/e/f5ef8c9e254fe0a0a7ca59fd
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first you may find usefull hexInfill and Lighten custom features:
https://cad.onshape.com/documents/5729ffb4e4b077d8431a8cea/v/bba4125ec64df8c43c6e876c/e/8cb802c1a9080d5481747743
https://cad.onshape.com/documents/573f7d70e4b0fddafb52148c/v/a8a36f6d743269e1b6886711/e/2dc22a6a95896a5243812d07
and in this particular case i would use all kinds of 3d patterning features instead of sketch patterns and solid geometry instead of surfaces, because you cant get all those patterned surfaces united into one body.
check this - https://cad.onshape.com/documents/b407202238117476399f1425/w/6a5b0296b320b89861f08d06/e/e182ce8ee341cd1e74f6ffe9
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@konstantin_shiriazdanov Thanks so much for introducing the custom features and suggesting a way to make the structure! The end result is indeed what I want to achieve.konstantin_shiriazdanov said:first you may find usefull hexInfill and Lighten custom features:
https://cad.onshape.com/documents/5729ffb4e4b077d8431a8cea/v/bba4125ec64df8c43c6e876c/e/8cb802c1a9080d5481747743
https://cad.onshape.com/documents/573f7d70e4b0fddafb52148c/v/a8a36f6d743269e1b6886711/e/2dc22a6a95896a5243812d07
and in this particular case i would use all kinds of 3d patterning features instead of sketch patterns and solid geometry instead of surfaces, because you cant get all those patterned surfaces united into one body.
check this - https://cad.onshape.com/documents/b407202238117476399f1425/w/6a5b0296b320b89861f08d06/e/e182ce8ee341cd1e74f6ffe9
I approached this from a sketch pattern because I found that high number solid patterning could be quite slow on Onshape, but the way that you used Remove to make the structure resolves my concern of the rendering time. Thank you!
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Hi @john_hackington
"Part pattern" and "Face pattern" should be very fast. Are you using "Feature Pattern"?Jake Rosenfeld - Modeling Team0 -
Hi @Jake_Rosenfeld, thanks for asking!Jake_Rosenfeld said:Hi @john_hackington
"Part pattern" and "Face pattern" should be very fast. Are you using "Feature Pattern"?
Nope, I'm positive that I'm using "Face pattern". An example could be seen in the document below:
https://cad.onshape.com/documents/e3a279a3a61f9eb98e166e1d/w/968bf2f032f637f35846302a/e/49a0e4e7ddd04ec75a83692e
It got so bad that the document just timed out at "Loading studio data" after I attempted the final "Face pattern". Lou kindly helped me come out with the sketch approach which was a speed booster and I was finally able to complete my design.
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