Polygonal surface

Dega

Sorry for the dumbest question ever, had a look in the forum without success.
How can I get a simple polygonal surface?
For ex. I sketch an hexagon and I want a closed polygonal surface with no thickness.

rbaek

Dega said:

Sorry for the dumbest question ever, had a look in the forum without success.
How can I get a simple polygonal surface?
For ex. I sketch an hexagon and I want a closed polygonal surface with no thickness.

Let's first start with the sketch:

From here, click on Extrude. In the Extrude dialog, select the Surface option and select the edges of the hexagon:

After selecting them, adjust the extrude type and depth. You will have your hexagon as a surface:

chris_8

rbaek said:

Dega said:

Sorry for the dumbest question ever, had a look in the forum without success.
How can I get a simple polygonal surface?
For ex. I sketch an hexagon and I want a closed polygonal surface with no thickness.

Let's first start with the sketch:

I was hoping for a slightly different answer to this question.   Sometimes I'd like to have a  surface in a certain shape (like maybe the shape of a flat hexagon).   

How can I turn that hexagon into a single flat surface (one that's listed as a surface on the left sidebar)

DriesV

Split with surfaces does the trick.
https://cad.onshape.com/documents/57487900676117b665eb1216/w/aab023256785150a9d8954d0/e/4fe478616ee226b05fe15f33

A planar surface feature would be nice. 

Dries

chris_8

Thanks @DriesV !   That's useful .   The idea of extruding a line symmetrically to create the planar surface is something I wasn't coming up with myself 

NeilCooke

Hi @Dega  - can I ask how you will use this feature? You should always work with solid bodies where possible.

DriesV

NeilCooke said:

Hi @Dega  - can I ask how you will use this feature? You should always work with solid bodies where possible.

I tend to use planar surface geometry for rendering in KeyShot. They are very useful as geometry for area lights, because then you can define whether the light should output from the front and/or back from the surface. You can't do this with solids.

Dries

philip_thomas

Nothing like a good challenge! Behold my polygonal surface

https://cad.onshape.com/documents/a3ef2793d6f93b6b8c88d173/w/a25db7e050d47b3b4dea36fc/e/afe6505ebf43f7f4397b0b86

DriesV

I created an even simpler version. 
https://cad.onshape.com/documents/57487900676117b665eb1216/w/aab023256785150a9d8954d0/e/cc08441dd4695b6e099c5333

Dries

Dega

NeilCooke said:

Hi @Dega  - can I ask how you will use this feature? You should always work with solid bodies where possible.

I wanted to achieve this.
Thanks for the answer but I was hoping for something simpler

Narayan_K

@ Dega , I created Surface as DriesV  mentioned and patterned it as below,


https://cad.onshape.com/documents/52cc9108ce78e7f5e3a55619/w/cccd532887439925da9f8b9f/e/5468dd3d342230c3fbd2474a

Dega

DriesV said:

I created an even simpler version. 
https://cad.onshape.com/documents/57487900676117b665eb1216/w/aab023256785150a9d8954d0/e/cc08441dd4695b6e099c5333

Dries

How did you use the edges of the extrusion as reference?

Narayan_K

@ Dega , Use Extrude end condition as "Up to next".

Dega

philip_thomas said:

Nothing like a good challenge! Behold my polygonal surface

https://cad.onshape.com/documents/a3ef2793d6f93b6b8c88d173/w/a25db7e050d47b3b4dea36fc/e/afe6505ebf43f7f4397b0b86

Thanks but I have no idea how you achieved that.
I tried to loft the edges with the central point but the model disappeared.

DriesV

Dega said:

philip_thomas said:

Nothing like a good challenge! Behold my polygonal surface

https://cad.onshape.com/documents/a3ef2793d6f93b6b8c88d173/w/a25db7e050d47b3b4dea36fc/e/afe6505ebf43f7f4397b0b86

Thanks but I have no idea how you achieved that.
I tried to loft the edges with the central point but the model disappeared.

I you look closely then you can see the point for the loft was put on a plane with a tiny offset.
Technically, this is not a hexagon, as it is not a single flat face. These are rather 6 triangles glued together at a very shallow angle.

Dries

NeilCooke

Create your polygon sketch, create two more sketches on the same plane, and "use" one side of your polygon in each, then loft between. Simples.

rbaek

I see, I misunderstood the question. Sorry for the confusion.

Dega

Narayan_K said:

@ Dega , Use Extrude end condition as "Up to next".

@Narayan_K understood, but I meant how can I draw the line using the edges as external reference?

edit.
I managed to do it, but is not a part and I cannot use it in assembly.

Dega

NeilCooke said:

Create your polygon sketch, create two more sketches on the same plane, and "use" one side of your polygon in each, then loft between. Simples.

@NeilCooke
your solution seems pretty easy! I will give a try!

edit:
I managed to do the same, but I cannot get a part out of it and then I cannot use the file in an assembly. Is there a workaround?
https://cad.onshape.com/documents/1c8dd6954290ff5ef4ba383f/w/debdbd6dc7c15543b2583ac3/e/1287456660024ee7f47c9140

NeilCooke

Currently you can't knit surfaces together and you can't turn surfaces into a solid (and you can't use surfaces in assembly). Thicken each surface by a small amount then boolean the resultant solids together.