Modeling cube corner

kevin_maple

Trying to model a rounded cube corner with filleted edges, and really struggling. Ive tried several approaches using lofting and no love. Any suggestions.

https://cad.onshape.com/documents/785bef234064036459e0d496/w/e7d9c438fd795b83b8fe40ea/e/f99f3da79e3018ae838fa845

Thanks,
km

philip_thomas

That was fun!
There are 100 people out there that will come up with strategies with fewer features - all are a great learning opportunity for you.
In this solution i was just having fun with our fill surface capability since you had made all of those nice sketches

https://cad.onshape.com/documents/dc4fa4994ba0eeef5698822a/w/ec0c1ead2d462339964ca78a/e/33afbc2ce40b6cc612a03e39

kevin_maple

Wow, this newbie was schooled. Thanks,

Jake_Rosenfeld

Hi Kevin,

Could you describe in more detail what you are trying to make? Are you trying to make a surface out of just the corner? are you trying to make a solid that is enclosed by the sketches you have drawn?

As a first pass I've just used a 'fill' feature on the inputs you posted to make the corner you sketched out:
https://cad.onshape.com/documents/c6a3075dff5f0176e6a891e5/w/917c6c07a2b9aa478b77d0bd/e/ba54125f57ea6c191eea8d99

p.s. be careful, your sketches are not fully defined, and contain some references to geometry that no longer exists.  This can cause issues with downstream features:
https://www.onshape.com/videos/dimensions-and-constraints

philip_thomas

That was fun!
There are 100 people out there that will come up with strategies with fewer features - all are a great learning opportunity for you.
In this solution i was just having fun with our fill surface capability since you had made all of those nice sketches

https://cad.onshape.com/documents/dc4fa4994ba0eeef5698822a/w/ec0c1ead2d462339964ca78a/e/33afbc2ce40b6cc612a03e39

Jake_Rosenfeld

Nice one Philip!

kevin_maple

Wow, this newbie was schooled. Thanks,

jon_sorrells

I know you already go a couple of answers, but I wanted to try modeling this as well.
I mostly used lofts, and then did a fill surface for the 'triangular' face in the middle of the corner.
https://cad.onshape.com/documents/48a93fb2b78ee88da5532e98/w/84aed00bfe7bae2c48716e78/e/e9dcdcddab40a27b06048216

paul_britton

Here's my take on it....

 A Filleted, Boolean intersection between a cube and a sphere...

The Sphere is derived from a seperate part studio purely becuse I had one already and I couldn't find the Featurescript feature that created it originally!

https://cad.onshape.com/documents/8e24cdfa67b295a0aafa250b/w/91684dee997f61da09fd4d9e/e/edd6448cc94fc87a07270cea

philip_thomas

OMG - this is the 'Dodecahedron Thread' all over again! 
I submit this 10 feature solution




https://cad.onshape.com/documents/e4ddba048df02e323847746b/w/5ece72b1f753aeaef8498f27/e/8adec580b0284d06709414bc

You're up John Sorrels

paul_britton

https://cad.onshape.com/documents/ddf12307609f81f73f0b3140/w/e574e66875fba0866b75b2b5/e/65dd0a0fba7f507a4b2da41a

roman_jurt190

hmm. i made one that has curvature continuity. but there seems to be a problem with the corners and i can't get the surfaces enclosed... any ideas?
but at least it's now easy to customize using side/edge/corner as variables:)
https://cad.onshape.com/documents/aace2c28cb66e447a31a1bb6/w/f0d219ecf00c3c963f2dda28/e/4bd4bc5ea4808887fca4bbfb

philip_thomas

@roman_jurt190 - Roman - nice model.
Those aren't errors - those are warnings (i know, the colors are way too close @andy_morris).
The warning says that you are trying to create a fill surface that is curvature continuous to two adjacent faces and while each bit of the surface along the edge can be curvature continuous, it cannot simultaneously satisfy the requirements of two faces that have two different curvatures. This condition arises at each of the 6 vertices (each touches two faces with different curvatures). The warning is simply saying that the request cannot be satisfied at those points.

roman_jurt190

thanks philip! if i change all the conditions to tangent, the warnings are gone:)
how would you approach curvature continuity with the tools available? (there is not much to find tutorial wise, or ist it?...
i played around some more and got the surface enclosed (changed the corner radius into splines...)

philip_thomas

@roman_jurt190 - because they are only warnings, i would say put it back to the way it was. It is impossible (in any system) to simultaneously satisfy two different requirements. Again, the warning is simply saying that (for each patch) that the two conflicting requirements are not satisfied at those two points.