Corner blend

[TomU]

Frank, it really looks nice. Basically the same technique as Antonius, but without the center trajectory. The advantage of your method is that Creo will gladly split it with a plane down the middle. The full circle method didn't allow this.

I'm still amazed that Creo makes the surface with the arc length going to zero.

[dkozuch]

Played with this problem some time ago.

Creo 2.0 model attached

[TomU]

Frank, there seems to be something unstable to this sweep. I went back to build a UDF for future use, and as soon as I change sizes either the sweep or the solidify fails. I then went back to your model and changed the cube to 2" and immediately your sweep failed as well. I tried changing accuracy but that didn't make any difference. Any ideas?

[TomU]

Curious why you chose a conic arc for the sketches. Is the RHO value of .410 significant?

[TomU]

So do any of you know how this technique could be adapted to work if you DO want a radius on each edge? I imagine the edge radii could either already exist or possibly be created as part of these features. There is also a possibility that each edge radius could have a different value.

[FrankSSchiavone]

Rho value of sqrt(2) - 1 (truncates as .414-ish) gives a true circle, anything above or below that gives an ellipse, a parabola, or a hyperbola..

You could piece together an n-sided mesh to do what Antonius showed, basically like this:

[rohit_rajan]

agreed solidworks does good job in this case.

the "Fill Surface" tool in solidworks does it nicely.

[FrankSSchiavone]

I'll look at it. I played with the rho value and it worked fine....except for a value of .6, for some reason. Didn't have time to really monkey with it. Try replacing the conics with simple arcs. I changed them to conics because conics are more truly tangent, and work better for surfacing.

Yes, you can drive a surface TO zero, but not FROM zero. Also, you cannot have an arc radius go to infinity (become a line segment).

[FrankSSchiavone]

I didn't bother making a relation in the cube itself, so when you tried to change a value to 2, it failed because one leg of the cube was 1", the other was 2", and I set up the curves to be 1/2 the length of the leg. Easy fix with a relation. Or you could assign a hard number for the distance, which is what I'd do if making a UDF. I played with it, and it seems pretty stable with regards to changing rho values, except when you get to .1, then it gets a little funny in the one corner when zoomed WAY in where the VSS section goes to zero. And occasionally it doesn't like a rho value of .6, but that seems intermittant. You can sneak up on it.

[rubenvillarreal]

Two step solution,

Use a variable round and use the add radius option and place these points between the corners, now give them a tiny value. Next, you can use the corner sphere transition and that's it.

The model was created in Creo Parametric 2.0 Student Version, sorry for that.

Look this dice.