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23-Emerald III
BenLoosli23-Emerald III
23-Emerald III
April 6, 2015
Question

Corner blend

  • April 6, 2015
  • 6 replies
  • 15391 views

We are trying to model a blend on the corner of a box.

The edges of the box are square, with no blending.

Imagine taking a box and using a belt sander to only radius the corner.

How do you model this transition in Creo2?

    6 replies

    T
    23-Emerald IV
    TomU23-Emerald IV
    23-Emerald IV
    April 7, 2015

    Use SolidWorks. (I'm not joking.) It's really hard to get a decent looking corner like this in Creo (with or without radii on the edges.) I've opened cases on this in the past with tech support and they couldn't figure out a good way either.

    If you are willing to have some kind of radius on each edge, even a small one, you can switch the round to transition mode, pick the corner transition, and then change it to "corner sphere". Unfortunately this "dips in" in a non-realistic way (if belt sanding for example).

    vr2.PNG

    A different approach might be to use surface copies and vertex rounds to cut back the corners:

    vr.PNG

    Unfortunately I've never been able to get a patch to work to close it back up. Probably due to the topology as mentioned here: Vertex fillet | SOLIDWORKS Forums

    R
    rohit_rajan15-Moonstone
    15-Moonstone
    April 7, 2015

    solidworks also gives the same solution.

    in creo it is a corner sphere transition.

      Patriot_1776
      Patriot_177622-Sapphire II
      22-Sapphire II
      April 7, 2015

      I can't take credit for this, I ran across the technique here years ago if I remember. The only change I made was using conics for the 2 guide curves and the section curve. I think it smooths things out even a little more (though simple arcs looked fine), plus then you can change the shape of the "radius".

      ROUNDS-01.JPG

      T
      23-Emerald IV
      TomU23-Emerald IV
      23-Emerald IV
      April 7, 2015

      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.

      B
      23-Emerald III
      BenLoosli23-Emerald IIIAuthor
      23-Emerald III
      April 7, 2015

      The designer got something reasonably close to what he wanted by putting a chanfer on the part corner and then applying a radius blend the the edges of the triangular chamfer. The part corner blend is really going to be 'made' on a belt sander, so this was close enough.

      Thank you all for the suggestions and techniques that we can add to the 'tool box' for the next time a challenge blend comes along that cannot be fudged.

      Patriot_1776
      Patriot_177622-Sapphire II
      22-Sapphire II
      April 7, 2015

      So, is the question "answered"?

      D
      Darek1-Visitor
      1-Visitor
      April 7, 2015

      Played with this problem some time ago.

      Creo 2.0 model attachedpic.JPG

        T
        23-Emerald IV
        TomU23-Emerald IV
        23-Emerald IV
        April 7, 2015

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

        R
        rubenvillarreal14-Alexandrite
        14-Alexandrite
        April 9, 2015

        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.

        1.png3.png

        4.png

        5.png

        6.png

        I
        Inoram14-Alexandrite
        14-Alexandrite
        April 13, 2015

        I am reading this thread for the first time and wondering what the final geometry turned out like? In other words, it seems like every solution more or less fit the description of "belt sanding a corner".

        T
        TomD.inPDX17-Peridot
        17-Peridot
        April 14, 2015

        I think the result is that we -really- need a Sandpaper/Rasp/Grinder feature

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