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Garbean10-Marble
10-Marble
February 6, 2025
Question

Filling body with lattices

  • February 6, 2025
  • 3 replies
  • 1827 views

Dear PTC Community,

 

I frequently encounter the following problem and I can't wrap my head around it. I'd appreciate if some of you experts would like to shed some light into the situation.

 

I am trying to fill a portion of a component with lattice structures. I have separated the part to be filled as a separate component (you can find the part attached to this post as .prt, .igs, .stp). I am using Creo Parametric 9.0, and it only allows me to fill the part with formula-based lattices. When I try to fill it with beam lattices (e.g., hexagonal, see screenshot), I get a feature error. I also attempted to cut the body from a lattice cube using a Boolean operation, but without success. I tried this with many similar bodys, and can not get it to work properly.

 

Does anyone have a suggestion as to why this is not working?

 

My lattice Options:

Option for hexagonal beam latticeOption for hexagonal beam lattice

 

Best regards,

Garbean

3 replies

Dale_Rosema
23-Emerald III
Dale_Rosema23-Emerald III
23-Emerald III
February 6, 2025

Have you checked this out?

 

https://community.ptc.com/t5/Creo-Parametric-Tips/Did-You-Know-Creating-Lattice-Features-with-Creo-4-0/ta-p/820099

 

    Dale_Rosema
    23-Emerald III
    Dale_Rosema23-Emerald III
    23-Emerald III
    February 6, 2025

    after searching on lattice:

     

    .... also:

     

    https://community.ptc.com/t5/3D-Part-Assembly-Design/Creating-your-own-lattices/m-p/757282

     

      G
      Garbean10-MarbleAuthor
      10-Marble
      February 7, 2025

      Thank you dale. I could not get it working with the shell method either, see my response below for further information.

      tbraxton
      22-Sapphire II
      tbraxton22-Sapphire II
      22-Sapphire II
      February 6, 2025

      This knife edge geometry is likely a problem. Try shelling out your model and then apply the lattice following the method that @Dale_Rosema posted.

       

      tbraxton_0-1738846515251.png

       

        G
        Garbean10-MarbleAuthor
        10-Marble
        February 7, 2025

        Thank you for your input. The Knife edge is crucial in this design and can not be avoided. I have, however, tried  the above mentioned method on a similar geometry that does not contain a knife edge without success. I assume this is the limits of the complex calculation required behind creating these lattices.

         

        All the best,

        Garbean

        Dale_Rosema
        23-Emerald III
        Dale_Rosema23-Emerald III
        23-Emerald III
        February 7, 2025

        I do not have a lot of experience with lattice structures, but could you initially stop short of the knife edge and after adding the lattices, add the knife edge back to the part? Just a suggestion.

          P
          ProFeature16-Pearl
          16-Pearl
          February 16, 2025

          Is this checked in the cell's settings?

          ProFeature_0-1739735573186.png

           

           

            G
            Garbean10-MarbleAuthor
            10-Marble
            February 18, 2025

            A good idea, thank you for your reply. I have tried with the box checked and it ends the process without an error now. However, the result is not statisfying. Multiple lattices are missing.

            I am coming to the conclusion, that this is a program limitation and the task is too complex to calculate because of the winding surfaces of the target body.

            Garbean_0-1739867288397.png

             

            Y
            YY11003278810-Marble
            10-Marble
            February 24, 2025

            Hi @Garbean 

             

            @tbraxton  drew your attention to the fact that you have knife-edge geometry, and you are drawing a (wrong) conclusion about Creo's capabilities.
            Notice that you're attempting to fit a 3x3x3 mm grid into a space that can only hold 1.8-2.2 mm.

            YY110032788_0-1740381127221.png

            Furthermore, I don't understand why the lattice is required to reach the blade's tip rather than remaining a solid that maintains the entire geometry. Even assuming this is the design intent, I'm not sure how you'd print such a part with such a thick lattice, let alone the issues that would arise from adding the ball at the cell nodes. Judging by the geometry, this appears to be an academic activity.

            I recommend that you discuss this with your supervisor.

             

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