9 Replies Latest reply on Aug 12, 2009 8:26 AM by 1-5G4UI3

    Can't Knit Surfaces

      Hi,

       

      I'm trying to knit the ribs on the attached file together and it just keeps on stopping with an error.

       

      Anybody got any ideas?

       

       

      Thanks,

       

      Stuart

        • Re: Can't Knit Surfaces
          Mark Kaiser

          From the SW help files:

           

          Use the Knit Surface tool to combine two or more faces and surfaces into one.

          Note the following about knit surfaces:

          • Edges of the surfaces must be adjacent and not overlapping.

          • Surfaces do not need to be on the same plane.

          • Select the entire surface body, or select one or more adjacent surface bodies.

          • Knit surfaces absorb the surface bodies you used to create them.

          • Create a solid body when the knit surfaces form a closed volume, or leave as a surface body.

           

           

          I beleive you're violating the first rule.  The outer surfaces of your box overlap the rib surfaces.  Try it with a two simple test surfaces, it still doesn't work.  Also, some of the edges of your ribs extend beyond the box.

           

          I'm not sure how to get all of the features you want into a single surface.

          • Re: Can't Knit Surfaces
            Phil Marra

            I dont think that can be done because knitting surfaces look for edges to knit at least that is how I understand it.

             

             

            UPDATE:

            I may indeed be wrong I am looking at some other issues that could be the problem

            • Re: Can't Knit Surfaces

              Stuart,

               

              I don't think there is anything wrong with your import or part. I might have misunderstood you or what you are doing, but the knit command can only perform a Knit where two or more surface body edges are in close proximity to one another. It looks like you're trying to knit your interior ribs with the interior wall - that is not possible with the knit or trim mutual command because the interior wall is continuous and does not topologically break where the rib/s are located. What you simply have to do is thicken the overall box and then thicken each of the ribs to merge it into the box. (see attached.)

                • Re: Can't Knit Surfaces
                  John Kreutzberger

                  Another way to go without thickening first may be to use the rib surface as a trim tool and trim the rest of the box with it. Then they would knit together?

                   

                  I must admit that I didn't look at the file, but if the box is a solid-what I suggested wouldn't work-if it is a surface then it should.

                    • Re: Can't Knit Surfaces

                      My main purpose was to run a FEA simulation and I managed to join the surfaces together in Solidworks simulation.  For some reason the first time I tried to bond them to the wall it wouldn't let me but it seemed to work when I tired it again, this solved my issue.

                       

                      Thanks for all your help,


                      Stuart