Jul 292015
 

Putting together the 3D CAD model of a General Electric has been complex but straightforward… but hammering the 2D diagrams made from it into shape has proven a bit challenging. Most of the 2D work is done in an ancient version of AutoCAD, but there was something about the diagram (created in Rhino 3D) that caused ACAD to either lock up or crash. So finalizing the diagram has been done in Rhino, which means the diagrams will look a little different.

test2

 Posted by at 11:25 pm
  • Jordan

    Oh sweet! When you think the diagrams are going to be out in an US Spacecraft Projects issue? Would you consider doing an article on Brilliant Pebbles too?

    • Bibidiboop

      Or a unified space war issue covering as many anti-missile and anti-sat weapons as possible. That would be fantastic.

  • Interesting that I just took a look at the NASA Lewis summary report on the Space Power Architecture Study, and the GE slides reproduced therein have a little logo with an outline of this railgun sat. Cute.

  • se jones

    Well get to work Lowther.

    image below: The Hermes

  • se jones

    BTW, your Rhino 2D files have too many nodes for your old AutoCAD.
    Open these monster files in DraftSight or SolidEdge 2D (both free), then use the convertpoly, weed, cleanup or Tools: Remove Duplicates after flattening DXF file.

    Or, use MeshLab (also free and totally AWESOME software) to open the Rhino 3D file, then use MeshLab tools like /quadric based edge collapse/ to simplify the vertices then export the mesh to DXF.

    • Scottlowther

      > Open these monster files…

      Not that large, actually. I’ve successfully worked with *far* larger 2D CAD files. The Messiah 2D diagram is much bigger than the Have Sting 2D CAD diagram, and it didn’t provide trouble like this. There’s just something in there somewhere that ACAD just doesn’t like.

      > in DraftSight or SolidEdge 2D (both free), then use the convertpoly,
      weed, cleanup or Tools: Remove Duplicates after flattening DXF file.

      I downloaded the “free” version of DraftSight back in January after your recommendation. It worked great for thirty days, then it barfed up “if you want to keep using this, pay up” message. I just fired it up again, this time resetting the clock on my computer to January, and it ran again. Yay! I looked for “convertpoly,
      weed, cleanup or Tools: Remove Duplicate” commands, but it doesn’t have them. The closest it seems to have is Modify – DiscardDuplicates, which seems to be the right thing. But guess what: “DISCARDDUPLICATES is a premium feature blahblahblah pay up.”

      Meshlab seems to be something for dealing with 3D meshes, not 3D CAD models or 2D diagrams.