2 Replies Latest reply on Jan 12, 2015 11:49 AM by Carlos Moreno

    DXF Export Resolution

    Ben Rickman

      I am designing a part that uses an Equation Driven Curve spline as one of the surfaces (a gaussian to be exact), rotated about an axis for cylindrical symmetry. The machine shop would normally take my .prt file and export it to .dxf to load it into their CAM software for the CNC lathe. However, when they do so, SW breaks the spline into shorter strainght line segments, with varying length depending on the method in which I export it.

       

      So far we have tried several methods:

      1) Exporting the 2D sketch to dxf, which seems to have the worst resolution (about 0.125" line segments).

      2) Exporting the 3D part to dxf and removing the extra line segments in the DXF/DWG Cleanup window. Better resolution, but still not quite as fine as I would like (about 0.05").

      3) Redrawing the part in the CAM software. Ultimately the best resolution (up to 0.0001" if I wanted), but not ideal for future projects.

       

      So my question is this, is there a way to control the resolution of the dxf export function?

       

      How is SW chosing those short line segments? After playing with a couple of other geometries (I picker a function with tighter curves) SW seems to be able to make shorter lines for tighter radii. How it does it and why it can't use the same segment length throughout, I don't know.

       

      Finally, the CAM software might be able to import file types other than dxf, is there a better format to suit my needs?

        • Re: DXF Export Resolution
          Christopher Estelow

          Not sure if this will do it .....Did you try going into Tools - Options and then under the Document Properties tabs click Image Quality.  Try changing the resolution on the slider bar all the way to the right to see if this helps with the output.  Another thing to try is go to File - Save as and change it to dwg then at the bottom click on options.  You can try to check "High Quality dwg Export" and maybe try "Export all splines as splines".  If it is what you want you can then save the dwg as a dxf.  If none of them work try playing around with the settings to see if you canget something you can live with.

           

          Hope this helps!!

          Chris

          • Re: DXF Export Resolution
            Carlos Moreno

            I had a somewhat similar problem, which I talk about here:

            Re: Polygon representation of circles when exporting as DXF/DWG

            What I ended up doing was creating a drawing from the part file and exporting the 2d curve from there. The resolution is excellent, and my machinist is able to project the paths onto the part surface in his software to generate the 3d curves.