perfect circles

When I create a circle in corel and export it as a DXF to TCPwin (the toolpath software for the laser)  and run it on the laser it is not smooth, there are straight segments.   If the same circle is produced by AutoCad and sent as a DXF  the laser produces a perfect smooth circles.  Can anybody tell me how to fix this problem in corel.  I use corel 11 and x3.

  • I tested this as best I could by creating a circle in CD X3 and then exporting as DXF. I brought the image back to Draw and then into Illustrator and then magnified to 6400% and I still have smooth curves.

    I brought the element into AutoCad and viewed and still have a smooth curve. Unfortunately I don't have the laser tool to test.  What version of AutoCad are you using? Have you tried different versions of the Autocad file on export and seen how they react?

    • The file always looks good on the screen, TCPwin only reads AutoCad 11 & HPGL and I have tried both.  It shows up on the machine when cutting more so in larger circles.  The odd thing is it cuts a smooth circle if it is created in AutoCad, there seem to be something in CD11 and x3 that does not smooth the cut.

      • If you exporting as an PLT file, try changing the curve resolution under the advanced tab to 0. I used to do this when exporting to a vinyl plotter as i was experiencing the same straight lines between nodes. Not sure if this will help but it cannot hurt to try.

         Regards

        • That seems to work a lot better thanks for the help.

          • Maybe I'm over looking this tab, but I can't find the advanced tab or the curve resolution.  Where is it located?

             Nevermind, tech called me back and I got it.

            •  Give Bezarc a shot.  We utilize it for smoothing out curves from our Corel files (exported first to .ai).  We saw a problem similar to yours with curves turning into a series of line segments, and we also saw lines that were joined in Corel, but the endpoints would no longer meet when they converted to dxf.  We had this problem in all corel versions through X3.

              We use routers and cutters, the problem was isolated to our routers.  When running a high node count (high count on the cruve because it was a series of segments, not a single arc) image through our machine, it significantly extended the length of a job.  A 4x8 sheet that should cut in a few minutes would easily take 30 to 45 minutes.

              http://www.kandusoftware.com/products/windows/bezarc.php?product=Bezarc