Prepare Vector Files for CNC in CorelDRAW

Preparing vector files for CNC routers in CorelDRAW requires optimizing paths, ensuring geometry is closed, and exporting the artwork in a machine-readable format. This guide covers the essential steps to prepare clean vector files, including setting up proper units and scaling, converting text and strokes to curves, closing unjoined nodes, eliminating duplicate vectors, organizing cuts by layers, and exporting to DXF or SVG formats for seamless CAM software importing.

1. Set the Correct Scale and Units

CNC routers operate on precise real-world dimensions. Before drawing or modifying artwork:

  • Open CorelDRAW and set the document units to match your CAM software and material specifications (typically millimeters or inches).
  • Always design at a 1:1 scale. Avoid scaling down artwork to fit the page; instead, resize the drawing page to accommodate the physical dimensions of the workpiece.

2. Convert Text and Outlines to Curves

CNC controllers cannot interpret live text fonts or outline stroke widths; they only recognize vector paths.

  • Convert Text: Select all text elements and press Ctrl + Q (or go to Object > Convert to Curves). This turns text into vector shapes and prevents missing font errors.
  • Convert Outlines: If your design uses thick outlines to represent cuts, select them and press Ctrl + Shift + Q (Object > Convert Outline to Object). Alternatively, assign outlines a Hairline thickness to represent a single center-line cut path.

3. Join Nodes and Close All Paths

Open paths cause errors in CAM software when generating pocketing or profile operations.

  • Select the shape using the Shape Tool (F10).
  • Check for disconnected nodes. To join them automatically, select the entire object and navigate to Object > Join Curves.
  • Set an appropriate gap tolerance (e.g., 0.1 mm) and click Apply to ensure all outer boundaries form continuous, closed loops.

4. Remove Duplicate Vectors and Overlapping Lines

Duplicate or overlapping vectors cause the CNC machine to cut the same path twice, damaging the material and dulling bits.

  • Use the Weld tool (found in the Property Bar or under Object > Shaping > Weld) to combine intersecting shapes into a single outline.
  • Use the Virtual Segment Delete tool to trim away unwanted internal lines.
  • Verify there are no duplicate lines stacked directly on top of each other by checking the Objects Docker (Window > Dockers > Objects).

5. Organize Cuts by Color or Layer

Grouping different types of machining operations simplifies toolpath assignment in CAM software.

  • Assign distinct colors or layers to distinct operations: for example, Red for inner cutouts, Blue for pockets, and Black for outer profile cuts.
  • Ensure colors are set to Hairline width so the CAM software reads them as pure vector trajectories.

6. Export the File for CAM

Once the vector geometry is clean, export it to a format compatible with your CNC software (such as Vectric Aspire, Fusion 360, or Carbide Create).

  • Go to File > Export and choose AutoCAD DXF (.dxf) or SVG (.svg).
  • For DXF export:
    • Set the export version to an older release (such as AutoCAD R11/R12 or R14) for maximum CAM compatibility.
    • Set Export Units to match your design units (Inches or Millimeters).
    • Ensure Curves are exported as Polylines or Splines depending on your CAM software's preference.
    • Check Export text as curves as a final safeguard.
  • Click OK to generate the production-ready file.