How to Prepare a DXF File for Steel Plate Cutting
DXF is the most common file format for steel plate cutting. CNC machines read it directly. Send basic project requirements first through the contact form — prepared DXF, DWG, PDF, STEP, STP, or ZIP files are shared later by email attachment after your inquiry is received, not through on-page upload.
Why DXF Is the Preferred Format
DXF (Drawing Exchange Format) is read directly by CNC cutting machines without conversion. Geometry is preserved exactly as drawn. No manual redrawing, no interpretation errors.
When a buyer sends a clean DXF by email after the initial inquiry, manual quotation review is faster and production setup is smoother. A DXF supports evaluation — it is not an instant quote or automatic production commitment.
Basic DXF Requirements
- Units: millimetres. This is the most common error. A file drawn in inches at 1:1 scale will produce parts 25.4× the intended size when read as mm.
- Closed profiles. Every cut outline must be a closed loop. Open profiles produce incomplete cuts.
- No overlapping lines. Duplicate geometry at the same position causes the machine to cut the same path twice.
- One part per file, or clearly separated parts on different layers.
Layer Setup Best Practices
Separate cut lines, interior holes, annotations, and dimension lines onto different layers. Name layers clearly: "CUT", "HOLES", "NOTES".
Mixing cut geometry with dimension lines on the same layer forces manual cleanup before programming. This adds time and introduces risk of missing features.
Annotating Holes and Interior Cuts
Interior holes must be drawn as closed circles or profiles — not as centre marks or cross-hairs. The machine follows the geometry; it does not interpret symbols.
For tapping, mark threaded holes separately in your notes or a separate layer. The CNC drills the pilot hole; tapping is a secondary operation. Confirm M-size and depth at quotation stage.
Tolerance Information in DXF
DXF files do not carry tolerance information. The file shows geometry, not allowable deviation. Critical tolerances must be communicated separately — in an accompanying PDF, in the email, or in the order notes.
If no tolerance is specified, standard cutting tolerance depends on process and thickness — for example ±0.1 ~ ±0.3 mm for laser on thinner plate and wider ranges for flame-cut thick plate. Do not assume ±0.1mm on thick flame-cut plate. State critical tolerances explicitly in your email or accompanying notes.
Other Accepted File Formats
| Format | Accepted | Notes |
|---|---|---|
| DXF | ✓ Preferred | CNC-ready, fastest processing |
| DWG | ✓ | AutoCAD native; export to DXF if possible |
| ✓ | Manual redraw required; add extra time | |
| STEP / STP / IGS | ✓ | For 3D confirmation; 2D projection needed for cutting |
| ZIP | ✓ | Bundled DXF, DWG, PDF, STEP, or STP packages by email attachment |
| Hand sketch | ✓ | Dimensioned sketch with material and thickness noted |
Common Mistakes to Avoid
- Drawing in inches, sending as mm — always confirm units before export
- Open contours at line endpoints — zoom in and check join points
- All geometry on a single layer including dimensions and notes
- Multiple parts in one DXF without separation — use separate files or layers
- Sending only a rendered PDF without tolerances annotated
Prepare Your DXF Before Quotation
Start with material, thickness, quantity, destination, application, and process requirements through /contact/#quote-form. Drawing files are not uploaded on this website. After your inquiry is received, share your prepared DXF or other files by email attachment.
For confidential projects, NDA-based handling or simplified drawings can be discussed before full files are sent. There is no instant quote or guaranteed delivery promise on this site.
Steel plate cutting capability → · Flame cutting capability → · Quotation process →