DXF for Laser Cutting: Units, Scale, and Import Checks
A DXF file can contain clean vector entities and still cut at the wrong size, duplicate a contour, or fail to close a path. Run this preflight before sending artwork to a laser.
1. Confirm units and physical size
Ask what units the cutter expects, then check the imported bounding box. A drawing that imports as 254 units when the original is 25.4 mm usually means the software interpreted millimeters as inches. Set units before moving or scaling entities.
2. Measure a known dimension
Add a small test rectangle with an explicit width and height, or measure a feature that should be exact. Do not rely on the zoomed preview. Compare the software measurement with the intended physical dimension before enabling the laser.
3. Inspect contour quality
- Open paths: identify endpoints that do not connect.
- Duplicate contours: stacked lines can burn the same edge repeatedly.
- Tiny fragments: remove dust-sized shapes that create stray cuts.
- Sharp reversals: simplify noisy corners that reflect the source pixels.
- Layer intent: separate engrave, score, and cut operations if the software supports it.
4. Dry-run the toolpath
Use the software's preview or travel simulation, with power disabled. Watch the order of operations, inner cuts before outer cuts, and any unnecessary travel across the material. The preview is not a substitute for a small physical test on the same material and settings.
Quick preflight table
| Check | Pass condition |
|---|---|
| Units | Match the cutter and the drawing's intended measurement system. |
| Scale | A known dimension measures correctly after import. |
| Contours | Closed, non-duplicated, and free of pixel-scale fragments. |
| Operations | Cut, score, and engrave geometry are intentionally assigned. |
| Simulation | Travel order is sensible and inner paths precede the outer boundary. |
From a photo or scan to DXF
pic2svg traces a raster image on its hosted service and provides a DXF export for the production workflow. The conversion is not a substitute for the checks above: compare the traced geometry with the source, then verify units and scale in the laser software. Its raster-to-vector benchmark documents the measurement method used to compare vector output.