CNC routers and laser cutters have found a genuine foothold in the intarsia workshop — not replacing the craft, but changing the workflow in ways that free up more time for the parts that matter most.
CNC Workflow for Intarsia
A CNC-assisted intarsia project typically begins the same way as any other: with a pattern file. The difference is that instead of transferring the pattern to wood by hand, the SVG or DXF file goes directly into your CAM software (VCarve, Carbide Create, or Lightburn for laser). The machine cuts precisely to the digital line every time — no tracing error, no hand-wobble on the entry cut.
For intarsia, CNC shines on straight-edged geometric patterns, text-based designs, and repetitive identical pieces. The wolf howling silhouette in our scroll saw collection, for instance, cuts cleanly in a single CNC pass on ¼" Baltic birch plywood.
SVG File Preparation
Not all SVG files are CNC-ready. The key requirements are:
Closed paths: Every shape must be a fully closed vector path. Open paths confuse the toolpath generator and produce partial cuts. In Inkscape or Illustrator, use the "close path" function on every piece outline.
No overlapping paths: Overlapping outlines cause the router to cut the same line twice, widening the kerf unpredictably. Merge or subtract overlapping regions before export.
Kerf compensation: The CNC bit removes material equal to its diameter. For a 1/8" spiral upcut bit, add 1/16" outward offset to each piece outline so the cut parts fit together without gaps. Most CAM software includes a kerf compensation tool — use it.
Toolpath Settings for Wood
For ¾" hardwood intarsia pieces:
For laser cutters (Glowforge Pro on ¼" Baltic birch):
Material Thickness Considerations
CNC and laser cutters work best with consistent material thickness. Any warping causes the bit or laser to go out of focus partway through the cut, producing ragged edges. Flatten your blanks through a planer or drum sander before CNC work. For laser cutters, double-sided tape or a vacuum hold-down keeps warped sheet goods flat against the bed.
Most intarsia uses ¾" solid wood — at the upper limit of what desktop CNC routers can cut cleanly in a few passes. Half-inch stock is more CNC-friendly if your pattern allows it.
What CNC Cannot Replace
Here is the honest part: CNC addresses only the cutting step of intarsia, and cutting is not where the art lives.
Grain selection is entirely human. The machine cuts wherever you tell it to, regardless of whether a beautiful figure in the wood blank lands on the cardinal's red breast or disappears under a boring background piece. Walking to the lumber rack, rotating boards, and choosing which section of which board goes where — that is where experienced intarsia artists earn their reputation.
Elevation and shaping remain hand work. Routing the back of pieces to different heights, rounding over top edges, and undercutting for tight fits all require judgment and touch that no current CNC workflow automates.
Finishing is entirely manual — sanding through grits, applying oil, buffing — and this step affects the final appearance as much as any cutting decision.
The Hybrid Approach
The most productive use of CNC in an intarsia workshop is for the cut step only — freeing the maker to spend more time on grain selection, elevation, and finishing. Batch-cut a full pattern set while you sand and finish the previous project. The machine works while you work. That combination — digital precision for cuts, human judgment for everything else — is where CNC intarsia produces genuinely exceptional results.