There’s a tension in furniture making between traditional joinery and modern production methods. CNC routing is resolving that tension in interesting ways.

I’ve spent the past year integrating CNC-cut joinery into my work. Here’s what I’ve learned about combining old techniques with new tools.

The Traditional Joinery Challenge

Hand-cut joinery is beautiful but time-intensive. A well-executed dovetail joint might take 30 minutes to an hour. Complex pieces with dozens of joints can consume days of careful work.

This creates a pricing challenge. Clients love the look and durability of traditional joinery, but the labor cost can push pieces beyond their budget.

What CNC Does Well

CNC excels at the precise, repetitive aspects of joinery:

Dovetails: Machine-cut dovetails can be indistinguishable from hand-cut versions. The router follows programmed paths with sub-millimeter accuracy.

Mortise and tenon: Extremely consistent mortises are CNC’s strength. The tenons can be CNC-cut or hand-fit to the mortises.

Box joints: Perfect for CNC—repetitive, precise geometry.

Complex joinery: Japanese joints, compound angles, and unusual geometries that would be extremely difficult by hand become achievable.

What CNC Doesn’t Do

CNC cuts the geometry. It doesn’t:

• Select the wood for grain and figure
• Assess each joint for fit
• Make micro-adjustments during assembly
• Apply the craft judgment that makes furniture feel right

The machine handles the mechanical precision. The maker handles everything else.

Workflow Integration

My current approach:

Design phase: Joint geometry is modeled in CAD alongside the overall piece. This forces early decisions about construction.

Programming: Joints are programmed as reusable templates where possible. A dovetail routine, once perfected, applies to any size drawer.

Cutting: CNC cuts all joint geometry in batches. Efficiency comes from processing multiple components together.

Fitting: Hand-fit each joint. CNC accuracy is high, but wood moves and variations exist. Test-fit, adjust if needed, mark for assembly.

Assembly: Traditional process—dry fit, glue-up, clamping, cleanup.

The Time Savings

On a recent chest of drawers with eight drawers and dovetailed cases:

Estimated hand-cut time: 16-20 hours for joinery alone

CNC approach: 2 hours programming, 3 hours machine time, 4 hours fitting and refinement

That’s roughly 9 hours versus 18—a meaningful difference that affects what I can offer clients at various price points.

Purist Concerns

Some traditionalists view CNC joinery as cheating. I understand the concern but disagree with the conclusion.

The value of traditional joinery isn’t the hand tool process itself—it’s the resulting joint that’s strong, beautiful, and built to last generations. If CNC achieves the same result, the method is less important than the outcome.

That said, I’m clear with clients about my methods. Some specifically want hand-cut joinery and are willing to pay for it. Others want the look and performance without the full hand-tool price.

Getting Started

If you’re considering CNC for joinery:

1. Start with simple joints: Box joints or basic dovetails. Master these before attempting complex geometries.

2. Invest in good tooling: Cheap bits produce poor results. Quality spiral bits make a significant difference.

3. Test extensively: Run test cuts in scrap before committing production material.

4. Build a library: Save successful joint programs. Your efficiency compounds as your library grows.

5. Maintain hand skills: CNC is a tool, not a replacement. Hand-cut joinery remains valuable for one-off situations and continued skill development.

The Hybrid Future

The most interesting work combines approaches: CNC precision where it helps, hand work where it matters, and craft judgment throughout.

This isn’t about replacing traditional techniques. It’s about having more tools available for creating excellent furniture.

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Exploring the intersection of traditional craft and modern technology in furniture making.