Laser Cutting for KnivesHow Does It Work?
Laser cutting is the go-to method for knifemakers who need precise blanks without tooling or minimum orders. This guide covers the physics, tolerances, compatible steels, and DXF preparation.
The Physics in 30 Seconds
A laser generates a coherent beam focused down to a spot of a few dozen microns. At this power density — up to 10¹⁰ W/cm² — steel vaporizes instantly. An assist gas continuously blows the molten material out of the cut.
Assist gas by material:
- • Nitrogen N₂ — clean cut on stainless, bright oxidation-free edges
- • Oxygen O₂ — faster on carbon steels, slight surface oxidation
- • Compressed air — economical option for lower-grade materials
CO₂ vs Fiber Laser — What's the Difference?
| CO₂ Laser | Fiber Laser | |
|---|---|---|
| Wavelength | 10.6 µm | 1.06 µm |
| Steel absorption | Moderate | Excellent (3–5×) |
| Speed (2–4 mm steel) | Slow | Fast |
| Stainless cut quality | Good | Very good |
| Operating cost | High | Low |
For knifemaking steels, fiber laser is the current standard. It's the technology used at VolcanBlades.
What Tolerances Can You Achieve?
- ✓Dimensional accuracy: ±0.05 to ±0.1 mm
- ✓Kerf width: 0.1 to 0.3 mm depending on thickness
- ✓Repeatability (series): < ±0.05 mm — the laser reads the same file identically
Heat-Affected Zone (HAZ)
On a steel like 14C28N, a HAZ of 0.1 to 0.3 mm is unavoidable at the cut edge. It's removed naturally during profiling and grinding.
Which Knifemaking Steels Are Compatible?
| Steel | Cuttability |
|---|---|
| 14C28N (Sandvik) | ✅ Excellent |
| N690 (Böhler) | ✅ Excellent |
| 440C | ✅ Good |
| XC75 / 75Cr1 | ✅ Good |
| D2 | ✅ Good |
| CPM-3V / M390 | ⚠️ Possible |
| Welded damascus | ❌ Not recommended |
14C28N Sandvik is the ideal steel: good fiber beam absorption and heat treatable immediately after cutting — no intermediate annealing required.
Laser vs Press vs Waterjet
| Laser Cutting | Press Cutting | Waterjet | |
|---|---|---|---|
| Tooling | None | Die €500–3,000 | None |
| Min. quantity | 1 piece | 200–500 pieces | 1 piece |
| Accuracy | ±0.1 mm | ±0.2 mm | ±0.1 mm |
| Heat-affected zone | 0.1–0.3 mm | None | None |
| Cost (< 50 pcs) | ✅ Low | ❌ High | ⚠️ High |
| For artisans | ✅ Yes | ❌ No | ⚠️ Rarely |
For any artisan knifemaker ordering fewer than 50 pieces, laser cutting is the only economically sensible choice.
How to Prepare Your DXF File
- 1Closed contours — no gaps in the blade or hole outlines
- 2No duplicate lines — the laser would pass twice
- 3Minimum hole diameter = sheet thickness (e.g. 3 mm sheet → min. Ø3 mm hole)
- 4No fills or text — cutting curves only
- 5Export as DXF R14 or R2000, units in millimeters
💡 Our DXF configurator automatically checks these rules on import and flags issues before production.
What Laser Cutting Can't Do
- —Thickness > 8–10 mm: cut quality degrades. Non-issue for knifemakers (2.5–4 mm).
- —Edge usable without rework: HAZ always requires light grinding before sharpening.
- —Bevel profile: the laser gives the 2D shape. Bevel grinding remains manual.
- —Very high carbon steels (> 1.5% C): micro-crack risk without preheating.
Frequently Asked Questions
Does laser cutting weaken the steel?
No, provided the HAZ is removed during profiling. Steel outside the HAZ is thermally unaffected.
Can you cut already-hardened steel?
Golden rule: always cut before heat treatment. High thermal cracking risk on hardened steel.
Does laser cutting leave burrs?
With fiber laser and N₂ on stainless: clean edges. Light deburring is still recommended.
Is there a minimum order?
No minimum at VolcanBlades. We cut from a single piece.
What's the lead time?
5 to 10 business days standard. Express option available on request.
Ready to Upload Your File?
14C28N Sandvik blanks, laser cut and heat treated under controlled N₂/H₂ atmosphere by knifemaking specialists.
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