Supplier selection guide

How to Choose a CNC Fiber Laser Cutting Supplier

This guide is written for engineers and sourcing teams who need cut metal blanks, brackets and enclosures without gambling on quality. Read it and you can judge whether a cnc fiber laser cutting supplier fits your part, your tolerance and your schedule.

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±0.005 mm machining toleranceNo minimum order quantityISO 9001 / IATF 1694912-hour quote

CNC fiber laser cutting supplier equipment cutting a metal sheet

On this page

1
Key takeaways
2
Laser cutting versus other cutting methods
3
What a cnc fiber laser cutting supplier actually controls
4
Which metals cut well, and which do not
5
Tolerance, thickness and the limits of laser cutting
6
How to qualify a cnc fiber laser cutting supplier
7
Step by step: from drawing to delivered cut parts

Quick verdict

Key takeaways

Power sets the ceiling2–6 kW covers thin sheet cheaply; 8–20 kW cuts thick plate faster and lowers cost per part.

Cut edge is not the finished edgeLaser leaves a heat-affected zone. Tight bores and sealing faces still need machining or reaming.

Thickness decides the processAbove roughly 20 mm in mild steel, plasma, waterjet or machining often wins on total cost.

Ask for the inspection recordA credible supplier shows first-article data and a 100% inspection step before shipment.

Small lots are a real testNo minimum order quantity reveals whether a shop is set up for prototypes or only for volume.

Decision table

Laser cutting versus other cutting methods

Use this table when the drawing is not yet released for cutting.

Process	Best thickness range	Edge and tolerance	Watch out for
Fiber laser, 2–6 kW	0.5–6 mm mild steel	Clean edge, ±0.1 mm typical	Slow on thick plate
Fiber laser, 8–20 kW	6–20 mm mild steel	Clean edge, faster cut	Higher machine rate
Waterjet	10–100 mm any metal	No heat-affected zone	Slower, abrasive cost
Plasma	12–50 mm carbon steel	Rougher edge, needs cleanup	Wider kerf, more dross
CNC milling	Any, from billet	±0.005 mm achievable	Higher cost per part
Stamping	0.3–3 mm sheet	Very consistent at volume	Tooling cost, long setup

Matching process to part

What a cnc fiber laser cutting supplier actually controls

A fiber laser focuses a 1,070 nm beam onto a spot a few tenths of a millimeter wide. The metal absorbs that wavelength well, so the cut runs fast and the kerf stays narrow. What the supplier controls is not the physics, it is the setup around it: nozzle size, focal position, assist gas pressure and feed rate.

Those four settings drive the result you see on the edge. Oxygen assist on mild steel gives an oxidized, slightly rough edge but cuts thick plate efficiently. Nitrogen assist gives a bright, oxide-free edge that welds and paints better, at higher gas cost.

A good supplier will ask what happens after cutting. If the part gets welded, nitrogen is usually the right call. If it gets painted or powder coated, a light oxide layer may be acceptable and cheaper to produce.

Read the cut edge before you read the quote. Dross on the underside, a wide heat-affected zone or a tapered kerf all mean the parameters were set for speed, not for your next operation.

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Kerf widthTypically 0.1–0.3 mm depending on power and material.
2
Heat-affected zoneUsually under 0.2 mm on thin sheet, wider on thick plate.
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TaperThicker plate cuts with more taper; reaming fixes critical holes.
4
Micro-hardnessThe cut edge hardens slightly, which matters before tapping.

Materials

Which metals cut well, and which do not

Mild steel, stainless steel, aluminum and brass all cut on a fiber laser. Copper and brass need higher power because they reflect the beam at room temperature, so a 6 kW machine handles thin brass far better than thick plate. Aluminum cuts cleanly but leaves a rougher dross than steel at the same thickness.

Reflective and highly conductive metals are where suppliers separate. A shop that lists beryllium copper, C101 or C110 copper in its material list has dealt with back-reflection protection and beam alignment. A shop that only lists 6061 aluminum has not.

Carbon fibre and plastics do not belong on a fiber laser. Carbon fibre can be cut on some systems but leaves a charred edge and airborne dust, and most shops route it to machining or waterjet instead. ABS and POM release fumes that damage optics, so they go to CNC routing or milling.

If your part mixes metals, say so early. A stainless bracket welded to a mild steel plate needs both cuts planned for the same edge condition, or the weld prep will not match.

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Cut cleanlyMild steel, stainless 303/304/316, aluminum 5052/6061, brass C36000.
2
Needs careCopper C101/C110, beryllium copper, titanium, Inconel.
3
Route elsewhereCarbon fibre, ABS, POM, PMMA, PEEK.

Tolerance and finish

Tolerance, thickness and the limits of laser cutting

Laser cutting holds roughly ±0.1 mm on thin sheet and looser tolerances as thickness climbs. That is fine for brackets, covers, gaskets and weldments. It is not fine for bearing bores, dowel holes or sealing faces, which is why those features are usually machined after cutting.

This is where a supplier with both laser and CNC machining under one roof saves you a step. At GreatLight, cut blanks move to 3-axis, 4-axis or 5-axis machining centers for hole reaming, face milling and tapping, holding ±0.005 mm where the drawing calls for it.

Thickness is the other limit. A 20 kW laser cuts 20 mm mild steel, but the edge quality drops and the machine rate rises. Past that, waterjet or plasma is often cheaper per part, and if the feature is a precision bore, milling from solid removes the whole tolerance problem.

Ask what the supplier does when the drawing is at the edge of the process. A useful answer names a thickness, a tolerance and an alternative process. A vague answer means they will cut it anyway and let you find the problem at assembly.

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Good for laserBrackets, covers, gaskets, panels, weld preps.
2
Machine after cuttingBearing bores, dowel holes, sealing faces, threads.
3
Wrong processThick plate with tight bores, hardened tool steel.

Supplier checks

How to qualify a cnc fiber laser cutting supplier

Start with the certifications that match your industry. ISO 9001:2015 covers general quality management. IATF 16949:2016 is what automotive and EV programs expect. ISO 13485:2016 applies to medical devices, and ISO 27001:2022 covers information security if your drawings are sensitive.

Next, ask how the shop measures. A supplier that inspects with calipers only will struggle with a ±0.05 mm profile tolerance. A supplier with CMM or optical inspection can prove the first article and repeat it at volume. Ask for the inspection report format before you place the order, not after.

Then look at the shop's range. A supplier that only cuts sheet cannot fix a hole that came out undersized. A supplier that runs laser, machining, bending, welding and finishing keeps the part in one queue. GreatLight covers 127 high-precision CNC machines across three plants, plus sheet metal fabrication, surface finishing and assembly.

Finally, check the commercial terms. No minimum order quantity means you can run one prototype and then a 10,000-part lot with the same supplier. Uploads stay confidential and an NDA is available on request.

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CertificationsISO 9001, IATF 16949, ISO 13485, ISO 27001.
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InspectionFirst article plus 100% inspection before shipment.
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Process rangeLaser, machining, bending, finishing under one roof.
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TermsNo MOQ, confidential uploads, NDA on request.

Sourcing workflow

Step by step: from drawing to delivered cut parts

Use this sequence to compare quotes on the same basis.

1
Send a 2D DXF and a 3D STEP fileDXF carries the cut profile; STEP carries bend lines, hole positions and any machined features. Missing one of the two is the most common reason a quote comes back with assumptions.
2
State material, thickness and finishGive grade and temper, for example 6061-T6 at 3 mm, and note whether the edge must be oxide-free. This decides assist gas and machine power.
3
Flag every tolerance that mattersMark the bore diameters, hole positions and flatness callouts that affect assembly. Everything else can sit at general tolerance and keep the cost down.
4
Ask for DFM feedback before the quote is finalA useful supplier will flag a hole smaller than the material thickness, a slot narrower than the kerf, or a corner radius that needs a relief cut.
5
Confirm the inspection planAgree on first-article inspection, in-process checks and a final report. For medical and automotive parts, name the report format up front.
6
Review the first article before the runCut one or two pieces, measure them, and confirm the edge condition. Adjusting parameters at this stage costs far less than scrapping a full lot.
7
Plan the secondary operationsReaming, tapping, deburring, bending, anodizing or powder coating should be scheduled with the cut, not left as an afterthought.

FAQs

Frequently asked questions

What laser power do I need for my part?

Power sets the thickness you can cut economically, not the quality you can reach. A 2–6 kW machine handles thin sheet at low cost per part. An 8–20 kW machine cuts thicker plate faster and reduces cost per part on heavy work.

Match wattage to your main material and thickness, then ask the supplier what edge condition that power gives on your specific grade.

Can fiber laser cutting hold ±0.05 mm?

Not on the cut edge alone. Thin sheet typically holds around ±0.1 mm, and thicker plate is looser. A ±0.05 mm profile callout usually means the part needs machining after cutting.

The practical answer is to laser cut the blank and then ream or mill the features that carry the tight tolerance.

Which file formats should I send?

DXF or DWG for the flat profile, plus STEP for the 3D part and bend information. PDF drawings help, but they do not replace the vector file.

If your CAD data needs cleanup, ask whether the supplier offers CAD support to close open contours and add relief cuts before cutting.

Is laser cutting suitable for thick plate?

It works up to roughly 20 mm in mild steel on a high-power machine, but edge quality drops and the machine rate rises. Waterjet or plasma is often cheaper past that point.

If the thick part also has a tight bore, cut the profile and machine the bore, or mill the part from solid.

How do I keep my design confidential?

Send files through the supplier's upload portal rather than email attachments, and confirm the shop's information security practice. GreatLight holds ISO 27001:2022 and offers an NDA on request.

Uploads stay secure and confidential, and the NDA can be signed before any drawing is released.

What is a realistic lead time?

At GreatLight, a quotation with free DFM analysis comes back within 12 hours, and production can start within 24 hours. Parts ship in 3–5 days once the first article is approved.

Historical late-delivery probability is below 2%. Add time for finishing steps such as anodizing or powder coating, which run in separate queues.