Last updated: 21 October 2026.
Direct answer. Laser cutting suits flat sheet parts that need no tooling: you send a drawing, the shop nests it, and the cut edge comes off the machine ready to bend. What decides the outcome is thickness, hole size against thickness, edge quality class and how the parts are deburred afterwards.
Laser cutting is the default first operation for custom sheet metal, and it is also the one where buyers most often compare prices that were never comparable. Two shops can quote the same drawing at very different numbers because they assumed different edge quality, different nesting yield, or different amounts of secondary work — and none of that is visible in the drawing.
This page is a procurement aid, not a machine capability sheet. It explains what the process does well, where the design decisions that drive cost actually sit, and what to put in the RFQ so the quotes you get back are answering the same question.
On the numbers. This page deliberately carries no cutting speeds, thickness limits, tolerances or prices. Those are specific to a machine, a material batch and a shop's own setup, and quoting them without a named source is how procurement pages mislead. Ask each supplier to state its own figures against your drawing.
Laser cutting removes material by melting and ejecting it along a programmed path. A focused beam moves over a stationary sheet, assisted by a gas that blows the molten material out of the kerf. Because the path is software, there is no tooling to make: the first part and the thousandth part cost the same to set up, which is why the process dominates prototype-to-mid-volume work and why it is usually the cheapest way to find out whether a design works.
The practical consequence for a buyer is that laser cutting is a two-dimensional operation. It gives you a flat blank with an accurate outline and holes. Anything three-dimensional — bends, countersinks, threads, welded assemblies — is a separate operation performed after cutting, usually by a different department or a different supplier. Quotes that bundle them into one line hide where the cost sits, and that is where revisions get expensive.
Flat parts with a clean outline, holes, slots and cut-outs, in sheet thicknesses the shop's machine can handle at the edge quality you need. Short runs and one-offs, because there is no tooling cost to amortise. Design revisions mid-project, because changing the program is trivial compared with changing a die. Parts that will be bent afterwards, provided the cut geometry leaves enough material where the bend line runs.
It is a poor fit for thick section, for parts where a rolled or forged form is structurally better, and for anything where the cut edge itself must be a sealing or bearing surface — laser edges are clean but they are not machined, and the difference matters when a face has to mate.
Mild steel, stainless steel and aluminium are the everyday materials. Galvanised and coated sheet cut acceptably but the coating is destroyed along the cut edge, so any corrosion protection on that edge has to be restored afterwards. That is a real cost and it belongs in the RFQ rather than in the surprise column later.
Aluminium and copper alloys are the materials that separate shops. Highly reflective metals return part of the beam into the optical path, which is a machine-safety and consumable-life issue, not merely a quality one. Shops handle it with different laser types and different assist gases, and some simply decline thin reflective work. When a supplier quotes aluminium at the same rate as mild steel without comment, that is worth a question rather than a discount.
Material certification is a separate matter from cutting. If your part needs a mill certificate traceable to the heat, say so at RFQ stage; the cutting shop may buy through a stockholder and pass on that stockholder's paperwork rather than the mill's.
Most of the cost difference between two quotes for the same part comes from geometry the drawing already fixes. Five items are worth reviewing before you send anything out.
Hole size relative to thickness. A hole much smaller than the sheet is thick is harder to cut cleanly; dross builds up and the hole may need drilling anyway. If the design needs small holes in thick material, ask whether the shop will cut or drill them, because the answer changes the price and the lead time.
Web width between features. Narrow strips of material between two holes, or between a hole and the part edge, are where distortion starts. Widening a web is usually free at design stage and expensive after the first batch warps.
Internal corners. A laser cannot cut a true sharp internal corner; it leaves a radius roughly the width of the kerf. If the mating part has a square corner, either the corner of the pocket gets a relief radius or the assembly will not close. Draw the radius you can live with rather than letting the shop choose.
Bend relief and bend lines. If the part is bent after cutting, the cut geometry and the bend line interact. Holes placed too close to a bend line distort when the material stretches; slots that cross a bend line behave differently again. Send the flat pattern and the formed view so the shop can see both.
Nesting and material utilisation. Sheet is bought by the sheet, not by the part. A design that nests badly wastes material that you pay for. Small changes — rotating a feature, aligning parts to a common edge, avoiding an awkward protrusion — can change yield more than a price negotiation will.
Four properties describe a laser-cut edge, and only one of them is usually discussed.
Kerf is the width of material removed. It is set by the beam and the gas, and it is why a cut part is slightly smaller than its nominal outline on the inside of a hole and slightly larger on the outside of a contour.
Taper is the difference between the top and bottom of the cut face. It is always present to some degree and it grows with thickness.
Dross is re-solidified material clinging to the underside. It is the defect buyers notice first, and the one that decides whether a part needs deburring.
Heat-affected zone is the thin layer of material whose microstructure the cut changed. On mild steel it is usually irrelevant; on heat-treated or stainless parts it can matter for corrosion resistance and for subsequent coating adhesion.
There are international classification systems for thermal-cut edge quality, and shops quote against them. The useful question is not "which class do you achieve" but "which class does your quote assume, and what does the next class up cost" — because the difference is usually a change in speed and gas, and it is priced.
| Method | Best fit | What it costs you |
|---|---|---|
| Laser cutting | Flat sheet parts, short runs, design still moving | 2D only; edge is not a machined surface; reflective metals need the right machine |
| CNC punching | High volume of the same flat part | Tooling cost per shape; design changes mean new tooling |
| Plasma cutting | Thicker plate, less demanding edges | Rougher edge, wider heat-affected zone, more finishing afterwards |
| Waterjet | Thick or heat-sensitive material, no thermal effect | Slower; abrasive and disposal costs; not the cheap option for thin sheet |
| Wire EDM | Hardened material, very fine detail, 2D profiles | Slow and priced per hour; the wrong tool for sheet work at volume |
The decision is usually made by volume and by what happens after cutting, not by which process is "better". A punching shop will beat laser on a stable high-volume part; laser wins as soon as the design is still being revised.
A quote is only comparable if the assumptions travel with it. Send the drawing as a dimensioned PDF plus a DXF of the flat pattern, and put these on one page:
| Specify | Why it changes the number |
|---|---|
| Material grade and thickness, and whether a mill certificate is required | Decides cutting parameters, and whether the shop buys certified stock or passes on a stockholder's paperwork |
| Edge quality class assumed, and whether dross-free is required | Quality class is bought with speed and gas; dross-free usually means a second operation |
| Whether parts are deburred, and by what method | Hand deburring and vibratory finishing are priced differently and finish differently |
| Whether the part is bent, and whether the bend is in this quote | Bending is a separate operation that is often left out to make a unit price look lower |
| Surface finish or coating after cutting | Decides how clean and how smooth the cut edge has to be before coating |
| Quantity per revision, and how many revisions are expected | Sets whether setup is amortised, and whether a tooling alternative becomes cheaper |
| Packaging and edge protection in transit | Bare stacked parts arrive with dented edges, and that is a claim, not a discount |
| Incoterm and destination port | Otherwise freight gets folded invisibly into the unit price |
| First-article report and sampling plan | Turns "passed inspection" into something you can check against the drawing |
Ask each supplier to state the cut quality assumption and the nesting yield separately. Two quotes that name those two numbers can be compared; two that do not, cannot.
For a first article, ask for a dimensional report against the drawing's critical dimensions rather than a general "passed inspection" statement. Photographs of the cut edge — top face, bottom face, and a cross-section at the thickest point — will tell you more about dross and taper than a certificate will.
For production, agree the sampling before the first shipment, not after the first complaint. The usual failure is not a bad first article; it is a good first article followed by a quiet change of material supplier in month three. If the part is safety-relevant, that is also where a factory audit earns its cost — see our guide to factory audits and to quality control for how to structure the checks.
Laser cutting is rarely the last operation. A typical custom sheet-metal part is cut, deburred, bent, welded if needed, and finished — and each step can undo the accuracy of the one before it. Our guides to sheet metal fabrication, tolerances and finishing cover how those steps stack. If the part is a machined component rather than a formed one, CNC machining is the better starting point.
For flat parts in sheet thickness, usually yes, because there is no tooling and no per-part machining time on a flat profile. The comparison changes once the part needs three-dimensional features, tight tolerances on a machined face, or threads — those are separate operations regardless of how the blank was made.
No. The beam leaves a radius of roughly the kerf width at every internal corner. If a mating part has a square corner, the design needs a relief radius in the pocket, and that radius should be on the drawing rather than left to the shop.
Most often because they assumed different edge quality, different nesting yield, or different amounts of deburring and secondary work. Ask both to state the cut quality class and the material yield; that usually explains the gap without a negotiation.
Yes, but it is not interchangeable with mild steel. Reflective metals return part of the beam into the optics, so shops use different machines, gases and settings, and some decline thin reflective work. A quote that treats aluminium as identical to steel is worth questioning.