How Thick Can a Laser Cutter Cut?

A laser cutter can cut materials ranging from thin sheets to thick industrial metal plates. Its actual cutting capacity depends on the laser type, power, material, and required finish. Desktop machines typically handle wood and acrylic, while industrial fiber systems can process much thicker metal.

Understanding these differences helps you choose equipment that matches your production needs.

Cutting Thickness by Laser Type

Diode Laser Cutters

Diode laser cutters are commonly used for crafts, model making, and small workshop projects. They can cut wood and certain opaque acrylics, but performance varies by material.

For example, xTool lists single-pass cutting capacities of up to 18 mm cherry wood and 15 mm black acrylic for its S1 40 W configuration. These are model-specific figures rather than universal limits for 40 W lasers.

Industrial Fiber Laser Cutters

Industrial fiber lasers are designed for metal processing. Certain TRUMPF 6 kW configurations list a maximum mild-steel thickness of 25 mm. Selected 24 kW configurations list up to 60 mm with a dedicated thick-sheet cutting package.

These capabilities depend on the exact machine and options. A steel-cutting specification should not be applied automatically to aluminum, copper, or brass.

What Affects Laser Cutting Thickness?

Laser Power

Higher power can enable deeper single-pass cuts within comparable systems. However, wattage alone cannot predict cutting capacity across different laser technologies.

Material Properties

Different materials respond differently to laser energy. Even wood products of equal thickness can produce different results. Always check specifications for the exact material rather than relying on a broad category such as “wood.”

Focus and Cutting Settings

Power, speed, and focus must suit the application. Simply slowing the machine does not guarantee a clean cut. Trotec notes that excessively slow acrylic cutting can widen the cut and increase fire risk.

Maximum Thickness vs. Usable Cutting Quality

Cutting completely through a sheet is only one measure of performance. A usable part must also meet requirements for edge finish, dimensional accuracy, and processing time.

When comparing machines, ask whether the advertised thickness represents a single-pass cut, a multiple-pass result, or a production-quality capability. Test your actual design, including small holes and corners, before committing to equipment.

Frequently Asked Questions

Can a laser cutter cut 25 mm steel?

Yes. Certain industrial laser systems support this thickness. Confirm the machine configuration, steel grade, and required finish with the supplier.

Does working height equal cutting thickness?

No. Working height indicates how large an object fits inside the machine. It does not indicate how deeply the laser can cut.

How should I choose the right capacity?

Specify your material, regular thickness, tolerances, and output requirements. Request sample parts and compare their quality, cutting time, and finishing needs before deciding.