How to Use a Fiber Laser Marking Machine: S4 Setup and First Marking Guide

A fiber laser marking machine can produce permanent text, serial numbers, logos and graphics on suitable materials. Correct assembly, focusing, file preparation and parameter testing all affect mark quality and operator safety.

This guide uses the S4 20W fiber laser marking machine as a practical example. According to its operating manual, the S4 uses a 1064 nm laser source, built-in fan cooling and interchangeable marking fields. The instructions below are intended to help a new operator understand the normal workflow. They do not replace the machine manual, local safety requirements or application testing on the actual workpiece.

1. Complete the Safety Checks Before Power-On

Place the machine in a dry, ventilated area away from vibration, strong electrical interference and combustible materials. The machine and connected equipment must be properly grounded. Provide suitable fume extraction because laser processing can release smoke or hazardous emissions depending on the material and coating.

The S4 manual identifies the equipment as using a Class 4 laser source. Direct or reflected radiation can cause serious injury. Do not place mirrors, loose reflective objects or unrelated items in the working area. Never leave the operating machine unattended, and keep appropriate fire-control equipment nearby.

Before switching on the machine, inspect the power cable, USB cable, emergency-stop button, scan head, field lens and lifting structure. Confirm that the workpiece is suitable for laser processing. Unknown plastics, PVC-containing materials and coated products should not be processed until their composition and emissions have been checked.

For commercial production, an enclosed and interlocked workstation is preferable to an open marking arrangement. The final safety classification depends on the complete installed system, not only on the laser source.

2. Assemble, Connect and Focus the S4

Install the lifting shaft on the working platform, then secure the optical assembly to the right-angle mounting plate. Check that all fasteners are tight and that the scan head cannot move unexpectedly. Connect the machine to the computer with the supplied data cable and connect the correct power supply only after assembly is complete.

Place a flat test piece on the worktable. The S4 uses a hand-crank focusing lever and a three-red-light focusing method. Raise or lower the head until the three red guide lights converge at one point on the material surface. The focal position can vary slightly between lenses and machines, so use the supplied focus reference and confirm the result on a test sample.

The workpiece surface should be level and parallel to the marking head. If one side is higher, part of the design may sit outside the effective focal plane, producing a weak or uneven mark. For unusually tall parts, the S4 head can be rotated after loosening the specified fixing screw, but the head must be secured again before operation.

3. Prepare the File and Start with Test Parameters

Install the supplied driver and BSL marking software according to the manual. In the software, an operator can create basic shapes and text or import compatible vector artwork. Text and vector graphics normally require a fill pattern before marking. The fill-line spacing controls density: a larger spacing generally marks faster and lighter, while a smaller spacing generally marks slower and darker.

Do not treat a parameter table as a guaranteed recipe. Laser response changes with alloy, coating, surface finish, lens, design size and desired contrast or depth. Begin with a scrap piece of the same material and make a small parameter matrix. Change one factor at a time—typically speed, power, frequency or line spacing—and label every test area.

Correct focus and a controlled test matrix help establish a repeatable marking window before production begins.

The S4 manual provides reference settings for several materials. These values are starting points only. Some plastics may generate unsafe fumes, so confirm compatibility first and use extraction during testing.

For bitmap images, resolution, grayscale processing and dotting time also influence the result. Use a clean, high-contrast source image. Excessive resolution can increase cycle time without improving the finished mark, especially when the material cannot reproduce very small details.

4. Preview the Position, Test and Begin Marking

Use the red-light preview before every new job. The preview should show the approximate marking boundary without activating the processing laser. Confirm that the design fits completely inside the workpiece and does not cross a fixture edge, hole or curved area.

Start with one test mark. Observe the process from the approved operating position and be ready to stop the cycle if the part moves, smoke extraction fails or an abnormal condition occurs. After marking, inspect contrast, edge definition, position and surface damage. For production codes, scan or verify the code using the acceptance method required by the customer.

Once the result is approved, save the file and record the machine, lens, material, focus reference and parameter set. A documented recipe reduces setup errors when the job is repeated. Fixtures or locators should be used for batch marking so that every part returns to the same position.

The optional rotary device requires a separate setup. Enter the actual workpiece diameter, configure the rotary axis and perform a rotation test before marking. Cylindrical text and split vector designs may require different software functions, so operators should follow the rotary-device manual rather than applying flat-part settings directly.

5. Troubleshoot Common First-Use Problems

If the machine does not power on, check the socket, power cable, main switch and emergency-stop state. If the computer cannot connect, inspect both ends of the USB cable and confirm that the driver is installed correctly. A different computer USB port may solve a connection problem.

A mark that is too light—or does not appear—often points to incorrect focus, excessive speed, insufficient effective power, unsuitable material or an unclear source image. Recheck focus before increasing energy. If only part of the design is weak, confirm that the workpiece is flat and that the head is perpendicular to the marking surface.

If a mark is too dark, rough or deep, reduce the applied energy by increasing speed, reducing power, increasing line spacing or reducing repeat passes. Make small controlled changes and compare samples. When a fault persists, stop using the machine and contact technical support rather than opening the laser or electrical enclosure.

FAQ

How do I know when the S4 laser is correctly focused?

Adjust the hand crank until the three red guide lights converge at one point on the workpiece. Confirm the focal position with a test mark because lenses and individual machines can vary slightly.

What laser marking parameters should a beginner use?

Use the manual's material table only as an initial reference. Create a test matrix on scrap material and change one parameter at a time until the required contrast, depth and cycle time are achieved.

Why is my fiber laser mark too light or incomplete?

Common causes include incorrect focus, excessive speed, insufficient effective energy, an uneven workpiece, unsuitable material or poor source artwork. Check focus and placement before making large parameter changes.

Learn More

Explore ForwayLaser's laser marking machines and fiber laser marking solutions, or contact our team to discuss sample testing and machine configuration.