Stainless steel is a very hard material, which makes one wonder if engraving on it is possible, and if it is, they question its quality. Laser beams are powerful enough to engrave on this material, and if done correctly, will result in a permanent, beautifully etched design.

I will share a detailed step-by-step guide on how to engrave on a stainless-steel cup using a laser engraving machine, what to look out for, solutions to common issues throughout the process, and the equipment you need.

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These extension legs are meant to raise the laser engraver’s height to accommodate the tall items that will be mounted on the rotary attachment, so they don’t touch the floor when engraving.

Lay out all the parts and arrange them to fit together. Use the internal connectors to join the rails and connect the corner brackets. Lastly, tighten any bolts and screws and fix any rubber feet so that the legs are sturdy.

Slightly lift the engraver frame and align the legs into the pre-cut holes. Then use the provided screws and bolts to secure them to the frame. The engraver should be levelled and stable using the extension legs.

If you move the laser gantry to its lowest position, you should still have enough room underneath it to accommodate the cup’s widest diameter.

Connect the laser’s power adapter to an AC power outlet and press the “power on” button. Loosen the emergency button, if engaged, to power the machine, and then unlock the safety lock. 

Don’t worry if the head isn’t in its home position, you can always do it manually or prompt it on the laser software later, after connecting it.

The rotary attachment is a replacement for the engraver’s Y axis, so it is controlled by the rollers during engraving.

Clear the laser bed and position the rotary attachment parallel to the X axis. There should be enough room on both the top and bottom ends for the cup to rotate freely without hitting anything. Ensure it is sitting flat, levelled and sturdy.

In most machines, this port is near the back rail, and is labelled “Y-axis”. Carefully unplug this cord.

Plug the rotary’s power cable to the port where you previously unplugged. Ensure the connection is steady and firm, and that the wires don’t tangle.

Now that you have set up all the hardware, it is possible to link it to the software for designing and controlling the process. Turn on your computer and launch the software. You should have downloaded all the needed drivers for the engraving machine’s software beforehand.

Most engraving machines use USB or WIFI to connect to the software. Others use Bluetooth and the Cloud. First-time users have to set up the machine profile. Click the “Find My Devices” button or manually add the engraver by naming its brand or the IP address, usually found on the engraver’s screen.

The software should be able to detect the machine and connect. If not, check the USB cable connection, or restart both the engraver and the computer or software.

You now need to configure some settings on the software that instruct the laser on how fast to rotate, and how far the rotation should be so it can properly map the design on the cup. 

In most machines, you have to manually enable the rotary mode. Enter the cup’s dimensions accurately to avoid stretched or compressed images. This means you have to measure the diameter and the length of the area to be engraved. If the software prompts for the circumference instead, you have to multiply the diameter by 3.1416.

Next, enter the steps per rotation. Some engravers automatically assign this number based on the drivers and rollers.

Then, configure the speed and power. This might differ based on the laser engraver’s model, the needed depth, and whether the cup’s surface is treated or not.

Here are some recommended settings for different stainless steel cup surfaces.

Place the cup along the rollers. Check to see if the cup rotates freely without touching the surface. The top and bottom rims should make contact with the rollers for smooth rotation and to avoid wobbling. Some rotaries come with a fixture to secure the cup’s edges.

Rotate the cup so that the area to be engraved is facing up.

This determines the precise distance between the laser length and the cup’s surface where the laser beam is the sharpest, and that will produce the most detailed engraving. Always ensure the lens is clean and clear before you start focusing the laser.

Some models auto-focus the laser head. In this case, you have to input the cup’s thickness, or press “Autofocus” on the software.

Open a blank canvas on your laser software and size it to match the area to be engraved. Then open a design from your computer folders, either by dragging and dropping, importing, or using the copy and paste function. Most machines accept raster images and vector formats. You will need to use a Grayscale engraving mode for images in JPG or PNG formats.

Resize and center the image in the canvas, positioning it as you would like it to be engraved. If the image has multiple layers, ensure each layer is assigned to engrave, not to cut.

The frame test will give you a visual of where the engraving will happen by moving the laser head along the design’s outer boundaries. No laser is fired, so this is not the actual engraving process.

Unlike when performing a frame test for flat surfaces, you will need to activate the rotary mode. Afterwards, press “Frame”. Observe that the laser head moves within the intended area, along the boundaries.

Click the “Start” button on the engraving machine. The rotary attachment starts spinning the cup, and the laser head starts firing a laser beam, engraving the design on the cup.

Watch the process to check for any fires, excessive smoke or cup shifting, and immediately press the emergency button to stop the process in case it happens. After it is done, the laser head moves back to the start position, and the attachment stops rotating.

After engraving, allow a few minutes for the cup to cool down before taking it out of the engraver. And before you put it away, clean the surface using rubbing alcohol and a microfiber cloth to remove any residue and burn marks.

Then, to give your cup a proper finish and make the engraving more durable and visually appealing, apply a thin layer of sealant spray or stainless steel polish.