Skip to content
UV Laser Guide

Troubleshooting

How to Calibrate the xTool F2 Ultra UV

A practical calibration for the F2 Ultra UV: focus first, then a full-scale grid for power, speed, and frequency. Do not mix rows from different makers.

1 min read

On this page
  1. Frame before you engrave
  2. Focus the scrap
  3. Engrave one grid, full size
  4. Judge under one light
  5. FAQ

Calibration here means two different jobs that people mash together. One is making the camera and the beam agree on where the square is. The other is finding the power, speed, and frequency your blank actually likes. Do them in that order.

xTool defines the process dials for the F2 Ultra UV as power (1–100%), speed, passes, lines per centimetre, and frequency from 40–150 kHz (xTool Support). The support page does not publish a slate number. Community logs do. Use the logs as the first row of a grid, which is what the slate settings chart is for.

  1. Frame before you engrave

    The F2 Ultra UV's camera workflow is there so you can see the frame. If the frame is wrong, fix alignment before you blame the preset. A jig with a known origin makes this faster for batches: self-centering jigs.

  2. Focus the scrap

    Steps for the measurement itself are in How to Focus a UV Laser Correctly.

  3. Engrave one grid, full size

    Atomm publishes a slate calibration grid made on the F2 Ultra UV. Do not scale it to "fit the scrap." Scaling changes energy density, so the square you pick will not match the file you run later.

    For a cold start on slate, include 100% at 150 mm/s and a 40 kHz square, because those are the published anchors. Then add neighbors. Do not borrow speed from one blog and power from another.

  4. Judge under one light

    Name the preset with the supplier and the thickness. "Slate" is not a preset. "River slate 4.5 mm, white" is.

FAQ

How often do I recalibrate?

When the material, supplier, thickness, or lens changes. A new box of coasters counts.

Is camera alignment the same as material calibration?

No. The camera tells you where the job will land. The grid tells you how the material will look.

Keep reading