Kerf & Fit Test

How to use it

1. 1. Pick laser or CNC, and type your material and its measured thickness.
2. 2. Download the test file and cut it from the same sheet you will use.
3. 3. Push the squares together, measure the total, and type it in. The kerf is worked out for you.
4. 4. Try the tab in each slot and pick the fit you like: tight, snug or loose.
5. 5. Save it. Box Maker and Hinge Maker use it next time you open them.

What you can make

• • Finger-joint boxes that fit first time
• • Press-fit stands and puzzles
• • Living hinges that bend without cracking
• • A saved library for each material you use

Make it your own

Download for LightBurn with the labels and the cut already on separate layers, ready for your own power and speed. The SVG and DXF open in Illustrator, Inkscape, xTool Creative Space and Glowforge (and CAD for the DXF) for any further fine-tuning.

Open Customise more for every setting, and Copy link to save or share it.

Questions

What is kerf?

The width of material the laser burns away as it cuts. Parts come out slightly smaller than drawn, so joints need to allow for it.

Why measure it?

Kerf changes with your laser, lens, focus, power and material. A 10-minute test beats guessing and wasting a whole sheet.

Does it work for a CNC?

Yes. Choose CNC and it finds the fit for your bit and material.

Where is my result saved?

In this browser on this device only, not on this site.

Is it free?

Yes, with no sign-up.

If you need a more customisable option or something unique, let me know and I'll add it, usually within days.

Try next: Box Maker, Hinge Maker, Plate & Bowl Stand Maker.