Engraving beam offset

So… in cnc milling, the software uses the radius of the bit as an offset so that what is left is the intended design.

2 questions.

  1. Is there something like that in lightburn? An option to input your beam diameter.

  2. If not, is that something you can add eventually? That really would help.

For lasers, that’s called “kerf offset”.
In general the beam diameter is very small - 0.05 to 0.3mm, depending on your laser type and lens setup.
So in most cases people don’t overly worry about it unless trying to do something like cut pieces from two different materials that then need to be inlaid into each other with a very tight fit.
To adjust for the beam width (kerf) in that case, you can use the “kerf offset” cut option:

More details here: Line Settings - LightBurn Software Documentation

Not exactly what I’m talking about. Kerf offset is only available for line. Not fill.

Every engraving I do, I have to offset the text thicker or thinner depending on negative engraving or not. It would be nice to not have to do that.

Nope. That is resolution. It does nothing to offset the engraving beam away from the geometry.

Here is a rough illustration
Black square = geometry
Red circle = laser beam
Blue line = laser path

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Not quite - it still doesn’t in-set the area to fill by the kerf amount, which is what he wants. It would be relatively easy to have fills respect kerf. They don’t work that way at the moment, but I’d really just need to add it to the UI and make sure it’s handled properly in the cut builder.


I look forward to it.

I also have made a discovery on my settings that affected it. It was only ever on metal coated engravings that I was having issues. I doubled my speed, drastically lowered my power, but increased my lines per inch to 1000. Huge difference in what it removes.

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