Kerf is used to mean the thickness of the cut itself when using a cutting tool. Be careful in general using Z moves, as this does have the potential to physically damage your laser. If your system uses auto-focus, you may not be able to push the focus point lower, because most systems treat the auto-focus height as the lowest possible height (Z limit) to avoid crashing the laser head. This is most often used for thick cutting or deep engraving, allowing you to shift the focus point deeper with each pass to help maintain efficient cutting. When doing more than a single pass over a shape, the Z step per pass setting allows you to tell LightBurn to raise or lower the laser with each pass by some amount.
Focusing deeper into the material can sometimes help to cut thicker material, and lifting the laser away from the material can produce a thicker line. If you have Z moves enabled, and your controller supports it, the Z Offset setting can be used to move the laser head closer to the material (inward) or farther away from it (outward). Sometimes, when cutting thick material, trying to engrave very deep, or using a lower power laser, more than one pass may be necessary. How many times the laser will repeat the shapes on this layer. (In older versions of LightBurn this was displayed as 'Cut', but the term was changed to make it easier for new users, and the functionality is identical). The only difference between surface marking and cutting is the power and speed. If you move slowly and with high power, especially with a CO2 laser, you will cut deeper, possibly through the material. If you move quickly, or with low power, you will likely just etch the surface (sometimes called vector marking). In this mode, the laser follows the exact path of your design, tracing the lines with the beam enabled at the power you've chosen. The image above shows the settings for 'Line' mode. Numeric Edits - size, position, orientation
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