Raster engraving is the standard process for engraving. This process is known from inkjet printers, where a file is printed line by line.
How does this work with a laser?
The file to be printed is a bitmap, i.e. made up of pixels. The image to be engraved, represented as a plane, is engraved by the laser machine line by line, point by point. The process is similar to a regular printer, but instead of ink being applied, during raster engraving material is removed layer by layer. This is done bidirectionally, i.e. engraving is done in alternating fashion in both directions.
Due to the line-by-line processing in raster engraving, in this process the speeds of the two axles are very different: High on the x axle, i.e. the axle to which the laser head is attached, and lower by comparison on the y axle.
In raster engraving, the PPI parameter (PPI = pulses per inch) to be selected in the Trotec JobControl® laser software is important, because it controls the density of the laser points. Read more about the parameter definition.