Materials of most different shapes (no matter if round or flat) can be marked with a special needle. A distinction must be made between the following marking methods: Needle embossing and needle scribing.
In needle embossing (also called impact point method), the material is marked with a hard metal tip (needle) oscillating by compressed air, which is moved in X and Y direction during its up and down movements.
This causes a dense sequence of individual points (lettering) to be pushed into the material. The carbide tip hits the workpiece shortly before its lower reversal point. This compresses or displaces material in the workpiece, creating a point on the workpiece. During needle embossing, the marking consists of a dense sequence of individual points that form a closed line. Alternatively, if desired, a font can be selected in which the dots are embossed so far apart that a dotted font is created instead of a closed line.