When laser engraving machines carve curved surfaces, they usually use auxiliary systems, such as rotation aids, to carve cylinders such as bamboo tubes, wine bottles, bird cages, etc. In addition, there is another type of surface that is irregular and uneven, and you can choose a laser head that can automatically adjust the focal length to work. Now laser engraving machine manufacturers are able to produce laser heads for automatic focusing on metal and non-metallic materials. This makes surface carving possible.