The device is a rudimental CNC milling machine which can drill holes from a predefined pixel matrix into variable materials. The whole machine is transportable and powered by battery packs which can run up to 3 hours. It weights about 2,5kg and can be transported on the users back. The frame of the Petroglyphomat consists of stainless steel, whereas the rest is constructed from laser cut plastic. When a location has been selected, there are two ways the Petroglyphomat can be mounted on to a surface: It can be tied to a free-standing object with the two integrated belts, or it can be anchored into a flat surface with pre-drilled holes by using the four corner screws. For controlling the Petroglyphomat the user interacts with the built-in computer via a mouse using a combination of Processing and Arduino. From the interface on the screen one can choose any pixel-based black and white image with up to a resolution of 64×64 pixel to be engraved on the material. The image is then forwarded to Arduino and a motorshield, where it is translated into control commands for the movement of the three motors. Every hole is the representation of a black pixel from the source image. For the actual engraving the drilling unit goes step by step and line by line through the precalculated matrix and drills the holes accordingly.