The world of DIY enthusiasts is constantly evolving, with a plethora of CNC machines available for hobbyists and professionals alike. However, some creators prefer to forge their own path, just like Chris Borges, who has recently showcased his impressive and unique creation: a rock-solid, concrete-filled CNC milling machine.

This innovative machine features a robust body made of concrete, which is encased in a meticulously designed 3D printed shell. Not only does this shell serve as an aesthetically pleasing outer layer, but it also functions as a practical mold for the concrete. Within this dense concrete structure lies a sturdy steel skeleton; the rebar components consist of threaded rods and a length of square tubing designed to support the main column, ensuring exceptional stability and durability. For those interested in the construction process, a detailed image captures the moment the concrete is poured around the rebar, and an engaging build video is embedded below for a more comprehensive overview of the project.

In terms of functionality, the machine features all three axes that glide smoothly on linear rails, which are crucial for precision movements. These axes are connected to lead screws powered by the commonly used NEMA 17 stepper motors, known for their reliability and efficiency in CNC applications. The air-cooled spindle, while noted as a potential weak point in the design, is cleverly mounted to a pivoting counterweight. This design choice allows the spindle to operate on rails, enhancing its stability during milling operations. Overall, the CNC milling machine exemplifies a well-thought-out and robust design, capable of cutting through aluminum with ease, as demonstrated in Chriss testing.

Remarkably, Chris Borges had reportedly never operated a traditional milling machine prior to this project, making the quality of his design even more impressive. His thorough documentation, which includes a comprehensive Bill of Materials and an extensive 45-page assembly guide, provides anyone interested in building their own version with an invaluable resource. This attention to detail and commitment to sharing knowledge reflects the spirit of the DIY community.

This is not the first concrete-filled machine project that Chris has presented; dedicated followers may recall his previous work on a lathe, which also showcased his creativity and engineering skills. Moreover, while CNC mills are a common subject within the DIY arena, Chris's unique approach ensures that his contributions stand out as particularly innovative.