This instructable shows how to shape polystyrene foam, using a CNC machine. Starting with a brief introduction, design software necessary for creating an STL file is discussed. This is followed by a method for creating G-code, using an STL file as input. After this comes the introduction to GRBL, an arduino based system for using G-code to control stepper motors of a CNC mill. Stepper drivers are mentioned, after which the creation of large CNC hardware is described. The instructable finishes with next steps.
PS. I plan to expand/update this instructable as I gain experience and make improvements to my machine. Come back to check if you are interested! Also, if you would like more clarity on any of the steps, leave a comment and I will try to help out. I could potentially add more pictures as I took photos/videos of pretty much everything I did.