[batchelc] decided to make his own large-scale CNC Foam Cutter and took a lot of photos along the way. Since machine is 4 axis, meaning both sides can move forward/back and up/down independently ...

Figure 2-6: Simulation of a dual rotary mechanism fastened to the table of a standard 3-axis CNC milling machine. Tool length offsets work the same way here as with any conventional 3-axis machine.