Make your own PCB Mechanical Routing/Erosion/Milling Machine at a low cost.
PCB Mill – Jonathan Ward – MIT
“Design a low cost circuit board milling machine optimized to be mass-produced.”
The overall device has a working area of 4″ x 6″ with a footprint roughly the size of a letter-sized sheet of paper. Capstan drives were chosen for their simplicity and low cost, and also serve as torque limiters to prevent excessive loads on the small-diameter drive cables.