Designspark user stuartChilds has a multi-part blog entry documenting the conversion of a Denford Novamill with a non-working controller to using a BeagleBone Black running Machinekit with a
Probotix cape and Gecko stepper drivers.
Part 1 covers the mechanical and wiring changes, while
part 2 details software integration and configuration. Upcoming posts will cover the spindle drive, CAD/CAM, and "making chips".