I inherited the X-Y axis from an old scientific machine and built the Z axis which together with a small Bosh router, domestic vacuum cleaner and an old xP PC formed the basis for a CNC Router. The electronics were easily sourced on-line and so was the MACH3 software which is a free download for testing (full licence was purchased for $75). I was astounded at how much information there is on the Net and how many users there are who freely share their experiences and products on the subject. I enjoyed the project hugely and learned much about the technology. The resolution of the software is capable of a tenth of a micron, I was able to achieve accuracies of about 50 micron with my hardware setup. Currently attempting conversion of CAD drawings to Gcode using MasterCam for the conversion.