I started looking at building a home CNC for simple PCB drilling by salvaging parts from old equipment. In the process have discovered that I could potentially do many more useful things like cutouts in plastic cases, light aluminium work etc if I built a semi decent one. Prices for parts from online shops seem quite reasonable, but what sort of accuracy can I expect? One site I've seen uses a fairly expensive CNC to mill PCBs, like the one below.
(Sorry for image size)
This sort of accuracy is pretty astounding, would a decent DIY CNC be able to do the same? Being able to mill SMD pads like that would be very neat, but if that's too small then I'd probably just build an automatic PCB drill instead. A 60 degree cutter is apparently used to do the above. I don't need a huge model, a table top 30cm square working area would probably be fine.
Any thoughts from people who have built machines previously? I've seen other threads about PCB milling, but don't know whether people regularly mill SMD pads.