Oh... where to start...
One, and probably the major, reason why I started building this machine is that I wanted to make PCBs. Just one-offs that could be made in hour(s) instead of having to wait weeks for the boards to be delivered. Obviously I could also etch the boards and while @CNLohr makes it look so easy, to me the process is just not appealing mainly because waste disposal is a whole nother issue. So PCB mill it is (or was). Plus, it might come in handy for milling other things as well and maybe I can 'slap' an extruder on there, too, but that's probably another 2.5 years down the line ;)
Contents:
- Some links - more information and inspirations
- Electronics
- Electronics - motor control
- Mechanical 'design'* - general overview
- 'Spindle'
If I may comment your design looks good, but I don´t see alumin(i)um holding up to the hard steel bearings long before your machine starts developing slack. I'm no mechanical engineer , just a guy with an angle grinder but IMHO i'd make the slide rails out of steel (readily available) or incorporate some method for adjusting the bearing as the rail wear out.
I've got to start searching around here for some of those V bearings tough, they look promising as linear sliders and i'v always wanted to build somesuch devices.
cheers