This is a CNC machine made out of left over parts from my schools robot build. The only thing we paid for was the circuit board to run it. Grand total of about $70. This was made with no directions, all of it was trial and error. This should get you started if you want to build one.
1. I started with an aluminum base (19.25 wide, 13.5 deep and .25 thick)
2. On to that is mounted the two uprights (10.25").
3. And in between is the cross brace (16.25")
4. Also mounted to the base is two pieces of 1.5" aluminum angle which two 24" full extension drawer slide are mounted to for the Y Axis.
5. We used Accuglide rails and slides for the X and Z Axis.
6. For the X the slide rails are mounted to a piece of aluminum (3 x 19.25 x .5)
7. The X axis gets mounted to the two uprights. It is adjustable the way we did it, so we can adjust for our dremel travel.
8. Next I made the Z axis slide. Its another piece of Aluminum with the slide rails mounted to it.
9. We made some 1" x 1" x .5" aluminum blocks for spacers for the Z axis.
10. Those are put on and it gets mounted to the slides on the X axis.