This is a Bob Campbell design. I started out to build a 24 x 24 inch router. When I finished I ended up with an x of 28.5 and y of 26. The Z axis has 8 inches of travel but only 5 in of clearance between table and support plate. I could redrill that plate and gain over 2 more inches, but will save that until it is necessary. The motors are 400 oz. driven by 201 Geckodrives. At present I have a mounting plate for a Dremel tool and a Ryobi trim router. Am usnig DeskCNC software from IMService. My cad program is IntelliCad 6 Pro from Autodsys.
In 2013 I added a Taig motor and spindle whitch utilizes ER-16 collets.Max rpm's almost 10,000, runs much quiter than a trim router and a lot more sturdy than Dremel style tools.
I have had several request on where to find the aluinumn extrusions. So here are links to some suppliers.