A few nice aluminium cnc machining images I found:
CNC y axis parts
Image by jiskar
These are the parts we machined for the y axis stepper motor mount. It’s a base block that holds two axial bearings and the lovejoy coupling, and two mounting plates. The parts are made of aluminum.
Pointless Lego contraption on aluminium rails
Image by DanR
I bought a couple of Inanimate Reason’s machined-aluminium Lego-compatible parts. Then I stuck a bunch of gears on ’em to make the photo more interesting.