I'm working on designing and building my first CNC router. As I am not a mechanical engineer nor have I much experience with building (apart from K'nex and Legos from my childhood), I have virtually no clue what I'm doing. That said, I do know how to use a CAD program, so I've been working over the past two weeks to make what I think will be a working design. Now that I have completed a first draft of my CAD model, I have a number of questions: I plan on using 3/16" thick 3003 grade aluminum for my gantry supports since that was a cheap affordable option from my local supplier. I've never worked with 3003 aluminum before. Do you know if it will hold up to the strain of a CNC? My machine uses 3 Nema 23 stepper motors (2 for the Y-axis and 1 for the X-axis along the gantry). Would this be considered overkill for my system, and could I get away with a Nema 17? The X and Y motors are each turning a 500mm lead screw. Since I don't have a CNC to help make my gantry supports, I plan on borrowing a drill press to make all the holes and couterbores. Since my X-axis uses a lead screw that must be kept straight and I'm essentially making the supports by hand, how can I keep my tolerances as narrow as possible while drilling? Furthermore (from question 3), what would be considered acceptable tolerances for such a design? Lastly, do you have any suggestions on how I could improve my current design? Here's my progress so far: TRIMETRIC VIEW Trimetric View by Jason Kraft posted Jan 15, 2016 at 1:37 AM FRONT VIEW Front View by Jason Kraft posted Jan 15, 2016 at 1:36 AM RIGHT VIEW Right View by Jason Kraft posted Jan 15, 2016 at 1:37 AM TOP VIEW Top View by Jason Kraft posted Jan 15, 2016 at 1:37 AM I know that was a lot of questions thrown at you, so if you'd prefer, I could separate these questions into individual posts (I'm not sure what is considered the proper etiquette on this forum).