EVOCNC v1

thingiverse

This project is in progress and will continue to evolve for a while, so if you print this out, keep in mind that changes are on the horizon. I've been working on my CNC design for quite some time now. I was inspired by the MPCNC when I stumbled upon it, and I liked how they used electrical conduit for their guide rails. However, I wanted something a bit more straightforward in design, and I wanted to incorporate lead screws into the mix. As it stands right now, this project is on a 2x2 foot board, but I plan on scaling up in the near future. You can keep tabs on the progress of the build over here, my website, or even check out my YouTube channel for updates. My website is still under construction, so bear with me there as well. This machine relies on 3/4 inch electrical conduit, 5/16 all-thread rods, NEMA 17 steppers, Ramps 1.4 boards, Arduino Mega controllers, and Marlin firmware. I initially wanted to be able to switch between a Dremel, router, 3D printer head, or laser module, but after initial testing with the Dremel, I decided to just go ahead and buy a small 300W spindle - and boy am I glad I did! It's incredibly quiet. The next step in this project involves building a cabinet around six inches deep onto the bottom of the CNC. This will house all the electronics and feature a faceplate with the display, speed dial, and other switches. The machine is already quite portable, and this will help make it even more so. UPDATE*** 11/18/18 I've made some changes to the Y axis tube bases design since my last update. I've shortened the gap between the all-thread rod and the tubing, which I didn't like having a large gap and a long linkage arm. I've also added the linkage that connects the Y axis carrier and the nut for the all-thread rod. As of now, these two parts are being epoxied together. In the past, I used super glue to hold them together, but I'd like to be able to print the linkage and the carrier as one piece in the future - although it would require too much support material and take too long to print. If requested, I'll create an additional file with the Y carrier and linkage as one piece, so you can choose whether or not to print them that way. The new Y axis bases are shorter and stiffer, but I didn't add anything back to the bottom of the bases, which means the overall height is lower. We can print some spacers (I haven't designed these yet) or use squares of MDF/plywood under the bases to gain height - let me know what you all think on that. There's also a bit of downwards pressure being applied to the Y axis all-thread rod with the new Y linkage, so I've removed 0.5mm from the design to help alleviate this issue. However, I'm not sure yet if it's enough to cause any problems - but turning the Y axis all-thread rod by hand doesn't show any binding. There is a bit of binding in that linkage with the two nuts being used as opposed to when I only had one nut, which might be due to a little bend in the threaded rod. So for now, I'm just using one nut on each side until I figure out what's causing this issue. The M3 nuts used in the Y linkage have to be pressed in with pliers - I'm using channel locks to do it. I'm working hard to get this project completed, and my next task is to redesign the Z axis plate. It won't affect the X axis carriage or the hardware being used, but I'm hoping to come up with something that will bolt in place of the piece of wood and replace the need for the smooth rod mounts and the separate mount for the Z motor. http://coffeestaintech.com/evocnc/ https://youtu.be/bEGZuje0GBI