Instructables

Easy to Build Desk Top 3 Axis CNC Milling Machine

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Picture of Easy to Build Desk Top 3 Axis CNC Milling Machine
Here is a way to make a computer controlled milling machine. That puts the real power of a computer control machining into the hands of the average human. Small enough to set on the desk but scalable to any size. As inexpensive as possible without sacraficing accuracy (too much). All most all the parts can be purchased in local retail stores. And above all CHEAP you can be up and running for well under $200. With it you can do 2 Dimentional engraving and PC board etching and 3D milling and modeling in Foam, Wood, Plastic and other soft materials.
Also try watching the YouTube movie at the end (the last frame).

New information on the Motor Driver Circuit is (HERE).

 
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Step 1: The Frame

Picture of The Frame
The frame needs to be a flat base that you can mount everything on horizontally and a goose neck of some kind to hold the Z axis (the up and down part with the motor tool)firmly in place. I used one inch pipe just for fun but as it turned out it was pretty handy too. When I needed to make adjustments I could just tap it with a hammer. As you can see the post that holds the Z axis doesn't have to be in the center. It just needs to be firm and the water pipe does a good job of that. Later, after you are sure all the pipe joints are in the right place, you can add a drop of thread sealer to the joints and it will be a good solid structure.
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carabac4 years ago
 This is my version of Tom's CNC. It uses the stepper motor 3 Axis CNC Driver Kit from chromationsystems.com (Jeff from Chromation Systems was a ton of help and his instructable is here: http://www.instructables.com/id/Parallel-Port-3-Axis-CNC-Driver-Opto-Isolated/) and I am using KCAM for the software. I named my machine CNCme. You can also watch the Youtube at: http://www.youtube.com/watch?v=Uzli11WJeo4.  Thanks Tom, Jeff and Instructables. 

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sharbin carabac4 years ago
Nice Carabac!  Where did you get the slides that you used?
carabac sharbin4 years ago
The slides are off a network hardware cabinet.  I purchased them from a local surplus store.  They are very nice because they run on ball bearings.
daney1984 years ago
 Hello

I make this CNC Milling Machine

Thanks Tom & Instructables
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Wow! Great work!

Does that panel behind the machine related to it or is it something else?
Thanks 

yes panel is related to machine. all the kit and wiring inside of panel.
That looks like an excellent version of this instructable!  Is there a possibility of you doing an instructable of your panel?  Looks great!
narpas5 years ago
Here is my mill I guess its not cnc and does not follow many of your design concepts but you inspired it!
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that's rad. it's like an etch-a-sketch mill!
sefi6 years ago
hi tom, i too was inspired by your simple design, and actually guided a high school project based on your designe, the hope was that it will enable students to make low cost pcb in school. after the project(wich was a bit diffrent from yours and didnt works all that well duo to my lack of technical skills and experience(im 18) and other things) ended i decided to make a V2 wich is almost the same as yours, and it dose work well,i manged to see it do very presice things with a pencil. the problem is i cant find a right drill for making the pcb's,(im pretty sure thats it) i got this 8 pcs kit from drill bit city but the drill that dose the routing dose not have a pointed tip in the very end and there for dosn't penetrate the circuit until much pressure is applied but then it goes in way to deep, im guessing its the drill bit but id like to hear what you say, and maybe recommend me a drill or a set from drill bit city or anywhere else(take in account i live in Israel ) my main goal is PCB's although i already did some name engraving and it came out very well! 1 more thing... is there a way to use lazycam with kcam? and what do u think about mach3 it look way more complicated is it any better?
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Wow! I like the design of the machine in the last three pictures... Do you have any kind of build log for it? More pictures? What did you make the frame out of? Thanks, snow
hi, yes sure there are plenty more pictures at my website (sefi.tk) the frame is made from U channels alone, it was a much much more stable design yet it requires precision with assembly cutting and the whole process, out of my experience, after building 3 models, its clear to me that the cost of a stable machine is it requires more precision in ever step of the way, if you have experience, tools, and two right hands then go for something stable, otherwise stick with the basic plans. btw i solved the whole pcb making thing by getting an endmill and made already a bunch of pcb's and many other thing, thanks alot tom. hopfully my next project will be my own instruct-able :P
codex sefi6 years ago
Regular Dremel engraving cutter (#105) works fine for me. It's 0.8mm wide and I use it for PCB Isolation Routing. You can find it in any hardware store (Ace\Home-Center\Rosenfeld) here in Israel.
sefi codex6 years ago
i tryed ace/homecenter with no luck, in tel aviv & hertzliya where exacly did you get it? by the way lior, i sew you website - VERY NICE :) i want to talk with you if i could il email you from your forum.
Tom McGuire (author)  sefi6 years ago
Congratulations. That's a good piece of work for a class project. I can give you some tips on PCB work. The motor tool can have a problem with wobbling, that is the bit may be off center. It may have an aluminum collet that is just not very good. I was suprised to find the 3 jaw chuck replacement worked better. May be because it has more mass. Also I found bits at this site:
http://www.precisebits.com/products/carbidebits/scoreengrave.asp
Good job.
I hope this works for you.
Tom
crreed6 years ago
Hey Tom, great project! I had a lot of fun building this and as soon as I can scavange a DB25 cable, i will be able to use it. Here are some of my pictures. The table is 9"x11". I added a simple fish tank pump to blow off the dust. The plexiglass extenders allow the router to utilize the full 9" x11". I will be posting pictures of my slightly modified circuit board.
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Considering you've finished yours, do you think that a machine with 10" x travel would have to have 20" x rails, or is my logic screwed up? Thanks, snow
Tightwad crreed5 years ago
Wouldn't the extenders flex and cause the table to move? Either up/down flex due to the weight of the Stepper, or torsional flex as the motor moves the table?
crreed Tightwad5 years ago
the weight of the table itself, the anchoring provided by the x axis motor provide stability and prevent wobbling of it.
altomic crreed6 years ago
fish tank pump- sweet.
Roidy6 years ago
Hi Tom your design is fantastic and so easy to make this is now the second one I`ve made, I work in a uPVC window factory and so I made mine out of welded uPVC window frame. I got my stepper motors out of an old fruit machine of all places! Still needs a bit of tweaking but I`ve routed a few PCB`s and everything works great. Rob
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fjr1226 years ago
Last night I completed my construction :D Tom, Thanks so much for helping me get here! Here's some pics (yeah I've still gotta hook everything together)
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userhck7 years ago
This is my first full-on, serious project I have done from this site. Well, maybe I shouldn't say that, as i am not quite done. Went shopping for most of the supllies this morning, which took me from Home Depot to Ace Hardware to Big Joe's. The only things I need now are the plexi planes and the motors, which are coming. An interesting day to say the least. Also, I don't suggest getting the pipe at Home Depot, as they semm to be downgrading their one-inch pipe supply. Weird. Here are the pics so far, how does it look? You can see the threaded rods in the back.
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fredan userhck7 years ago
I have also started one of these projects and have completed two stages. I also made some changes to the design perhaps you may find them helpful. The upper image is the current state of the project. If you look on the upper rail, I have added limit switches to prevent over travel. I found the switches in various microwaves which I salvaged for parts. The second image shows the roller tensioner. I uses two roller blade bearings and some picture hangers with springs, purchased at the local hardware store. Added a couple bends to the hangers, so the screw head would not rub on any surfaces, then located a pivot point which would allow the rollers to contact the guide and allow the sprint to tension. see third image. The last image shows how I added connected the threaded rod to the bracket. I found these screws used to go into the bottom of wood legs, drilled holes to match the prongs and bent them over to fasten the item to the bracket. The coupling was created using a few collars and a nylon bearing. I also used 8-32 threaded rod which I need to add shrink tubbing to in order to mount it in the coupling. Hope this helps
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userhck fredan7 years ago
Nice use with the u-channels on mounting the motors. I really like that idea, and i might steal it from you, haha. But it is looking great, you are quite a bit farther than I am. Still waiting on those motors. Lol.
userhck userhck7 years ago
Also, the spring tension on the bearings is an interesting concept. Perhaps i'll try that out as well. The amazing thing about this project is it's versatility to make changes.
fredan userhck7 years ago
Well the inspiration comes from your genus. I truly like this project, I agree with your former comments. I have used a very stiff spring, as for the rails,and I have made plans to expand the length, but for now I just wanted to prove out the design. Glad you told me about lubing the rails.
userhck fredan7 years ago
Quick question, I am looking for some cheap steppers, and ebay definitley isnt the place. Any ideas people? And please dont jsut say "copy machine", i mean where would you find a copy machine to destroy?
la3bna userhck6 years ago
You can find copiers at a electrically resycling senter. I just hacked on apart to get the two steppers out. Althou i dont know if both are steppers (hmm i can really feel the steps so i guessing it is.)
Tom McGuire (author)  userhck7 years ago
Try MPJA.com here's The_Motor_Page
Pretty good motors for around 10 bucks
I was looking at this web site and I need some help on figuring out what motors to buy. There are a couple of different degree per step and a bunch of voltages and currents/resistance of coils. Which ones do I get??? I've never dealt with steppers before. Help!!
wpflum wpflum7 years ago
I did a bit more digging and I came up with something I felt might work so I ordered a bunch to play with. They are from www.allelectronics.com, part number SMT-89. Its a Oriental Motor Vexta, PX245-02B-C8 which is listed as having a 1.8 degree step. Its 6volt, .8amp 2 phase. If the picture is correct it looks like it has a collar with set screws to attact to the drive bar. It has 6 leads and is currently at 5 bucks a piece. I bit the bullet and ordered 6 so I'd have enough to build two machines. Sure hope these will work, I'd hate to waste 30 bucks but I decided to take a chance.
Tom McGuire (author)  wpflum7 years ago
I think your going to be very happy with those. I like the brass shaft couplers on them. Five bucks is a really good deal.
I thought so too. I got 6 of them, I figure I can build your design as is then use it to help make the next version. My original, and on going, reason for building this is I want to use it to help make pinewood derby cars. I'd like teach my kids some 3d design and let them play with creating car shapes in software then have the CNC machine mill out the basic shape which they can hand finish. With your current design what is the envelope? It looks like its somewhere around 6 or 7 inches and I need at least 8 and 9 would be best so I figured instead of offsetting the z axis I'd use the longer piece of pipe on each side to get a slightly bigger envelope.
wpflum wpflum7 years ago
Got the motors yesterday. They do come with the brass couplers. I'm planning a more direct method to connect the all thread to the motors, I bought 5/16 instead of 1/4 inch thread and am going to mount it in my lathe and cut off about 1 inch of threads and size it to fit the coupler, looks to be about 3/16. I'm planning on doing the same to the other end but fit that to a bearing that I can mount to the frame. Harder to get everything alligned but should make for a much sturdier setup.
hexapod wpflum7 years ago
You can return anything you buy from them within 30 days. Just follow instructions on yellow sheet. No return nubers needed just what you are returning and do you want a refund or credit. It's that simple.
Thanks!
Tom McGuire (author)  fredan7 years ago
That looks nice. Looks like you used cutting boards. The thicker the harder the flatter the better. A word of caution and not to discourage you especially because this design technique allows you to easily make changes. The bearing may need to be pressed very firmly to the rail so that the stage won't shift when milling. The spring may work but you should make sure it's very strong. I also suggest just one bearing in the center will allow the stage to travel 1/2 way to the left and 1/2 way to the right. It's also good to have the rails extend well beyond the travel of the stage. Aside from that Id like to say an awsome job and to all of you undertaking this project far out, right on - ride on.
Tom McGuire (author)  Tom McGuire7 years ago
Oh yes...and don't forget to grease the rails. That aluminum will grind into powder.
Tom McGuire (author)  userhck7 years ago
Hey nice job. That looks like it will work (so far). Keep us posted. People will want to know how it goes for you.
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