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The MeArm is a Pocket Sized Robot Arm. It's a project started in February 2014, which has had a fantastically fast journey to its present state thanks to it Open Development as an Open Hardware project. Version 0.3 was featured on Instructables back in April 2014 and we've seen it built all over the world, from its home in the UK to the USA, Mexico, Switzerland and Japan to name but a few.

We sell a kit here but all of the files are freely available so you can build your own! We're based in the UK but if you're in the USA check out the Hackaday store here and for global distributors see here.

Before you start with this instructable please check your version!

This tutorial is for the v0.4. We now have a v1.0 available on mearm.com and instructions for the v1.0 here

All of the previous versions and this can be found on thingiverse.

This guide covers how to build the v0.4. Currently there is code available for the Arduino, Raspberry Pi, Beaglebone Black and Espruino.

Step 1: Gather your parts!

The #meArm was designed with economy in mind. It is understood that laser cutters aren't the most common tools but there are more of them out there now than ever! First you'll need a set of parts. Grab the dxf and use a cnc mill or laser cutter. For the v0.3 we also had people 3D print the parts. If you get a kit from us or order the parts in acrylic you'll have to remove all of the protective covering. It's not the most fun job but the end result is better!

Next you'll need all of the screws and nuts. We use M3 (metric 3mm) standard parts. The number of these to build the latest version is:

Nut x 10
6mm x 9
8mm x 12
10mm x 3
12mm x 7
20mm x 4
Washers x 0 (we removed these as nobody ever used them!!)

You could no doubt find imperial sized counterparts, as a nation you managed to get a man to the moon with foot pounds per square inch so I'll leave the conversions in your capable hands (in case of residents of Liberia or Myamar ignore the bit about the moon).

You'll also need 4 hobby servos. We tend to use the 9g resin gear ones. The metal gear ones with the same footprint are better but they're more expensive.

MeArm is now a commercial operation (when I remember) and we do have complete kits available as well as the component parts.

<p>thanks for the fun project! i finished a 3d printed version today. excited to start programming it, just waiting for my arduino to arrive.</p>
<p>Hello Morgan This is a nice project u made... its a good one..! can you tell me how did u programmed it?? and how you control it by remote or some thing else?? can u send me some details on</p><p>latifsachalwadho@gmail.com</p><p>Thankx in advanx</p>
<p>Hello Morgan, could you send me the files as well? </p><p>rebeccajanmaat@gmail.com</p>
<p>Hello, I am interested in buildng another one of there robots, would it be possible for you to send me the file you mad so that I can make one too :).</p><p>Thank You. email: ahmad.esmat99@gmail.com</p>
I've sent everyone the files! Good luck building!
<p>Hey Morgan <em>,I</em> am also interested in building this type of project.Plz send me Relevant files and data at nnn9452@gmail.com</p>
<p>Hey Morgan, our 3d printer use GCode. Do you have .STL file of this? It would be great if you could send it to me at sabreenalo@yahoo.com</p>
<p>Did he send it to you. If so please let me know so i can ask him to send it to me too. I would like to mkae one too. Thank You</p>
<p>Could u send to me your files ? . My email is: emil.lagrangesuero@gmail.com</p>
<p>Would it be possible to share your files with me as well? My email is: luissullivan1@gmail.com</p><p>Many thanks beforehand! </p>
<p>Hi!! I'm starting a project similar to this. If you don't mind sharing your files would you mind sending it to me? navarro.i@husky.neu.edu</p>
<p>send to me also at: aravind.junior07@gmail.com</p><p>Thank you :)</p>
<p>I am trying to do this project as well. Yours came out good. Would you mind sharing your files? If not then can you please send me the drawings that you used with the dimensions so that I can draw it on solidworks. If you have the files that would be even better. email is <a href="mailto:jjuarez1989@gmail.com" rel="nofollow">jjuarez1989@gmail.com</a>. Thank you</p>
<p>I sent over the files! Let me know if you have any trouble with them.</p>
send to me also at : 1598774967@QQ.com
<p>hello friend my name is samuel, I live in Brazil and I am studying, you could send me this DXF file for me to cut into 3mm MDF for final course, my imail samuel.france@hotmail.com, since already I am grateful</p>
<p>I sent over the files to you as well :) ! Hopefully it isnt too late!</p>
<p>send to me also at : alokom78@gmail.com</p>
<p>Very cool and very slick!</p>
<p>I want to know how programming the mearm V0.4 with potenciometers y with arduino, also if you can help me for programming the procces automatic of the Mearm V0.4 with arduino. Where can meet the information.</p><p>Waitting soon answer,</p><p>Thanks</p>
<p>Great to see it can be printed! Did you find the files somewhere, or did you make them yourself?</p>
<p>Nevermind, I found this: http://www.thingiverse.com/thing:616239/#instructions</p>
<p>Yes thats where i got them as well. Glad you found them!</p>
<p>Made v0.4 from wood! i made a mistake or two along the way (put some parts the wrong way in) but found them out and now it's complete!</p>
<p>I made mine out of wood as well. I seem to be having weight issues - the two servos's which lift the head up and down seem to struggle with the weight of the head. Have you run into this problem as well? I'm trying to think of how to give my servos's a power upgrade...but all I can think of is supplying it with their max of 6V. I haven't found any other micro servos's on the market of the same size with higher torque. Were you having a weight problem with wood as well?</p>
<p>I was concerned with the rotational friction of the screws/bolts, so I used a 3 mm drill bit and cleaned out the first layer through which the bolt passes. That made the joints pivot so much easier. If one is constructing this from wood or even acrylic, I'll bet it would be a good addition to the instructable.</p>
Do you fixed it ? Im having the same issue... =(
<p>I have a laser cutter, low power that will cut up to 3mm birch plywood. I've noticed that the nut count is a mis-match for the bolt count, but that the instructions call to thread the bolts into the plastic. I would be concerned that the bolts would pull free from a wood construction. Did you experience that problem?</p><p>Do you think that applying glue to the threads as the bolt is threaded into the hole would increase the strength?</p><p>Can someone confirm that these are M3 bolts?</p>
<p>Thanks for the project! Really nice building the robot! </p>
Great project!
<p>Thank you ever so much for this instructable, I completed the build about an hour ago thanks to your help, appreciated.</p>
<p>Just finished mine! Let's see what i can do with Arduino + bluetooth + android!</p>
<p>Thanks so much for posting this project. I loved building and reverse engineering this project. I had some troubles designing my own but that is where the best learning comes from. I am very happy with the final result. Take a look if you have time. </p><p>http://www.instructables.com/id/My-meArm-Bigger-Stronger-Longer/</p>
<p>Very nice! You should call it the platypus and keep the iconic shape of the gripper :D</p>
<p>That is incredible! Have recently gained access to a Replicator 2 so might just have to build one!</p>
The gripper head still needs work. My mounting holes are a little off and the head sits at a slight angle. The main beam could use some weight reduction as well. As with any project it is a work in progress.
<p>Very Nice, thanks for the wonderfull project. We made it in colombia.!</p>
<p>Great instructions and very cool kit. Waiting on Adafruit shield to run all four servos with plans to use PSX library/controller to keep on my desk for any afternoon office doldrums. Thanks!!</p>
<p>Genial project !</p>
<p>What a great Christmas present. Constructed it in about 2hrs without any real hitch - there was one piece missing for whatever reason, anyway not a major problem as I'd downloaded the PDF template so made a replacement out of single sided PCB in less than 10mins. It took longer to make up a noddy chassis with 4 pots and 5 centre off two way toggle switches plus Arduino and Adafruit 16 channel I2C servo driver, oh and order/buy said bits. After some experimentation I decided the base servo needed beefing up so I replaced it with a Hitech 300-BB (really old but I've got a few brand new ones) - somewhat dim photos attached. Now to improve the software and get it doing something autonomously. </p><p>I have fitted the new servo without compromising the ability to put the Mearm back to original design standard.</p>
<p>Por fa los archivos, davids12_11@hotmail.com</p>
<p>friends, any of you have the table or conversion measures screws and nuts from metric to British? thanks a lot</p>
<p>thank you very much.... e đ&atilde; l&agrave;m được n&oacute; rồi ạ chỉ c&ograve;n code nữa th&ocirc;i :)</p>
<p>if You don't mind please send me the drawing with dimension along with at waqasahmad171@yahoo.com</p>
<p>what was the thickness of the sheet you used to make these parts...??</p>
<p>I made v4.0 acryl, wow I did it...^*^ I dont have joystick and moduel, So I just want to control by serialmonitor. Please send iduino program sources to my e-mail, exactly code...My e-mail : anectto@gmail.com Thank you~!!very much...</p>
<p>(sorry for my bad english im from germany)</p><p>I have a problem.</p><div>I have never worked with joisticks. and i dont know how i use this in the code and on the breadboard. Can someone help me please</div>
<p>Hi , </p><p>great project </p><p>Please could you send to me your files please ? </p><p>My email is: anybastard@yahoo.it</p><p>Thanks </p><p>AnyB</p>
<p>Hello Morgan, could you send me the files as well? </p><p>anton.anchev@yahoo.com</p>
<p>Hey Morgan i was wondering if you could send me the files connecting the mearm to the arudino uno as well? email: jihyangt@gmail.com </p>

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