I built an EDM machine
HTML-код
- Опубликовано: 2 окт 2024
- 🔴 Website 🔴
rackrobo.net
Github
github.com/Rac...
Kickstarter
www.kickstarte...
Dominik Meffort 🇩🇪
hackaday.io/De...
Ben Fleming 🇺🇸
www.homebuilte...
Applied Science video on EDM
• Drill through anything...
Rick Hartley’s Proper Grounding Lecture
• [LIVE] How to Achieve ...
🔴Attention 🔴
All the printed files can be downloaded here right now:
www.printables.com/social/631255-rack-robotics-official/models
CAD Files are included as STEP and Fusion360 Archive. All printed parts are creative commons public domain.
Is there a way to get the machine shipped to México?
Are PCB files available so the bill of materials or the ender firmware / gcode software somewhere on the net? What do you mean for "open source"?
What is the location of the PCB design files? Do you have a GitHub page somewhere?
@@V1P3RSlab The printed files have been released, and are free to download and modify.
We will be releasing the KiCAD files, GRBL files, and schematic when revisions are finished.
If that will be like the famous VORON project - this will be great, where all the parts can be obtained off the shelf in any country or from Aliexpress. I already collected for my Voron 2.4 part 2. Chinese manufacturers makes incredible help by making a prototype boards with all sensors combined, especially amazing is Bigtreetech product parts in quality, work and value.
I went into this video 100% convinced that you made an Electronic Dance Music machine
Same here, and now I have a new RUclips rabbit hole to explore.
Same here 🥲 But the engineering content is so intriguing nonetheless
It wont be long before we have an AI that makes EDM on request 😁
SHOFAR IS THE VOICE OF GOD !!
SING HIS SONG ... REJOICE !!
MARANATHA !!
~ Jesu M Christo, KMK
*Electronic
Came for Electronic Dance Music, stayed for the Metal 🤘
best comment! -
I'm still waiting for the bass to drop
I feel like having precision metal parts that you can make at home will be a great addition to 3D printing
Correction: sheet metal parts *
This is not 3D metal parts.
@@alejandroperez5368
I don't think that's what Snek was talking about.
More, adding sheet metal parts that have been made with precision would be nice to have in addition to standard 3D printing for people who have relatively cheap set up
@@alejandroperez5368 You can cut kinda thick stuff with an EDM if you got the power to do so.
@@vincentli9106 or time lllloooootttttssss of time
@@alejandroperez5368 he never said "3D metal parts". sheet metal parts are metal parts.
If it would ship outside the U.S. I would absolutely back this.
There sure is a market for consumer EDM.
I hope this turns into a product sooner than later.
Ditto.
Me too !
Since he's not shipping to EU, he simply creates demand for Chinese clones of this, which will ship.
Open Source Hardware in many of the pcb's. Where can I download the gerbers and schemas in EU, I NEED THIS.
+1
If I can offer a suggestion. To limit and control the current to the electrode I would recommend driving the PWM into an inductor. You can get extremely accurate currents without much in the way of heat losses. There is another incredible advantage to using an inductor that most people don't know about, the output voltage of the inductor will fly up when the current is interrupted such that pulse will generate a spark even if the gap widens.
That won't work as you need a sharp current pulse, and inductors drop in impedance as the core saturates. The best option is to use switch capacitors. You charge up a cap, open the charging Mosfet, and close the load mosfet dumping the charge into the work piece. You end up with a nice sharp pulse that doesn't overload the Mosfet.
I could not believe it when I checked the GitHub repository and I found the hardware schematics and layouts for the motherboard and the PCB resistor. The "EDM bottleneck" as you described it has been persistent for years, not due to the technological challenges in my opinion as much as it is due to the commercial appeal of this technology (again, just my opinion). So I am very grateful to see that you have taken the generous path of sharing your design and the results of your hard work. One crucial question at this point though is: "what are the licensing terms for this hardware?" I could see that the software is released under an attribution license, but what about the hardware. Can I start locally fabricating these machines, improve them, make a profit, and contribute back to the design? So fundamentally my question is: is this design source-available or open-source? I would encourage you to clear that up to set the tone and make it clear for contributors, what they are stepping into.
Have you been able to get an answer to your question yet? I'm also curious
I applaud your efforts in bringing this to our open source community. I am about to back your kick starter just for that but can you please include some specs? what can you machine? how fast? how long do the electrodes last etc. You are showing sheet metal work which would be an interesting thing between plasma cutting and fiber lasers but to make it practical you need to go up to say 3mm thick tool steel. Please tell us what materials you experimented with
The specs for the Powercore are simple: 72 Volts, and it comes pre-programmed for 2 Khz with a 80% duty cycle. Those settings are optimized for cutting aluminum. We do not recommend using steel or titanium yet. Thin aluminum is recommended because it minimizes the required water flushing. With a wire mechanism, and good flushing, you should be able to machine much thicker aluminum. We have not tried this yet. However, Dominik Meffert has used a similar power supply design (60 volts, 2 Khz, 80% duty cycle) to do wire EDM.
The fastest we have cut thin aluminum (0.5 mm) is 15 mm / min. We generally stick to 8 to 10 mm / min. Cuts succeed 50% to 80% of the time. We use a 1/16" brass electrode (1.5 mm). We have a gcode post processor to compensate for electrode wear by moving the electrode down as the cut progresses. With this method, you can cut a length of 800 mm of aluminum with 40 mm of brass rod.
The first hobby 3D printers could only print PLA. Then people improved the machines over time. We expect the same development path with EDM. Aluminum is our equivalent to PLA.
@@MorlockEngineering you are familiar with BaxEDM right? the only problem is that he did not open source the power supply though
@@nerdworld8211 what's 14000?
@@markos3803 BaxEDM is real EDM, if you look at the sidewall surface finish at 1:58 this is a complete joke in comparison, but a bunch of suckers will undoubtedly throw a bunch of money at it and then be disappointed later - such is the fate of every scam-starter project
@@gorak9000 You sure are going in hard on something that is described as a "rudimentary EDM mill built from a 3D printer" It's designed for hobbyists to tinker with and make things at home. It's also open hardware so (in theory) once they run their campaign they are releasing the design into the public domain. I'm not saying it might not still be a scam, but it doesn't have the hallmarks of all the dumb sh*t people throw millions at on kickstarter all the time.
Do you really need the resistor?
You could use a capacitor and series inductance to limit the dI/dt, and then switch the mosfet to act like a software current limiter. You just traded a few hours of writing code in return for halving the size and price of your device.
You'll also reduce your power supply requirements dramatically - as long as you're willing to cut slowly, you can now have a super small cheap power supply costing just a dollar or two. And even if you want to cut fast, you'll be able to use a cheaper supply because all the energy will be going into the workpiece not into a power resistor.
Give me a shout if you want me to send over a circuit and code.
hello. I'm trying to make a similar machine. I like this idea but I don't know how to implement it. Could you help me with that?
Unfortunately not available outside of the US right now but very excited to see this come to reality, I believe it’s critical for us small scale fabricators to have access to this technology. Congratulations on reaching your kickstarter goal and please keep
Making these!
Disappointing to hear.
Thank you. We have been working on this 12/6 for half a year!
Pity that its US only.
Is it possible using colisexpat ?
I can watch it in
Australia.
I've wanted to mess around with EDM for a while now. I look forward to seeing more of your progress.
Hogging out that much metal in 30 minutes is impressive.
It is many thousands of times faster than electrochemistry.
They're just tiny thin pieces of metal though.
@@TechnologistAtWork It was extremely slow with ECM material removal.
The way to think about this is that instead of a complex curved path to get a small compliant mechanism, you can get a mostly straight line profile cut, and then pressed into shape in a shop vise with 3d printed dies.
@@TechnologistAtWork even with real industrial edm machines its slow.
@@TechnologistAtWork sounds like you went in with overly high expectations.
Might I suggest you add in a "port saver" for the Pico? The USB connection port physical connection on the pico is not that great, it's micro-USB (so people will plug it in wrong twice before plugging it in right), and recessed in there, people will forget it's just a pico and tend to jam the cable in with force. A panel-mount USB port (USB-C, even?) would save the physical stress on the pico's port.
And, of course, I wanted to say that this whole thing is freakin' awesome!
Extremely cool. Designing your own PWB instead of using a power resistor for current limiting is a clever idea that I never would have thought of.
I've been kicking around the idea of a DIY EDM machine for the better part of 2 years. It seems like a fun electrical project and, for the reasons you've described, is extremely appealing for a hobbyist who does not have the space for large conventional machines.
The power resistor PCB saved the project. Without it, the Powercore would have been much more expansive. We know that there are 100 improvements like this we can make for wire EDM machines. We do not think that a wire EDM machine should cost $100,000
and here i am wanting to try the ECM conversion when he drops this
too bad i dont live in the usa for shipping
I don’t know much about EDM- but i’d just like to say I’m proud and impressed at just how much a leap rev1 -> rev2 was for your pcb! especially since it was your first design. Printed power resistor was also a clever solution.
This is impressive. And I'm pretty sure I don't even know enough about EDM to know how impresive this actually is.
It is the Makerbot cupcake of EDM. It works, but is far less capable than a $250,000 EDM.
What I wonder about is where the burned metal goes. Because that's alot of aluminium going somewhere. Is it in the water? is it vaporized? I don't want to breathe aluminium nor do I know what to do with water with disolved aluminium.
@@martincerny3294 It condenses into the water as a uniform powder.
This is incredibly cool! I have a huge soft spot for making industrial processes affordable for DIYers, but the fact that this is feasible with EDM is incredible. 👍
Backed for 600. Good job
Something like this was on my project list. But now I can be saved from that headache a support you and your developments! I really hope this goes the way of 3D printing. Can't wait to see what's in store 5 years down the road.
It's always just a matter of time before hobbyiest tackle and succeed at many techs normally only available only at industrial levels. Once somethign becomes open source a solid community developes to help improve on it. All things the big companies dread to see.
@@dev-debug Nailed it right on the head. We stopped by a commercial EDM facility today to talk with the owner. Their machines still use CD drives to store programs, and do not have touch screens. It was like going back in time to the year 2000.
@@MorlockEngineering My PC has a DVD/BR drive but I can't think of the last time I used it lol
I'm getting up there, started programming in the 70s in 7th grade. If I recall my 1st CD burner drive cost me almost $300 and my first 20 MB MFM HD was about the same price.
Anyway good luck with your project, curious to see how to works out. I have CNC mill and lathe but an EDM would be a nice addition to my shop. Maybe cut some reed valves for a pulse jet and avoid the slow etching process.
@@dev-debug Similar here. Started programming on paper tape and a timesharing service in the 60s. The tech available to hobbyists now is amazing.
Amazing. Consider shipping to Europe, I'd love to purchase one of these for my own workshop! Wish you all the success with your project! Super cool.
hint: parcel redirection services
Just some thoughts thought, While this is cool I think you may have gotten some of your information a little incorrect or not quite explained how it necessarily is
Firstly when you talk about compliant mechanisms, While they can benefit from being EDM machined they are not necessarily an exclusively EDM manufactured part. Not really even close. Methods like conventional CNC and Laser cutting along with Sintered metal 3D printing are all methods being used to complaint mechanisms, Though I'm not familiar with designs at the microscopic scale I believe it's going to use a different method than EDM machining.
That being said we also don't necessarily have a bottle neck on the EDM side for complaint mechanisms. A lot of work in the industry is moving towards Microscopic scale, or 3 dimensional objects like NASA's multi directional thruster which can't be made using an EDM machine either just from how the routing of tubes work.
Next to address your statement on injection molds. Well In industry yes we Can and will sometimes use EDM to manufacture molds, but we certainly don't have to. In fact entire careers are built around getting those parts to final mirror polish but also designing the molds because there is a lot of engineering and precision involved with making them. EDM is also slow and can't take of nearly enough material as CNC can so for this application you would need to use a CNC machine anyways to start it off and then hire someone to do the EDM work to get it to a mirror polish. There is of course the alternative of making a separate copper electrode to machine the part without needing CNC machines to make the cavity, but someone still needs to make that custom electrode to EDM into the stock material.
There's a lot of work involved with making injection molds at an industrial level so it's not really a bottle neck of EDM machines that make things expensive. It's the labour behind all of that work that makes EDM machined parts so expensive.
Overall I commend your efforts and love that you're bringing an EDM machine to the hobby market but they way you're presenting these problems really isn't the full story and a little misleading to those who might not know as much about the industry. If you really want to fix this so called "EDM" bottle neck which I would personally disagree we even have you would need to focus making machines with incredibly high level of precision far more affordable and cost efficient than what's currently available while still maintaining the same high degree of compatibility with industrial software and industry flexibility.
I want to back the project but found it is all taken. I wish there's more! Or I will get the production version once it is out.
This is really impressive I’ve been wanting to build a wire/sinker edm for a while now.
I just have two questions
1 could that power supply be used for a wire edm
2 is it possible to get a better edge finish with this power supply.
Does the finish come down to the power supply or is it a result of machine rigidity?
One more question How bad is the inference created by this power supply?
We based our design off of some work done by Dominik Meffert. His wire EDM machine is on Hackaday. Our power supply design is similar. I do not see a reason why the Powercore would not work for wire EDM. We have not had a chance to try it out yet.
@@MorlockEngineering Using a machined Graphite sinker (maybe done on a cheap 3018 type machine, or something more like a Makerspace scale CNC Router) would be neat too!
Does it have enough “ooomph” to do Die Sinker EDM?
This is great! Maybe send some machines to the big 3d printing/crafting RUclipsrs to try out, for more reach
this is amazing guys , keep it up !!
As a machinist and Tool maker and lover of all things making stuff, this excites me far more than the 3D printer ever did ❤
and yet, this stuff was made possible by commercial 3D printing
If my financial situation were different this would have been the first Kickstarter I ever backed. Amazing work.
likewise,. the best is yet to come, fortitude and perseverance, we hope for beter times for all
Same here hopefully I have some money soon! Opens up a whole new world of manufacturing possiblities
Same, once i have the money to get one (*and more bedrooms to convert into workrooms lol*) I’m DEFINITELY backing this.
And im outside the US, so I'd rather not have to bother with sending what could just as well be a bomb though an agent and paying another 20% customs to get it into the EU...
@@unpaidintern6652 Open source though so you could probably self source from the BOM and whatnot though. Albeit that is harder than a kit.
Always wanted to build one! I have MANY questions, though. Electrode errosion rate? Longer-lasting electrode material alternatives W, Mb? Tolerances, surface roughness? Smallest usable electrode (which lasts at least minutes)? Electrode erosion compensation? Bottom surface milling? Electrode errosion compensation? Software?
Pretty much all the questions I had as well.
Also are they planning to sell full systems in the future and not just the Powersupply? Any price estimates for that yet?
What about future expansion to ship outside of the US?
Like you said SOFTWARE is a VERY big questionmark for me regarding this project.
What will the pricing be like after the kickstarter?
Are they using off the shelf electrodes or will buying from them be the only way to get replacement parts?
And as a person who doesn't know much about EDM:
What's the maximum possible thickness for the material?
Which metals/alloys can/can't be cut with it?
What's the speed?
The electrode erosion rate is 1:20 for brass-to-aluminum on our setup. We have a gcode post processor that moves the electrode downward as it travels during a cut. So we are continuously replenishing the electrode. I call this, "virtual wire" EDM. In 0.6 mm aluminum, 40 mm of brass rod will allow you to cut 800 mm of aluminum. It is not as good as using a wire mechanism, but our method costs basically nothing to build.
The gcode is generated with Laser Web 4, using milling tool paths. Then we feed that gcode into the post processor.
We are really excited to see someone 3D print a good wire EDM mechanism for the Ender 3. It would be a game changer.
We have not tried tungsten-copper yet, but I hear it works well on many materials. Tolerances are mostly dependent on your setup, and kinematics. The size of the spark is 1.1 microns, so that is the upper limit for resolution. Surface roughness will change depending upon frequency, cutting speed, and rigidity of the electrode. The smallest electrode we have tried is 1/32" brass. It was too flexible to work well. That is why wire, under tension (8 - 10 Newtons), is used on industrial machines.
@@Esablaka The electrodes are off-the-shelf 1/16" brass. We recommend only using thin aluminum, unless you incorporate more powerful flushing into your machine.
I’m afraid your DIY power resistor may be too inductive
I was a wire edm operator for 5 years and a programmer for 3. What you’re doing is pretty dang awesome! It’s like a sinker edm and a wire edm had a baby and gave birth to that. I wonder how tight of a tolerance you can hold, can you control the spark gap? How do you figure out the speeds and feeds?
Do you know what happends with the burned metal? Is this thing safe?
@@martincerny3294 the metal turns into fine fine dust/grit. It is advisable to use latex gloves and not to also not dump your waste water/ filters down the drain. It’ has to be disposed carefully. When I worked at my last shop, it was fine to dunk your hands in the water and touch the parts with your bare hands. But ideally you should wear gloves. Also, don’t drink the water.
@@cheeriomartinez Dust is fine, I was wondering about aluminium oxide creation for example but I'm not a chemist so it's just me being very cautious because this machine looks exactly like something I'd need :D
fascinating! would this be able to drill into larger blocks? i only see sheet metal being worked here, and i dont expect any sort of 3d application work, but can this do long holes through solid pieces?
I did the exact same routine about 6 years ago with PCB design. From inception to working product in 8 months. What a brutal project that was, you can teach yourself a lot in a short time while in a time crunch
It was key to create formal timelines and feature lists. Our team sat down every day and listed out our tasks. That kept development on schedule. I originally tried to learn Fusion360 electronics CAD, but the file management system was unusable. KiCAD Was easy to setup and maintain by comparison.
Very impressive. Well done. I would be very interested in getting hold of one of your machines to try out. Cheers J
Very unique approach. Have kicked around the idea of an EDM for a few years for some smaller projects. Will be watching this and see where it goes.
This is awesome! Apologies if you mentioned this in the video: What's the maximum part thickness possible?
Very impressive, but no information on the thickness or type of metal limitations. .6mm aluminum (used in the video) is VERY thin (.024").
Why did you need the large power resistors or the PCB resistor? Is it to limit the current to the electrode? If so would a current controlled power supply be a better solution? You could maybe make one that is relatively high efficiency by using a buck or boost converter that has a constant current mode.
You are spot on
I thought he made a machine tha makes music since EDM also stands for Electronic Dance Music, but I am also fan of eletronics so I watched the whole video
As a former machinist who has been taking a journey into 3D printing the last couple years, this is incredibly impressive, you just gained a subscriber. Can't wait to see even more and with 13 days left, I may just be able to convince my lady to let me join the KickStarter 😅
Great idea and execution, yet another leap towards truly democratizing manufacturing! Kudos
This is a gorgeous build! The possibilities are literally endless.
Ender 3s are the Swiss army knife of makers.
Amazing build! Wish you all the best with your project and future designs, I'll be here to consume your content - SUB'D
That is extremely impressive, if it shipped outside of the US I would 100% buy it, would there be a possibility of making the plans for sale?
I wonder, if it would be possible to use an off the shelf hair dryer as the power resistor. I'm sadly not from the US, so I can not participate in the kickstarter and I'm also broke, but I wish you the best luck with your project!
Thank you so much for developing this. The world really needs it.
This comment will probably get buried in the sea of other comments, but i noticed some minor mistakes in the PCB design. You may or may not take my advice, and thats up to you. I am electronic engineer and im currently working in BLDC controller designs.
1)Use mosfet driver. Its more reliable, you can achieve higher switchin speeds and higher reliability in such noisy system as EDM driver
2)If you are using 2 or more mosfets, make sure you have same track leinght to the connector pins that leads in and out of the PCB. Therefore you can achieve higher reliability of the pulse
3)If temperatures are your concern, use mosfets with lower RDSOn value, you can even save money on using some PQFN mosfets, and with couple of thermal VIAs you can achieve cooling trough the PCB itself and the ground pad.
4)You have square wave of couple of KHZ passing right under the resistors. This is not good, it can mess up the signal, i belive Phil's Lab channel have good stuff on this topic.
5)Are you sure about those tracks between C3 and R8? :D
6)What is that GND track from Q1? Slap some via's around, and ground everything on lower layer, dont run GND tracks around :) And, also, keep them same thickness
Again, i may be mistaken, im literally just watching this video as anyone else, maybe you have everything under controll... so....yeah :)
Good luck!
length matching is really no big deal at 2Khz
Fantastic attention to detail
Your work is both functional and also aesthetically very pleasing.
Something I aspire to be better at myself.
Most of the aesthetic detail was done by my co-founder Zurad, from Zurad Engineering on RUclips. The project as a two man effort.
How do you do spark gap control? Is there feedback for the 3d printer to control the distance?
What do you do if the electrode contacts the work piece?
We do not yet have any custom firmware for closed loop control. Right now we just avoid shorts by machining slowly (12 mm / min). Any sort of closed loop control would be a game changer, especially with Klipper firmware.
I came for the EDM banger, still this managed to entertain me even better!
This one is more like Heavy Metal ..
if you want to scale up internal pcba manufacturing, you need proper reflow ovens like the T962. I've been building PCB's for over a decade and hot air guns are TOOOOOO slow. PCB manufacturers can supply you with stencils and you can paste your pcbs, place your parts and cook them in your own shop easily. EMD is cool and what's cooler is that you are making an affordable one!!!
We are using a automated manufacturer. But we want to move to using LumenPNP machines in-house after the Kickstarter! I love that little reflow oven. I am saving it to my wish list.
You've got something really great going here. It's good stuff. You'll be a multimillionaire sooner or later, this development is what people dream of.
No wobbles or bass, 9/10 machine cool but won't get me wet
This is amazing... I am absolutely dumbfounded by the limits people are pushing in the at home manufacturing technology. If you would have told me 10 years ago the things we can do from home at the price point we are able to do it at.... I don't know if I would believe it.
smart machines > dumb machines
Microcontrollers, sensors, and automatic calibration can compensate for almost anything on a machine tool. Vibration resonance tuning is an excellent example from the world of additive manufacturing.
Please build a similar ECM machine.
I thought about doing something similar some time ago. I know how to make boards, that's my actual job, but I didn't have the money to invest. What you did is very impressive, specially considering none of you had experience designing PCBs!
Are you making this open source? If so you can make this technology available to everyone which would be a freaking game changer!
Oh wow, I was actually thinking about this sort of thing not too long ago.
It would be an incredible gift to small scale fabricators if this takes off like 3D printing has!!
Also, to assist with fundraising, you might want to look into taking orders for custom injection molds/small parts?
That way various real world use cases can be tested for improvements, and reliability can be measured too.
Honestly, the price of 3D prints is really competitive. We have enormous design freedom. There is a lot less work and lead time associated with running our print farm, compared to contacting injection molders.
@@MorlockEngineering i think OP meant that it would be a good demonstration, similar to your stamping and compliant mechanism demos
Using a hotplate / resistor to limit current seems like a caveman approach.
Also Heat or Disipated Power = Wasted Power.
Couldn't you use some BJT or IGBT transistor?
Apart from that, great video, great design.
I was also looking up EDM about 6 months ago.
A good Power Supply is the key.
I don't think I've ever gone from watching a video to spending over $500 so fast. Actually, paused at 58 secs to go to your kickstarter.
Never do that - always do research first on stuff like this. I don't doubt this is a genuine project but a little prudence goes a long way
As someone who runs an EDM wire for a living, this is pretty sick. Imo u went way to thick with ur wire. Ur gonna get way better finishes and 100x the percision if u go thinner. We generally dont go over .05". U also have to be quite careful, and always use 100% pure dielectric water. That's a shock u don't want to feel.
Impressive amount of determination clearly met with incredible results!
Well done
Thank you Josh
What are some things you can do to improve the finish of the cuts? My impression is that commercial EDM machines produce a very smooth edge finish. Also, what cut thickness can your machine achieve and what metals?
commercial edm machines use a very fine wire on a spool.
This is amazing!! I can't get over how impressed I am by you and your team's work on this. Congrats on reaching your Kickstart goal!
It would help if you explained how the power supply works and what the power resistors are for.
Also, what are you using for the actual power supply? I saw something like 72v in your demo spec thing. Standard 3D printer doesn't supply that..
Maybe explain some of the underlying physics and problems with the device if you want it to take off like 3D printers so you're supplying a potential community with information and inspiration to develop on your work.. Just a thought :)
A great first step. But we need more info on its limitations.
I never ordered anything from Kickstarter, but this had me intrigued. Only to find out it's US only. Such a bummer. Do you have the BOM and PCB designs available for purchase or download?
This is super cool, but it doesn't demonstrate the REAL power of EDM technology -3D machining metal tooling.
They are only showing very limited 2D cutting and the long electrode is deflecting to take up errors in the movement/cutting.
If they can do 3D machining they can cut metal molds and complex cutting tools in hard steel!
nice work, but your aproach is wrong. You dont want to short electrode with workpiece and EDM machines dont work with high voltage, they work with high current. You need to regulate feed to maintain constant sparkgap, so you need feedback from voltage and maintain it constant for a while (voltage must not reach zero) and then do a flush (flush is something different then you mention in video and needs to be done for EDM sink or EDM drill, not for this). Also there is no EDM mill. If you want do it properly, do a EDM drill or for cutting 2D parts, EDM wire. Your finished parts are overheated, maybe from shorting with electrode. If you want it to create a kickstarter project, make it properly, not wrong.
What does the resistors do? Current limit? I am pretty sure that can be done in another way with ready IC:s.
It prevents instantaneous increases in current, which can damage the power supply. In 5 years there will probably be smarter solutions on the market. But right now this works and is really cheap to manufacture in bulk.
Great video. Thnks. BTW, what's the advantage of EDM over ECM?
I wish you could have done that on a Voron v2. would have made more sense.... moving the vat of water on a (an EDM) bed slinger just seems... hilariously wrong to do. This would be amazing though. I am highly curious if you can put smaller electrodes on there for more precise and/or faster feed rates.
mind blowing, would have bought it instantly if it where available for global shipping
You should be really careful before actually shipping your product. You need to test for EMV compatibility to get FCC certifikation. If you ever sell to Europe you'll need to test a CE certificate.
Also at least the PCB from 4:54 could use some changes as well. The Ground Plane should ideally not be interrupted. The Pico is only connected at the top over two traces and there is a trace going from the top to the bettom in the middle of the board. Depending on frequency and current that could be problematic.
I'm wondering why you need the power resister, I'll check to see if your other videos talk about it. Also .... Only available in the US? NO!
It's amazing that you don't hesitate to say that you are making electronics for the first time. And at the same time you want so much money for this children's craft. This is childish maximalism! More than one reasonable person will not play such a lot of money for these those, which you are just learning to make. First you need to get the right education, work for a year or two in any company in order to gain experience, learn how to actually build your schemes and your design without childish mistakes, and only then enter the market with your ideas and developments. Otherwise, you can ruin a reputation that will follow you all your life.
EDM is awesome, I have been waiting for a video like that for a long time.
How do you deal with erosion/deformation of the electrode?
Why is the resistor necessary? Can't you control discharge time and current through more sophisticated means? Do you have (or want) a proper electronics guy who can help?
"It is very important tot use distilled water or deionized water when conducting EDM"
Though those dancing to it rather than conducting it can just drink the regular stuff from the tap.
I'm so excited about this just pledged I have drone parts that I've wanted to edm machine for ages I can't wait to get my hands on one of these I'm going to adapt it to a trident :)
Hmm, very nice. I have been wanting to learn how EDM works. What max thickness this will it cut and at what kind of tolerance?
A good machine. Really like it. But 2-3mm rod? 0.5mm is a large cut in edm. So before I want one it's a need to go tighter.
I would totally back this, but it says you'll only ship to the states if you reach your Kickstarter amount, any chance you'll change that to ship to Australia as well?
On a scale of 1-10, how feverishly are you printing, cutting, and assembling parts right now?
Did you say you can build this EDM machine, power supply, head & bath etc for around $200?
Where do you have the circuit design, electrical schematics etc.?
I'd rather design my own PCB ^^
been subscribed to your channel for a while now and I wish you'd upload more frequently. Watching your content is like watching a mad scientist, I don't know if there's another channel doing more with less rn.
The PCB is the hardest part to get, any plans to provide the source schematics?
Being in a peripheral country, options are limited and I will have to get it locally made or made myself
I truly respect the knowledge and effort that went into this project. Thanks for the really cool video!
I'm not familiar with the circuit of an EDM. Can someone tell me what the purpose of the huge power resistor? It seems so much energy is wasted as heat, is it necessary?
Define "open source"... Fauxpen Source like the Flipper or truly open source so anyone can source and build?
So how large can the "head piece" be, can it plunge a 50mm x 50mm graphite die into a block ?????
Just curious. The kickstarter is great and all. I really love what you guys are doing. I'm not to the point of having the skills to building my own machine on an Ender 3 though. Do you guys ever plan on selling complete machines?
From what I am seeing, the Ender 3 is being used as a positioning system, and as a result could be replaced with pretty much any 3 axis positioning system. I.e. if you have access to some v-rail through e-bay or a local retailer, you could put together an x-y platform to move the emd probe that way, then build a z-axis control that moves the x-y platform up and down, rides the platform and raises/lowers the probe, or raises/lowers the vat containing the metal and de-ionized water that you're working with, the way that an Ultimaker raises and lowers the bed. Pretty much any 3dprinter control board on the market, including a RAMPs board would handle the movement. If you want to go the 'full on industrial' route, a system running Mach 4 with industrial grade stepper controllers, and such would be possible. But if you're looking at the home hobby market, pretty much any older 3d printer is likely to work, which is part of why the Ender 3 got used here. It's cheap, and there are likely to be more than a few in the region that the owners of which would be happy to part with them because they got tired of the bowden tube overheating at the hot end and don't want to replace the ptfe or put in a better heat break.
Nooooooooooo where is the music machine!?!?!?! I want u to build a Electronic Dance Machine!!!!!!
Will this be something that will be available on a website to purchase later on if I can’t afford to back the kickstarter?
What is the max material thickness you can achieve with this sort of set up? What materials are compatible?
Popular Science published a circuit in the 60s for a power supply using a couple light bulbs, capacitors and a few other miscellaneous bits. Wish I still had it.
I have also heard about that. It was a RC type supply. Our system is a pulse transistor type. There is some overlap, but we control our pulses with a MOSFET rather than relying on resonance.
Pay a HW engineer to design a proper schematic for that EDM PSU. Use a isolation barier between the LV and HV, also for the mosftet gate (opto-driver or driver with ISO). And for the layout, is still crap. In 20 hours a profesional Layouter will provide a decent layout. I would say with 5k you can fix both the schematic and the layout, to a decent level.
The layout/routing for the latest revision of the motherboard was not shown in this video. To which older revision are you referring to?
How did you get the water inlet to be the same flow as the outlet so yhe tank doesn't run dry or overflow?
Using the same connector for power and sensors is just asking for trouble.
... So I clicked on this expecting a DIY synth thing. This is cool too!
Granted I haven’t really found the “killer product” / best thing, but making injection molds for “Precious Plastic” ‘s Open Source Injection Mold machine (and similar projects/ forks) would be neat! (That and maybe dies for the extrusion one)
Agreed! If we could find a way to do desktop injection molding, that would be an epic breakthrough!
for long term use what strategies might you employ to prevent the distilled water from being contaminated from the air above it? Maybe have a lower weight fluid sit on the surface?
Pool filters are the first line of defense. To control conductivity, deionization resin is used commonly.