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Coil Gun

HiI am planning to build a small (length about 15 cm) portable coil gun. There are some really good intructables out there. (I still don't have enough knowledge of how to build this thing) I found this site to be pretty interesting. http://www.jeffhove.com/robots/coilgunhowto.html How can I make a powerful coil gun like that with capacitors (not that whole blob of camera stuff)? I am hoping that it could be rechargeable, perhaps by a USB connector (5V). But that would not last long right? So I guess by adding some batteries would help. Trying to get this coil gun to the smallest size with a powerful blow. By the way, there is something called EMF that affects the system?Thanks

Topic by J50Nunlimited    |  last reply


Coil Gun

Hello! I have a question. I have been looking at making a Coil gun lately and i had an idea for a simple one. Just need to know if it would work. Basically: Battery-->Switch-->Diode-->Transformer-->Coil For my Coil I am using a coil from a Pinball Machine Flipper. Just An Idea for makers of a coil gun.

Topic by BionicB    |  last reply


Beginner Coil Guns

I am looking to build my first coil gun. I don't have much experience with capacitors/capacitor banks. I'm looking for a recommendation on capacitors that I could use for a coil gun that would make a proof of concept coil gun that would be safe for my first time venturing into this area. Any Ideas? I would probably order the capacitors from Digi-Key rather then harvesting them from other electronics. Thanks!

Topic by T3rr0rByte13    |  last reply


Coil gun trouble

I have been trying to construct a simple flash curcuit coil gun as i have seen on the internet. I thought i had everything hooked up right but when i go to fire i get a nice spark but no acceleration what so ever. Can anyone tell me the proper materials to use and a step-by-step in coil construction and how to hook up the leads properly TO MAKE IT WORK! any incite is greatly appreciated

Question by Steve smart    |  last reply


Coil gun projectiles?

Will solid discs (think coin-sized) work as coil-gun ammunition? Or is a hole in the centre absolutely required for the eddy-currents to flow?

Question by Kiteman    |  last reply


Coil Gun Project

Hey guys, I am currently building my first coilgun, first of all, the components: Charging:     Disposable camera circuit x 2     2 x D cell batteries Capacitors:     2 x 1200uF 200V     2 x 680uF 200v     2 x 300uF 200V     1 x unknown (attached to camera circuit with no info) Switch:    250V @ 15A - 6 pole toggle (I will upgrade to some for of solid state when I have the money) Now, because I have two of each capacitor I have put one of each into a parallel bank, giving me 2 cap banks with one of each cap, I then connected the two banks in series, I have not done a lot of maths yet which I think I should but I was hoping that would give me 400v which seems to be average. The problem is, it is only charging to 340v tops, I think that may be due to the camera circuits being wired incorrectly. I have the two batteries in series, both charging both of the circuits, then the circuits both charge the caps, the + and - outputs meeting on the caps, am I doing that wrong? Also, does having 300uF caps in series with 1200uF caps hinder the bigger ones? Would I be better of with just the 1200uF and 680uF, or maybe even just the 2 1200uF in series? should I also leave the small cap on the circuit or take that off? Thanks in advance guys, any help would be greatly appreciated. I am having a lot of fun with this project and while I wouldnt like to be on the other end, it is still not as powerful as I would like, even for it's small size.

Topic by TristanD27  


Coil Gun Question?

So i have a coil gun with 5 capacitors at 330v and 120 uf. If i charge them with a 9 volt battery will it burn the camera circuit out?

Question by Kante Tech    |  last reply


coil gun help!

I am building a coil gun and i need help. what is a good material to use for the barrel? a Pen tube? i did a test using on cap and it went about six inches with barely any wire for its coils. how fat do you think i can get a small nail going with 4 caps at 300v at 450 uf? also, does the projectile have to fit snuggly in the barrel. i am using magnetic wire from a motor taken apart. so, how many windings should i have?

Topic by DELETED_DELETED_kruser495    |  last reply


Use of transformers/ignition coils in a coil gun.

I've seen a couple of suggestions that an ignition coil, or a decent sizes transformer set up in a similar way, can be discharged into the coil of a coil gun, it the place of the usual capacitor bank. The main advantages seem to be a much faster recharge time, no need to create 200+V, and the availability of parts. I only have 540uF worth of capacitors at 200V, which should work for a small gun, but I have several large transformers, and a crate full of ignition coils. Does anyone know of any reasons why this would not work, or any modifications needed to make this setup work? Thanks in advance for any replies.

Topic by The Skinnerz    |  last reply


Coil / Gauss Gun Question

Hi, I want to build a coil gun and i was wondering whether or not this design would work? For the battery i was thinking of using a 9volt, the multimeter is there so i can know when the capacitors are  fully charged, and the two switches on ether side of the battery is so i can disconnect it before i fire.

Topic by shadow4742    |  last reply


coil gun......help please ?

Ok so i am in the middle of making a coil gun i am using a disposable camera flash circuit at the charger for the capacitors an i can get it to work but i dont think i did it right for the reason it being the projectile comes out of the tube slowly and or sometimes flys back at me.... if anyone has some answers it would be a great help or even a whole new idea would be awesome to.... i love learning new things

Question by jjohnson-9    |  last reply


coil gun ammo holder

I am currently creating a coil gun within a small nerf pistol. Everything is going well, it all fits within the gun quite nicely actually. But one problem I've realized is that there is nothing keeping the ammo within the barrel (a bic pen tube)  I would like to hear some ideas on how to keep the ammunition (which is currently undecided, if that helps. I'm considering either small steel balls or nails) within the barrel until the coil is activated. It is worth noting that because of the design of this particular gun, the trigger is not a lever, but instead a simple sliding mechanism that hits a button situated right behind it. One option I'm considering is using an electromagnet hooked up to a NC (normally closed) switch also hooked up to the trigger. The magnet would keep the ammunition in place, and pulling the trigger would turn it off. I have already added a sliding switch to turn on and off the gun, and I could wire the second magnet to that switch as well. The complication I foresee arising from that is that the electromagnet may still have residual magnetism for a few milliseconds, which could hold the ammunition in place for longer than it takes the capacitors to discharge. thoughts?

Topic by berky93    |  last reply


Wimshurst Machine + Coil Gun = ?

I recently participated in my school's science fair. My project was about magnetic pulse accelerators(coil guns). I have been thinking about making a Wimshurst machine. Could I attach it to the coil of wire to get a very impressive result?

Topic by H20    |  last reply


Best voltage for coil gun?

In my coil gun project I have 36 330v 120 uf flash capacitors. When I had them arranged in 4 banks of 9 linked together in series (.5*1200*1200*1000e-6 = 720J) the projectile could easily punch through cardboard. But when I tried to increase the power by making 7 banks of 5 giving me (.5*2100*2100*500e-6 = 1100J) the projectile has trouble getting through cardboard. The coil I am using is 50 feet of 22 gauge wire. Is there any thing that I am missing? Thanks.

Question by eskibro830  


need help with a COIL GUN

    I was looking for someone to help me build my first coil gun. Everything seems to be working fine except it seems as if the coil is'nt getting any juice. The battery pack works fine, as do the capacitors. I can charge and discharge them without any problem.      I wanted to just get it working first before adding alot of power so it's a liitle on the mild side of the common 4-capacitor, 4-battery, 1/2 in. thick coil.  Here is a basic outline of what it's packing. 2 330v Capacitors 2 AA Batteries Kodac PowerFlash Circut The coil is 2/3 of an in. long with three layers making it about 1/4 inch thick. Uses a pen shaft as a barrel. Fires a 1/2 in. long steel screw.     The coil is made out of 24 gauge copper wire. The stuff we all used in middle school science were you had to scrape the ends off with sand paper or a knife. So I know it's insullated but all the help sites underline the use of "magnet wire".  Although my friend with more electronic knowlege assures me there the same thing. Oh, and i've insulated each layer with electric tape.     The way I have the circut set up I have 1 wire coming from the positive lead of the capacitor ON the actual circut to the negative lead of the extra capacitor. Then I have a wire leading from the positive end of the extra capacitor to the first end of the coil. To fire, just connect the other end of the coil to the remaining lead on the first capacitor.     I can only think of a few reasons why it would'nt work from just not enough capacitors to too small a coil, or just perhaps how I have it set up. I've also experimented with the position of the projectile but to no avail. It won't even budge.  I've included a rough drawing of the circut in this post. Help me instructables forum! You're my only hope.

Topic by darthDIY    |  last reply


need help for coil gun

I want to make coil for coil gun.i have 21awg copper wire (0.7mm), 250v 10000 microfarad capacitor.How many layer for the best velocity ? 

Question by Rendydevara    |  last reply


making a coil gun help

When i make a coil with magnet wire,i have enamelled wire, do i have to sand the whole thing so the copper touches in the coil, or just the ends going to where im hooking it up? EDIT: i changed my title, because i have more questions about coil guns in general.

Topic by um0123    |  last reply


Coil Gun Charging circuits?

Ok so i made this coil gun using a camera flash circuit but im using 450V caps so the circuit only charges to about 330V how would i step up the voltage in a cheap way. Buy another camera circuit or build one? If you need any more info just ask and thank you.

Question by rocket_man  


how to build a coil gun

Good day , I would like to build a coil gun but I don't want to use the disposable camera method I want to build my circuit from scratch  , I'm asking for some guidance , can you help me please 

Question by franzakeem    |  last reply


Coil Gun / Grappling Hook.

Hey Everyone!  I am kind of an amatuer prop designer and I've recently been taken with pocket sized coil guns. My question is quite simple: I would like to know what disposable camera (brand) contains an LED indicator that flashes/turns on when the capacitor is fully charged? I've seen one such disposable camera used in this post: https://www.instructables.com/id/The-Coil-Gum/ I would love to know the exact brand or alternatives.  I would really appreciate any and all help and would love to post the resulting product. 

Topic by notnowmyheadhurts    |  last reply


A Hybrid of Coil and Rail gun

So I said i'd throw this up in the comments section on Youtube not too long ago, and I don't like it when something easy and free doesn't happen. This is some ideas and observations that have to do with coil guns (mostly). I'm in the process of finishing up several projects, so my resources are kinda spread out. I should have a prototyped coil gun finished in 2-3 weeks though, so if this doesn't clear things up, hopefully that video will. I should point out, I am a chemist with expertise in biochemistry, not electrical engineering. Basically my idea is to combine a railgun and a coil gun for the expressed purpose of avoiding the pitfalls that a pure coilgun or a pure rail gun have. At present, none of the designs out there would be capable of competing with an actual gun. By mixing the two, i'm hoping to get something that might eventually be capable of doing so. So.. I've included a very poor drawing (I'm not an artist). The barebones circuit is sketched in the lower right hand corner. The gun barrel, which is a piece of aluminum tubing split into two pieces to sever as a rail system, is sketched in the upper left, and again in the middle figure to show how to integrate the coil and rail system. Looking at the circuit design, you can see that this starts off as a very basic capacitor-inductor circuit. The charge is purposefully allowed to trickle through the circuit until the coil reaches saturation and the capacitor(s) are charged. When the trigger is pushed, the inductor side of the circuit has to dump into the rail system to complete the full closed loop. Because of the ferromagnetic material (the brown stuff), the magnetic force persists for a while (that is to say, it has high reluctance). The ferromagnetic material does one other thing that is important here. It forces the middle of the coil to be far off center. The coil is pulling the projectile into the middle of the magnetic field, but that is not necessarily in the center of the winding. Adding ferrite, or other high reluctance material, towards the end of the barrel biases the field towards that end.  At the same time that the coil stops getting current, the rail system become active. This allows a charge to pass through the bullet/projectile, and, even though the majority of the force is going to be caused by the inductive coil, the rail system allows an eddy current to setup in the bullet. This does several things. First the bullet doesn't have to be iron, nickel, or cobalt. With a stray eddy current in the projectile, any conductive material will work. The advantage here is that once the current stops, the non-magnetic material stops being  to the magnetic field, preventing backwards acceleration of the projectile as it exits the barrel.  Second, Rail systems and coil systems are not often used because they are perpendicular to one another, but, this can be used to put spin on the projectile, in a similar manner to rifling in a barrel.  After the projectile is fired, the circuit is open, preventing excessive electrical discharge.  My circuit design is really badly drawn... =T if it needs more explanation please post up questions. 

Topic by Qcks    |  last reply


Multistage coil gun power switching?

How can we switch power between coils on a multistage coil gun setup (3, for example)? What i am reading out there is people using physical switches to infrared sensor but i couldn't understand much especially on how can we implement it. I'll be grateful for any explanation anyone can tell me to. Thanks! Sorry for my bad english :)

Question by Vigasto    |  last reply


Stungun for power source for coil gun?

I’ve made a coil gun out of a disposable camera (utilizing it’s capacitor). It shot bbs about 3 inches, and then they’d roll along the floor. To get coil guns to work you need a high voltage, discharged quickly. I’ve seen there are cheap stunguns on Ebay you can buy for $12-$15 shipped. In the 2.8 million volts range. I think they have enough voltage to propel a bb pretty good, but my question is do they discharge fast enough?  

Topic by G.A.Pster    |  last reply



Use a computer power supply to power a coil gun?

The summer bored-ness has finally kicked in, and I would like to build a coil gun. The usual idea is just to charge some capacitors, and then discharge then into a coil, but it is possible to use the 3.3v rail (or any rail) of a standard computer power supply to power a coil gun? The goal to have rapid fire ability (which is hard to accomplish with capacitors due to charge time), and not use a transformer (because I am to cheap to go and buy a decent one from Radioshack, or any other store)

Question by secondstage    |  last reply


New Group!

Hey Everyone!!! I just created this group so we can all start researching coil guns :D Request to be in this group. everyone is welcome :D

Topic by rogueleadr    |  last reply


how much would this cost all toghther?

Im just asking how much money you need to actually make it.

Question by dehlome    |  last reply


Space Elevator or Lateral Coil Gun? Answered

What would be a batter way to get off the earth, Space elevator or lateral coil gun?

Question by nfarrow    |  last reply


Coil gun doesn't work help?

I used about 5 ft of 22-24 gauge insulated(thin) wire(single strand)and coiled it into about 1 inch long coil, the power is about 170VDC , when I test it out nothing happens, My ground is soldered together and I test it by connecting the positive to the other end of the coil, there is a spark but no projectile i try moves at all.

Question by tom10122  


How to use a SCR in a Coil Gun?

I want to increase the power of my capacitor but i can not figure out how to add a SCR. So i was wondering if somebody can show me how.

Question by Kante Tech    |  last reply


Does anyone have an instructable for a coil gun using multiple coils?

If anyone could link me to a site that has a circuit diagram for a coilgun with multiple coils I would be much obliged, as I have designed what I think the circuit should look like, but I am not 100%, and so before I waste time, money and effort on building this thing I want to check that it's right. If you can link me to an instructable-esque site, that would be awesome, but anything is fine.

Question by jimbo112  


Using LiPo batteries in coil guns

Hello all, this is my first post! I have been theorizing for a while about coilguns, and have been doing calculations. here is how it goes: A single Lithium polymer battery can hold up to 3.3 Ah and discharge at about 30c (safely). We multiply 3.3Ah by 30c and get 99 A of continuous discharge. That’s a LOT of current, but, it is still not enough to fire a good projectile. So, I’m planning on having four of these hooked up in parallel to give out 396A. This is quite a bit of dangerous current, so my wiring will have to be gauge-perfect. The magnetic field that this produces is about 9.9 teslas, as  twice much as your average MRI machine. Yes, I’m utilizing a miniature MRI to shoot stuff. If you want to know how much force an MRI puts out, here is a great video to show you https://www.youtube.com/watch?v=6BBx8BwLhqg. I am planning on having a 2,000 turn coil, with the average distance from the projectile being 1cm. The ammunition is going to be BB bullets, which means our cross-sectional area is at least 7.65*10-4m2. Using those numbers, the initial force on the BB is 3,015,030N. This is enough to lift up 25 semi-trucks. On paper, this seems magnificent. However, I’m accounting for about 2% efficiency, taken into account at this step, giving us 60,300N. This is still an enormous force to take to a .5g BB I’m implementing the Impulse to be .05s using standardized E = F * t,  this gives us 3,015 joules of energy. Huh. that’s way more than we should expect. Let’s take into account the 2% efficiency rating again, and we get a more realistic number: 60 joules. 60 joules is ridiculous for a BB pellet. We’ll use Ek = 1/2*m*V2 to solve for V. I got about 1,553 m/s. This is faster than most guns shoot regular bullets. I will be using a 2-stage setup, and will make sure to  use proper electrical equipment. My question to you is; How accurate are these calculations? if I build this thing, what can I excpect?

Topic by bjohnson45    |  last reply


help with a coil gun (or linear accelerator)?

hello, i want to make a coil gun (or something) where is a good place to get capacitors (short of buying them of coarse)? any help (nomatter how off topic would be lotsa help) thanx!

Question by cheesewzrd    |  last reply


can a coil gun be made without the camera?

I want to make a coil gun but i don't understand why there is a need of a camera?

Question by Pranavthegreat    |  last reply



Could a coil gun's projectile escape earth's gravity?

If there were a Coil Gun, that was built to go across the United States and Canada border, for 2000km in a horizontal line, that would end at the end of a 'tunnel,' the projectile should hit escape velocity 11.2km/s and be out of the earth's gravity's field?Coil gun launch cost964 MEGA watts 10 cents per kwh (wholesale) from a power station$9,640,000.00 per launchNASA Space Shuttle launch costhttp://www.nasa.gov/centers/kennedy/about/information/shuttle_faq.html#10Q. How much does it cost to launch a Space Shuttle? A. The average cost to launch a Space Shuttle is about $450 million per missionhttps://www.instructables.com/answers/Space-Elevator-or-Lateral-Coil-Gun/

Question by nfarrow    |  last reply


Where can i get a piece of .22 (5.5mm) pipe??

I really need some have any idea where from?

Question by highvoltageguy    |  last reply


What kind of switch is best for a coil gun? ?

Im making a coil gun for a final project and I am wondering what kind of switch to use to fire the gun. I cant find a powerful enough switch, the highest rating ive found is 480v but they just burn out. I'm using a knife switch know but it robs a lot of the potential power and the gun doesn't shoot as far. I am using 15 300v 100uf capacitors in parallel

Question by Emsaid    |  last reply


Tesla Ray Gun (Bwahahaha)

I have other projects going right now and I probably wouldn't even attempt this if I could, but is it possible to use a small generator, in a backpack, to power a 15kv transformer, to power a gun similar to a Tesla coil? The user would obviously have to wear some sort of protective suit and be well grounded, and there are a butt-ton of holes it the idea. I'm just throwing the idea out there to see what happens. Any input would be appreciated. Oh, and again, I'm not doing this project, as I would likely die horribly, so neither should you.

Topic by martzsam    |  last reply



I'm wondering how easy is is to make a capacitor for use with a coil gun?

I would like to build a coil gun and have it run off capacitors of my own make but i'm wondering what i should make them out of and what medium i should use like maybe a salt water lemon juice mix or some acid or alkaline solution or a oil I'd prefer vacuum from what I've researched but i have no idea how to make a vacuum cap I'm a broke mad scientist

Question by Sessha    |  last reply


How many capacitors of 3.15 uF will it take to run a 250 volts magnetic coil in coil gun?

I am Making a Coil Gun in which i have 4 Capacitors of 3.15uF to run a magnetic coil of 250 volts so i am asking how many capacitors of 3.15 uF will it take to run a magnetic coil of 250 volts

Question by siddharths067    |  last reply


Tesla coil and spud gun vs. Chrome

Google made this slick video to show off just how fast Chrome can render web pages. They compare it against a spud gun, a speaker filled with paint, and a Tesla coil. Check out the video to see the lovely slowed down footage and the second video to see how it was done. making of

Topic by fungus amungus    |  last reply


Infrared Detector

Hello Everyone  I'm making a coil gun and not sure how to make a infrared detector, so when my projectile is going down the barrel an infreared sensor will detect the projectile and activate the next coil. Thanks Everyone 

Topic by jackopiny    |  last reply


Aluminum Slugs for coilguns?

Throwing around the Idea of a Coilgun , can I cast some aluminum slugs to use with it ?

Question by tom10122    |  last reply


Would anyone be able to help me on a Coilgun?

I'm 17 and building a coilgun. I have prototypes but i have so much power going through it so far that i burn up the charging circuits... 

Question by Ausi319    |  last reply


could i use this for a coil gun cap bank?

If i soldered all of these together would it work well for a coil gun.  http://www.goldmine-elec-products.com/prodinfo.asp?number=G16918B Thank you in advanced

Question by rocket_man    |  last reply


can i power a coil gun with 11.1 v with 4400mah with a c rating of 50?

I have 2 x 11.1. volts 2200mAh in parallel which gives me double the current but the same voltage. will this power a multi staged coil gun?

Question by icey.hood    |  last reply


I am trying to make a coil gun but I need a simple designs. Answered

Sorry I am lazy I need some simple designs for a good coilgun. I dont want one of those bulky boxes but one that acual looks like a gun. Thanks.

Question by Rebreg    |  last reply


[Coil-gun]What is size coil will work best with my capacitors?

I am building a Multistage coil gun and have some 450v 1000uf capacitors. I understand it is important to have the wire size and amount of turns correspond to the capacitor for maximum performance. I have also figured out that the coil should be about twice as long as the projectile. My projectile will be part of a nail.What gauge wire should I use and how many turns should my coil be? 

Question by eskibro830