Picture of coilgun blueprints
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This is a relatively simple coilgun me and my grandpa made this summer. I will show you how to make a similar one. Please add a comment if you need extra help with anything. Also, add a comment if I need to change any of the steps.Please rate and comment, andplease help me if i'm not clear on something. It takes about 1:30 to 2:00 minutes to charge.  Have fun!

-around 90 feet of magnet coil
-2 1.5 inch plexiglass washers for winding coil
-1 camera charging circuit (KODAK)
-1 on/off switch
-1 40 amp or higher toggle switch for trigger
-1 D battery holder
-1 capacitor around 450 volts and 1500 MicroFarads
-1 toy gun large enough to mount the circuits in
-1 carbon arrow shaft
-you may need other materials according to the gun apparatus you use

-soldering iron with solder
-screw driver (to take the gun apart)
-a hand saw (to cut barrel to appropriate length)
-glue or drill and screws to mount circuits

Step 1: Wind the Coil

Picture of Wind the Coil
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Wind the coil as well as you can around a axle a little bit bigger than the barrel. Fasten the washers around the axle for support. You may use you hands, but my grandpa and I made a little rig to make it easier. Wind it 2.5 inches in length, with 10 layers of coil.

Note: Before you go to the next step, you may want to rig a testing circuit to make sure the coil fires.
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chubby81 year ago
1500 micro farads is plenty. That's roughly the same as 10+ average camera flash capacitors in parallel.
And at 450v, holds about 150 joules of energy.
Eneergcam, you could try do a simple switch using an SCR or MOSFET , just check its voltage and current ratings. They should be able to handle the current that killed the relay.
How Mtrsym?
Very good job!
N3v3rm0r35 years ago
man, only one KODAK sircuit? it would take ages to charge that capaitor, i used 7 to charge two capacitors 250V@1000uF and they are cherged at around 10sec. one 250V@1000uF takes 1min to be charged by one KODAK sircuit, my opinion is that you should use at least five sircuits.
how exactly do you wre several circuits tigether? if you could post a link to an instructable or tell me that would be awsome.
wouldn't you put them in parallell.
There is an instructable called Coilgun Handgun that also shows you how to shrink the KODAK blue circuits.
eneergcam (author)  N3v3rm0r35 years ago
 we decided just to have one for our first gun, and we didnt know where we could put them, but maybe one day ill make one with a few more circuits
Badjuju19963 years ago
would you be able to add a sensor or something that when the projectile passes by it shuts off the magnet, that way you could increase the efficiency and make it stop dead center
eneergcam (author)  Badjuju19963 years ago
hmm thats an interesting concept, my coil gun making days are over but maybe you could look into adding a reed switch or something of that nature into the circuit
tazerboy4 years ago
hmm, i suppose that i wasn't very powerful since it only had one capacitor. You
might want to add a couple more of those, say at least 4 of the same caps.And get a better switching device like an scr.
eneergcam (author)  tazerboy4 years ago
Nah dude, it was a big capacitor, and it packed a punch
but you said to somebody that the capacitor is small and now your saying its big makes no sense.BIG or small.
eneergcam (author)  Iwantbigboom4 years ago
Its all relative, compared to the camera circuit capacitors if very large, but compared to other larger ones, its small.
tazerboy4 years ago
plz tell me the voltage and capacity
eneergcam (author)  tazerboy4 years ago
450 volts and 1500 MicroFarads
ampeyro5 years ago
when i vas "studying" about coilguns for making one, i read something about if you conect a capacitor to a coil, it generates AC, and inverted voltages can damage the electrolythic capacitors, does it realy happen?, did you add something to avoid it?, is it just too small to be considered?
(yes, my ortography is realy bad, but i'm not native english speaker)
eneergcam (author)  ampeyro5 years ago
I dont now where you read that, but you dont need to add anything, the voltage is probably too small, and the capacitors are also very small.
thanks, i read it on the wiki
add a diode between coil and capacitor!!
That is really not safe you should be using a relay instead of a regular momentary switch like that. It doesn't matter how many amps it can handle those kinds of switches are intended for a constant flow of energy not sudden extreme bursts like this. Other than that its a great ible. 5*
jesus where did you get your capacitor
i used a bank of 10 500 V 2400 uF nippon chemicon capacitors. it shot a 1/2" bolt through 2 walls of my house
dam im gonna mimic your bank
these babies are available in tv's (older ones)
in old tvs the biggest i have found is a 220uf at 400v
eneergcam (author)  themodmancarl5 years ago
hahaha, my grandpa had it in his infinite pile of junk
Taran6065 years ago
Wut if I'm using pure bare copper wire and I'm using my iPod touch and it has a small keyboard
Using pure bare copper wire will result in a short. Your gun will not fire and you may ruin your capacitor.
eneergcam (author)  Taran6065 years ago
uhm, for the coil? it wont wont NEARLY as good, but it will work, and yeah, i know how that goes, I always mess up typing with my touch on facebook...
Taran6065 years ago
Srry to bother u but it's my first rime. Can the tube that the progectile come out of be made out of conductive metal
eneergcam (author)  Taran6065 years ago
it could, but i think a plastic one would be better, because it wouldnt interfere with coil
Ok and I'm using a one of those other switchs that u flick
eneergcam (author)  Taran6065 years ago
okay, sounds good, but make sure that on the package that the switch comes in that it says something around '10 amps'
check my instructable for better pics
eneergcam (author)  Taran6065 years ago
alright, looks great!
heres the pics
I do have two triggers one to charge other to fishgare to coil and another proplem many be my circuit us like half that size
eneergcam (author)  Taran6065 years ago
it is getting pretty hard to read your comments, haha, and that shouldnt be the issue if it charges well.
Taran6065 years ago
Hi I got a question. Why can't you cut off the flash and pit the coil wire there instead of putting it strait to the cap. If you could answer I wold like it. Plz leave a comment on my channel Ty. Taran606
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