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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


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


Building a full auto coilgun

I've been working on this project for about a year now, the first stages of the design started like 5 or 6 years ago. It is a full auto 19 stage no-capacitor coilgun. The accelerator is 3ft long! It will use an advanced coil timing system that should allow more efficient acceleration. The custom 3d printed magazines will hold about 90 shots, maybe a little more. It should be capable of firing at a rate of several thousand rpm but I might tune it down to ~500 rpm to keep it cooler running and make the ammo last. If you want to read more about this design you can see the page on my website: http://www.ourbadscience.com/#!em-guns/cwjy Here is a video showing the current progress on the coilgun:

Topic by Jaycub  


What part of a coil gun generates the most heat, and how much?

Im building a single stage handheld coilgun, and im being cautions of heat issues, (because burning myself is less than fun) so i was wondering which part (ie the coils, or the caps. etc.) generates the most heat so i can whack a heatsink or cover over it.

Question by - Jordz -    |  last reply


How can I improve my coil gun's coil? Answered

My coil is made of 22 gauge wire and the inside diameter is about 1/8 in. It's 1 3/4 in long with about 7 layers. The ammunition is a little over an inch and fits snugly inside the coil. How many more layers should I make it, and what else can I do to improve it?

Question by cardboarddude    |  last reply


What capacitors would be better for a coilgun?

I have two sets of capacitors i could use for my first coilgun, and i was wondering which set would be better and why?(2200uF - 16 volt) <---- Old computer cap.or(120uF - 330 volt) <---- Regular camera cap.

Question by - Jordz -    |  last reply


Arduino high voltage capacitor charge indicator?

I made a 330v gauss gun and wanted a way how to know when capacitors charge, at first i took an led and resistor, that worked but is kinda boring. I want to use arduino and lcd to display percentage which should look more cooler. How should I measure the capacitor bank voltage with arduino? Should I use voltage divider? or there is a better way?

Topic by spudziuvelis    |  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


how can i make a railgun with a taser?

Theres lots of instructables about how to use capacitors for it, but i have a high powered stun gun, with more volts than any camera circuit capacitor bank. 1,800,000 V or 1800 KV. i know there has to be a way to do this. considering a camera capacitor only has about 330 V.

Question by mikmkt93    |  last reply


can i power a multi stage coil gun with 22v lipo with 2200maH?

I know i'm late on the coil gun band wagon but its still interesting to build. i have all the parts to make the gun (circuit wise) however with my power source, i don't know how many turns i have to do for best efficiency.. i have 18 AWG wire i intend on making my projectile 1" long and 7 mm Diameter. so the the coil diameter will be 7.5-8  mm.   thanks for help in advance, even a simple equation is welcome

Question by icey.hood    |  last reply


My trigger switch keeps breaking on my coilgun please help, how do i fix it?

I am not sure what rhe joules and what not are, i have 4x caps with 420V and 100uF and 1x cap with 330V and 120uF. the gun works fine, i have 6 layers of 22 gauge coilabout an inch long. i have gone through 1 momentary button, 1 small switch and one big high voltage switch for the trigger. what do i neecd to do to make my triggers last. i think they are melting inside. too many amps? how do i fix this. before they break they smell bad and have late trigger reaction.

Question by mikmkt93    |  last reply


23 stage no-capacitor full auto coilgun

  *********I have updated my design since posting this topic. The video is the more current design than what is written below.**********    I came to the conclusion that using capacitors to provide the power for a coil gun is a stupid idea. A bold statement I know. The reason is that they are big and heavy, take time to charge, and need charging circuits. Also, the sharp rise in current that comes from capacitors is bad unless you are making an induction style coilgun, because the induced currents will hurt efficiency.    If coil guns are ever going to be a practical hand held weapon it will need to be lighter, simpler / less delicate, and more powerful than what you will find on the internet if you look up coil guns. A rate of fire that is competitive with conventional guns will also be needed if a coil gun will be used for anything other than target shooting or maybe hobby hunting. So I designed a coilgun to meet these requirements. Visit my website for a full explanation of the design: http://www.ourbadscience.com/#!em-guns/cwjy     I realized that a coilgun would not be a practical infantry weapon until batteries are more advanced anyway, so that just adds to the list of why capacitors are out. It will be powered directly off of the batteries, and have many coil stages. This allows a very high rate of fire. To get that rate of fire with capacitors you would need several capacitor banks charging at offset times, so after each bank fires another is just finished charging. That would be terribly bulky.    The lower voltage from the batteries will give comparatively slow current rise in the coils which normally would make the coil timing weird. I plan to use an unconventional coil timing though. All the coils will be activated at once, and the coils behind the projectile will be shut off as it passes them. This will have several advantages: -The coils will only be powering up for a split second at the beginning. Most coils will already be at full power when the projectile gets to them (that is not the case in most coil guns). -Induced current will not be any issue. -Since the coils will all act as one coil, the projectile will be drawn toward the center of all the coils that are on. Timing of the shut off of the coils will not need to be perfect.    This will be a pre-tuned passively timed system. I want to use a small adjustable electronic timer for the switch-off timing. This will require some work in the initial adjustment of the timing, but even actively switched coil guns (with optical sensors or something) require that. the advantage of a passive system over an active system is cost and simplicity, and you can pack the coils tighter on the barrel if you are not putting a sensor between each stage. That matters with 23 stages! As I said check out my website to see more details and pictures for this and other projects: http://www.ourbadscience.com/#!em-guns/cwjy

Topic by Jaycub    |  last reply


High efficiency coilgun design

Hello there I need some (a lot of) help with my project. I've started to design a high efficiency multistage coilgun. The main feature of the design is using the self-inductance formed in coils that were shut down for accelerating the following coils. To perform this, we can divide each coil into 3 segments (lets call them subcoils), connected with a wire and power all them 3 with a single capacitor. At first, the current from the capacitor is flowing through all 3 segments and a projectile is being pushed through the first segment. Than the first sensor is being activated with the projectile and it switches the power flow to only second and third subcolis As the current in the first subcoil is changed, the self-inductance directed in the opposite direction is appearing. In theory, we can use this power to increase the current in the following segments. The same thing is happening between second and third segments. And I want to place 3 of this stages (9 subcoils in total) I will use 8mm caliber projectiles, 40mm or 50mm length. I chose 5200mkF 450V or 6800mkF 400V capacitors, 2 of them in parallel for every stage (6 capacitors in total) Yes, I know it sounds way too powerful, but that's my actual goal. It's not my own idea. I have learned it from here http://gauss2k.narod.ru/adf/gs3seg.htm (русские вперёд). So, some problems had appeared. I can't figure out how to properly calculate the required inductance of the coils. In the source it is said that the inductance of the first subcoil should be equal to two of the second and the third subcoils (L1=2*L2=2*L3) to achieve the best performance. Also, my rough estimates show that peak current through the coil will be about 1,5-2,0kA for 3,0-4,5ms. This is quite a lot! I'll have to manage this energy and choose the power switches rightly. To sum up, I will be glad to hear your opinions about this idea. It's kind of controversial, but I hope it's not a certain failure.

Topic by CosmoKnight    |  last reply