| Author | Message | ||
     ABCinventor Unregistered guest |
How exactly can i build a coil gun???(non-magnetic projectile) Is it by passing a very high charge to a solenoid with a non-magnetic projectile at the end (maybe on a rod)??? how can i charge a capacitor to store high voltage and lots of current with just 4 AA batteries? Please help me with this one. i am currently taking part in a science fair that focus on projectile. The one that achieve the longest range wins.i already have a water rocket undergoing, a hydrogen rocket, few ideas about launching BB bullets from the expansion of gases in the hydrogen filled film canister and so on. but i need to test each of them and decide which one is the best.\ Please refer to these sites: http://www.americanantigravity.com/pulserifle.shtml and; http://forum.4hv.org/index.php?board=5 | ||
| Simon Quellen Field (sfield) Advanced Member Username: sfield Post Number: 259 Registered: 12-2004 |
A coil gun relies on a magnetic core in the coil. A rail gun is what uses the non-magnetic projectile, but it is unlikely that a home-built rail gun will surpass the range of the rocket. If you have a large capacity high voltage capacitor (a dangerous thing to play with, by the way), you can build a circuit to boost the AA cells to a high voltage, and then charge the capacitor with that. It will take a while. Note that you won't be able to put more energy into the capacitor than is in the batteries to start with. You can also use two capacitors to get high voltage. Charge one with a battery. connect it in series with another battery and use it to charge the second capacitor to 3 volts. Connect the capacitor with 3 volts in series with the battery, and use that to charge the first capacitor to 4.5 volts. Repeat as long as you like, getting an extra 1.5 volts each time. You can build a circuit to do all the switching and connecting for you. | ||
| ABCinventor Unregistered guest |
Wow! But building one of those switching circuits can be difficult and requires a micro-controller? And so that's where the "1 minute wait" came from. I was woundering.... Q=CV If a 24 V,16000 micro-farad rating capacitor were to be charged with just 12 volts, will it still be 16000 of capacitance Meaning: Q=CV If charged at 24V, Q=16000uf*24 Q=384000uCoulomb Q=0.384 If charged at 12V Q=16000uf*12 Q=192000uCoulomb Q=0.192 Or is it: Q=8000uf*12 Q=96000uCoulomb Q=0.096 Do charge decrease when charging voltage decrease? Or does it stays the same, only voltage change? Also, how do camera flash get the high charge? Does it use the switching and connecting circuit too? | ||
| Simon Quellen Field (sfield) Senior Member Username: sfield Post Number: 312 Registered: 12-2004 |
The circuits for generating high voltage are not too difficult, and do not require computers. Google for "high voltage circuit". The capacitance does not change with voltage, but the charge does, as does the stored energy ((C * V * V) / 2). Google "flash circuit" to get articles like this. | ||
| ABCinventor Unregistered guest |
hey this(http://www.discovercircuits.com/P/photoflash.htm) is a great site ,teaches how to build high voltage circuits from SCRs. | ||
| Jacob Unregistered guest |
I`ve just played aroud with a simpel coilgun - just using a old camera flash. Just put a coil in a serial connection with the flashbulb. Youll get both a flash and a "coil-gun"-firring at the same time... | ||
| general antilles Unregistered guest Posted From: 209.178.139.32 |
i to, am playing around with coil guns, and been through the initiation prosses of being zapped, and i am still trying to fing out how to charge multiple varying capacitor banks bought from radio shack. but if you are trying to build a coil gun, i suggest not using a flash camera circuit. it only flies a few feet forward, much to the awe of spectators, but to your dismay at its poor preformance. | ||
| help u Unregistered guest Posted From: 207.69.138.199 |
the best way to convert the electricity is use the same basis of a stun gun | ||
| jason (Unregistered Guest) Unregistered guest Posted From: 24.51.236.116 |
I'm 11, but if i could get a schematic for a simple, medium power coil gun that runs on AA batteries? or maybe one that runs on 9 volt batts. Also, i found a neat article about rail guns on howstuffworks.com | ||
| MadScientist (Madscientist) Senior Member Username: Madscientist Post Number: 111 Registered: 4-2005 |
I hate to burst your bubble, Jason, but a few AA or a 9V battery, will not be enough to do much more than move a small ball bearing several feet, and at that, not very fast. You will need much more energy than either of them can provide, quite possibly even to see the concept take place in front of your eyes. Even if you extracted and stored the entire supply of energy that one of these batteries could provide, you would not see much. Railguns, as a general rule, require vast (and dangerous) amounts of energy. Stick with the demo on this site (http://sci-toys.com/scitoys/scitoys/electro/railgun/railgun.html) for demonstrations of the idea. Above this requires dangerous amounts of energy being stored in capacitors that should not be played with until you have a full understanding of the energy involved. If you're really curious on the subject, look at some of the results on a google search such as http://www.powerlabs.org/railgun.htm, or just type 'rail gun' into google and follow the links. | ||
| devyani varshney (Unregistered Guest) Unregistered guest Posted From: 59.144.185.32 |
i am a 9th class student and i want to make coil gun that is used to launch sattelites in space.can you give me a simple method to build a coil gun. | ||
| Simon Quellen Field (Sfield) Senior Member Username: Sfield Post Number: 777 Registered: 12-2004 |
Google is your friend. | ||
| charlie webb (Unregistered Guest) Unregistered guest Posted From: 213.249.155.233 |
heres a very simple tutorial http://www.angelfire.com/80s/sixmhz/cgkit.html also power labs have just done 2 coil guns: http://www.powerlabs.org/coilguns.htm | ||
| jason rucks (Rucj0131) Junior Member Username: Rucj0131 Post Number: 4 Registered: 10-2005 |
I have three, 35 volt, 4700 uf capacitors, and I need to know how to connect them to form a simple coilgun circut. There are arrows on each capacitor, but I am confused about which side is positive and negative.If I want to combine them together, do I connect them positive to positive, or negative to positive? Do I need a special transformer to change from 1.5 vdc, 6 vdc, or 9 vdc, since it is a 35 volt capacitor? I would like to have a schematic, but just about anything will help. I have those three capacitors,a momentary switch,the pc board,batteries, the coil(already wound and ready), but I need to know what else I need, and how to connect it. | ||
| jason rucks (Rucj0131) Junior Member Username: Rucj0131 Post Number: 5 Registered: 10-2005 |
If it is not too much trouble,could someone respond as quick as possible? I want to have it done two(or more)weeks before my birthday, Jan.31. If you have any pictures you can send them to my email: debrucks@adelphia.net ,or you can just post them here. it is also okay if you include links to other websites. Thanks, Jason | ||
| devyani varshney (Unregistered Guest) Unregistered guest Posted From: 61.246.8.113 |
the sites you gave i have already visited give some more precise sites according to my class-9 | ||
| Simon Quellen Field (Sfield) Senior Member Username: Sfield Post Number: 880 Registered: 12-2004 |
I know of no ninth graders who have built coil guns and sent objects into space. | ||
| devyani varshney (Unregistered Guest) Unregistered guest Posted From: 59.144.185.14 |
i dont want exactly to make a coil gun but yes a coil gun that can atleast shift the satellite 2 inches above. | ||
| Angelo (Unregistered Guest) Unregistered guest Posted From: 70.49.236.88 |
hey guys, i am a 9th grader and i have built a powerful coil-gun, to the contrary of what you have said above i use a flash camera capacitor which i left attahed to the circut. the capacitor is only 330V and 800uF, with another capacitor wired in paralel from another camera. it can piece a few sheets of paper and still have power to fly. I disagree with general antilles in particular because his statement is almost the exact design of mine and mune is very powerful for the matirials i have used. I can be contacted at angeloposteraro@gmail.com | ||
| mnado (Mnado) Senior Member Username: Mnado Post Number: 163 Registered: 12-2005 |
You can make one by using a solenoid, its a mechanism used in car locks. You can make one by making a series of electromagnets wound around a coil, it should be separated to make a momentum. Make a switch that will quickly change the connections of the battery to the coil attracting the iron thing inside the tube. | ||
| Michael R (Unregistered Guest) Unregistered guest Posted From: 71.210.113.42 |
I just made a coil gun out of a flash circuit with a 330v 80uf capacitor....just rig the coil from one end of the flash tube to the part you disconnected the flash tube from and you get a 1000-4000 volt spurt of force that can make this little metal thing I have break through 1 piece of paper and still travel several feet. So just a very small charge from a 1.5v battery to the 330v and then stepped up to 1000-4000volts is enough to make a cool little toy. Some people think a battery isnt enough....but if just a small flash circuit charge can do what it did then it must be good enough. | ||
| Simon Quellen Field (Sfield) Senior Member Username: Sfield Post Number: 1078 Registered: 12-2004 |
Post some photos. | ||
| jason rucks (Rucj0131) Junior Member Username: Rucj0131 Post Number: 7 Registered: 10-2005 |
Could someone PLEASE respond to my posts?(the ones up seven posts from this one.)Can I also ask if someone can respond to my post on "Combine modifications!" ? They were all posted at least two months ago. | ||
| MadScientist (Madscientist) Senior Member Username: Madscientist Post Number: 165 Registered: 4-2005 |
okie, A, the arrows usually point to the negative terminal of the capacitor. B, 3 4700uF caps can't store a whole lot of energy (not enough to make much of a coil gun anyway). C: as far as how to connect the caps, this all depends on what you're after. if you intend to use lower voltages, with a higher current spike, connect them in parallel, if you are to be using higher voltages with less current, series. Either way they store the same amount of energy, but series will be more efficient for this particular device, again depending on the coil. D, the 35V indicated on the capacitor is its maximum safe working voltage, and indicates the highest potential that you should charge it up to. The closer you get to this value for each capacitor, the better, as you will maximize the amount of energy that gets stored. E, the positive/negative relationship depends on the parallel/series config. Don't get discouraged by this, but you probably should at the very least do some more research before you toy with the a coil gun so that you understand more about the dynamics of it. A coil gun capable of launching much of anything more than a 'nudge' needs some serious energy, and is quite dangerous to play with, particularly if you are unfamiliar with the quantities involved. A good place I found to start might just be www.oz.net/~coilgun/home.htm | ||
| jason rucks (Rucj0131) Junior Member Username: Rucj0131 Post Number: 8 Registered: 10-2005 |
Thanks! I already built one using a flash circut out of a camera, and got it "SHOCKED" into me to be careful near circuts that could hurt me. | ||
| jason rucks (Rucj0131) Junior Member Username: Rucj0131 Post Number: 9 Registered: 10-2005 |
I got another capacitor, it says(as on label): 330v 800uf negative black PHOTO Then it repeats this sequence. It has-I should have mentioned earlier that this is a cap from a photo flash device, connected to the top of cameras-Anyway, it has two red wires and a blue one, of the red ones, one went to the xenon flashbulb, and the others went to the circut boards.I think the blue one is negative, but I wanted to make sure because bad things happen when + and - get switched - Right? Also, can I connect this in series or paralell to another cap of same v., but diff. uf? P.S. The "other cap" I mentioned was part of a flash circut out of a camera, which I already made into a successfull coilgun, I just wanted to up the voltage or ... Amperes,.. isn't it?(whichever is more efficient/easier.) Thanks, Jason | ||
| jason rucks (Rucj0131) Junior Member Username: Rucj0131 Post Number: 10 Registered: 10-2005 |
I don't sound too sure of myself, Do I? | ||
| I. Dimov (Overrider) Senior Member Username: Overrider Post Number: 106 Registered: 12-2005 |
I was wondering if three 470 uf caps in parelel and a 850k pot in series with them (RC Circuit), would work as a coilgun (requiring less than three 9v batteries). Also do I need bleeder resistors for the caps? | ||
| Simon Quellen Field (Sfield) Senior Member Username: Sfield Post Number: 1499 Registered: 12-2004 |
Several folks have pointed out that this site doesn't have a coil gun, and the expert is here "http://www.oz.net/~coilgun/home.htm". That said, you want an LC circuit, not an RC circuit. The L will be the coil. | ||
| I. Dimov (Overrider) Senior Member Username: Overrider Post Number: 107 Registered: 12-2005 |
Isn't an rc circuit resistor and capacitor (pot and cap in this case)? | ||
| Simon Quellen Field (Sfield) Senior Member Username: Sfield Post Number: 1500 Registered: 12-2004 |
Yes, it is. But you don't want an RC circuit. You want an LC circuit (a coil and a capacitor). | ||
| Justin (Commander_bob) Member Username: Commander_bob Post Number: 13 Registered: 10-2006 |
I made a simple and fairly safe coil gun with a disposible camera and some magnet wire. All I did was remove the flash, take a straw, wrap A LOT of gage 22 magnet wire around, connect the coil to one of the flash leads, charge the capaciter, and connect the ofter end of the coil to the other end. Bam, you get a small spark and a 1 1/2 nail shaft about 30ft. This is a great demo. I have gotten the nail to hit the celling. It only cost $10 ($5 camera and $5 magnet wire, I have A LOT left). | ||
| jon haberkorn (Jon_notgay) New member Username: Jon_notgay Post Number: 1 Registered: 11-2008 |
i have made a coil gun that you wind up to charge it manegd to explode my coil (old soliniod) and shoot therw a can. if you want more detial you can e-mail me at jon_notgay@yahoo.com |
