| Author | Message | ||
     Ryan Somebody |
With all this talk about Magnetic Accelerators, do you think it would be possible to build a Magnetic Decelerator? By this I mean a device using an electromagnet solenoid to stop a ferromagnetic projectile by letting the electromagnet do its work- the opposite of the coilgun (where switching circuits are used).  I'm curious if a series of coils around a pipe could be used to stop a ball bearing from the gauss rifle ( 1 foot version ). I have no clue how much electricity this would require (should I use higher voltage or higher amperage?) and was just wondering if it would be at least partially efficient. I would like to use a device such as this to at least slow a projectile of considerable velocity enough to stop it with foam (so I won't harm it) but for the most part I'm just curious. In case you are wondering I came up with this idea from trying to build a coilgun and realizing how hard it was to pull out the bolt (projectile) while the coil was energized. Thanks for the help and I really like this forum software. Keep up the good work! | ||
| Simon Quellen Field (Sfield) |
Magnetic decellerators are often used in amusement parks to slow down and stop roller coasters and vertical drop rides. They are considered pretty safe, since they consist only of strong permanent magnets and copper plates. When the plates go past the magnets, strong eddy currents are formed which oppose the magnets. I expect a string of permanent magnets under a track that the ball was travelling on would bring it to a stop quickly. A long solenoid as in your picture would also work, but you would have to be careful that the energy of the projectile (which is turned into current in the coil) does not blow out the switching transistor you used to turn on the coil in the first place. | ||
| Ryan Somebody |
What causes the energy of the projectile to be turned into current in the coil? I know Faraday's Principle but I thought that would only work with magnets. I tried winding a tightly wound coil around a PVC pipe and when I pushed my neodymium magnet in and out I got peaks at over 20 volts (although a very small amount of amps). Is a ferromagnetic material nearly as affective? Coils wound around a pipe and linked up in series could produce huge amounts of voltage. | ||
| Simon Quellen Field (Sfield) |
The coil is a magnet, because there is current running through it. As a steel object approaches a magnet, the magnetic field moves so as to go through the steel in preference to going through the air. A moving magnetic field will induce a current in a nearby coil. You could do the same thing without putting current through the coil. Just put a strong magnet nearby, to provide the magnetic field. Now move a ferromagnetic object near the coil and the permanent magnet, and you will generate current in the coil. | ||
| Sheepe |
Now, On the same idea, could you generate a field capible of stopping or slowing a projectile, irrelivant of which direction or angle it comes from? (With the field generator always facing in one direction) Sincerly, -Sheepe | ||
| Simon Quellen Field (Sfield) |
How about a tub of molasses? I can't think of a design off the top of my head that wouldn't have something in the way of the projectile at some particular angle. If we limit the projectile to travelling in a single plane, then a copper sheet above and below would stop a magnet. Add some magnets to the copper sheet, and you could stop a steel projectile. For a lead projectile, use the molasses. | ||
| Sheepe |
Thanks I feel very enlightened Sincerestly enlightened -Sheepe | ||
| Anonymous |
A coilgun? What is that? How does it work? How do you make it? | ||
| Simon Quellen Field (Sfield) |
Type "coilgun" into Google, and you will find almost 3,000 sites that show you how to make one. | ||
| Anonymous |
Sorry Simon, Actually you will find about 3 sites. 3,000 sites are composed of links, broken links, and most importantly the nearly verbatumlly copied Open Directories. | ||
| Simon Quellen Field (Sfield) |
One, two, three, four, five, six, seven, eight, nine, ten, eleven, twelve, thirteen, fourteen, fifteen, sixteen, seventeen, eighteen, nineteen, twenty, twenty-one, twenty-two, twenty-three, twenty-four, twenty-five, twenty-six, twenty-seven, twenty-eight, twenty-nine, thirty. You're off by an order of magnitude, and I haven't even gone past the first 50 sites that Google found for the query "coil gun". I don't know what search engine you were using, but Google shows the best 1,000 sites out of an estimated 337,000 sites that fit the query. Not one of the links I tried was broken. | ||
| Anonymous |
Ok, increase the number at 3 to 6, of which, about 5 sites actually have content that is different from the remaining little-to-no content sites. These numbers are part of the list that have no content: 7, 8, 11, 12, 13, 14, 15 broken, 16 based on phantacy games, 22, 23 see #24, 24 just a repeat of all the numbers-great many of posting but little physically built units, 25 an image or two, 27 a purely retoric article, 29, 30 1000 - 30 is just repeated in the form of the Open Directory Project. Open Directory Project covers majority of 337,000 | ||
| lysdexia Unregistered guest |
Are you French? from 3 to 6 fantasy numbers— greay many postings few rhetorical | ||
| lysdexia Unregistered guest |
greay -> great | ||
| Anonymous |
---------Remove---------- Are you French, Japanese, Chinese, Italian, German, Vietnamese, or could I be making assumptions, true or false, that aid not and ought to be removed? from 3 to 6 fantasy numbers— greay many postings few rhetorical greay -> great ---------Remove---------- Slight of stifling: Is your goal to steer attention away from the importance of this thread? Magnetic acceleration/deceleration, the sources of said, my disagreement that the antecedent is in plentiful, those and any other non "lysdexia" tangential replies (including the presently read) belong here. antecedent-> said said -> magnetic acceleration/deceleration I just noticed something. Not one, not even one response written concerning my disagreement of content sites. I must have struck a nerve. In place of concurrence, what returned was the evocation of the "lysdexia" from within. Being the benevolent person I am, wishing to see you happy, I will tack on a little extra for you. I have no doubts of the satisfaction you shall gain when with great haste your nickpickyness rushes in and has its fun. I cleened the table. I whent to the store. I rood the bike. I waysted space. | ||
| Simon Quellen Field (sfield) New member Username: sfield Post Number: 56 Registered: 12-2004 |
Ok, children, let's not bicker ;-) Someone asked what a coilgun was. I believe that they can get their answer by doing a simple Google search. It does not take 3,000 sites, just one, to answer the question. Likewise, a single site that has the directions for making one will do. I have already poked fun at lysdexia's penchant for correcting spelling on two other occasions. Don't let him bother you, correcting spelling is just his hobby. Personally, I like being able to tell how much thought and effort went into a posting, and how much the person cares about their appearance in print. But I answer questions from school kids. I don't get a lot of literary geniuses here, despite what some of them think. ;-) I really like the people who take the time to write in these pages. The ones I like best are the ones who ask questions that are useful to others, or that answer questions in helpful ways. My own spelling and grammar are quite atrocious. But I have the ability to edit what I say when I find out I have done something silly. For the rest of the correspondents here, they can type their messages into a word processor or email client to get their spelling checked, and then copy the text into the web page. But cut them all some slack -- especially if they have a real question that needs answering, or have some good information to give. | ||
| lysdexia Unregistered guest |
nitpickiness I have experience talking to various ethnic groups, and noticing their specific English mistakes. It was a warranted assumption. Whatever mistakes I point out are beside my factual and ideological contributions. I'm not a he! You think a lysdexia or an Autymn is a he, and a someone is a they? Get your eyes checked. | ||
| Anonymous |
------------- nitpickiness I have experience talking to various ethnic groups, and noticing their specific English mistakes. It was a warranted assumption. Whatever mistakes I point out are beside my factual and ideological contributions. I'm not a he! You think a lysdexia or an Autymn is a he, and a someone is a they? Get your eyes checked. -------------------- Random without a cause. Still did not answer my question. That alone should have convinced me that "she" is a she. | ||
| lysdexia Unregistered guest |
The question was weak and misgrounded. Let the topics steer themselves. | ||
| Anonymous |
Still did not answer my question. Here yee, here yee, all within the sound of my voice gather around and be given a great pause as the inexorable unregistered guest a.k.a. "dyslexia" explains how my question was weak. 5, 10, 20, no not even 50 pounds fades its strength. Soft, hard, viscous, or the likeness of cotton candy, which I say again which form of the nearly infinite number of inbetweens lying within the extremities of diamond and air does my question take? Ha ha ha.... now its clear that topics of night may spand to topics of day. Topics of North if so inclinded to do so be encouraged to reveal their little arms as they spin the compass and travel into the direction called Topics of South. Oh but wait, the words written are not of free will, so how can this be? "Themselves", are by design, the direct result of applied volition and myopic will. Only the poster does the steering, not the monitor, the keyboard, or the seat in which you sit. Weakness is letting an inanimate concatination of alpha-numeric characters do the driving. To sooth our, I, the gathered, and also those outside the sound of my voice, burning anticipation, to rectify our fluttering respiration, let us all make a slow and soft synchronized simple chant, one to ficilitate the cessation of our grand palpitation Steer attention away..... Steer it away.... Softer Steer attention away........ Steer it away............... Slower Steer attention away............. Steer it away.................... Shhhhh once more now Steerr...........way... Steerr....way.......... | ||
| Simon Quellen Field (sfield) New member Username: sfield Post Number: 147 Registered: 12-2004 |
You asked what a coil gun was. I pointed out that a simple Google search would answer that question. I happened to mention that Google found 3,000+ sites that mentioned the word "coil gun" and you got all excited because most of them were copies of a pretty good Wikipedia article that answered your question. Now you waste a lot of space saying absolutely nothing, except a vague insinuation that someone is steering the conversation away from the question that was already answered long ago. Your whole question was a troll anyway, since you asked what a coil gun was when that term was never mentioned in the thread at all. Happy ego trip. Let's not continue this conversation. | ||
| Anonymous |
The anonymous who asked what a coilgun was is not this anonymous. | ||
| lysdexia Unregistered guest |
concatenation, facilitate Anonymous, do you have a neurological disorder? I said topics, not equipment. Keep your chatter in your head where it belongs. Though in another forum I modified the Gauss rifle into a kind of a coil... | ||
| lysdexia Unregistered guest |
obviate, "pickate" I queried for "equipment" in that prior post to which you responded and as expected found no entries for "equipment". It appears that the neurological disorder you wrote of originates from lysdexia. Again, another random pointless initiation of impertinent replies. You are accustomed to bulky machines doing your breathing and biological functions for you. Now I understand why you would let topics steer themselves. S P E L L E D O U T 4 T H E S L O W A N D I N E P T- P O S T E R S S T E E R T O P I C S WOW! "Though in another forum I modified the Gauss rifle into a kind of a coil..." Did you come a lightyear within here http://www.anothercoilgunsite.com ? No entry found: http://www.m-w.com/cgi-bin/dictionary?book=Dictionary&va=misgrounded http://dictionary.reference.com/search?q=misgrounded | ||
| MadScientist (Madscientist) Advanced Member Username: Madscientist Post Number: 70 Registered: 4-2005 |
Now here's the scariest part of all... It may be a GOOD thing if Google NEVER found a SINGLE hit for 'coil gun' because I would hate to see what is done with the information about one based on what I have just read in this thread! Yowch! |
