magnet gravity

Couldn't, with well position magnets, create an orbit around a central magnet? Almost like perpetual motion? I've been playing around with magnets lately, and I've gotten magnets to do 2 full revolutions around other magnets before coliding. Is it possible?

Posted by guyfrom7up 10 years ago

Magnetic Table Holds It All Together

All that space under your dining room table has been going to waste... until now! Install neodymium magnets all over the place and you have an interesting concept. I'd be in constant fear of knocking a cup and saucer onto the floor with my knee, but it's not like anyone's really gonna make this and use it. Right? linkvia Gizmodo

Posted by fungus amungus 10 years ago

Newb questions - magnets behind mirror!

Hi! I'm incredibly new here and already in way over my head! Hope this is the best place to ask this. I wanted to create a mirror that is magnetic to hold tweezers, nail clippers, etc. -  lots of little metal cosmetic bits that get lost around my home. I can't attach magnets to the items themselves because they are too small - would it be feasible to glue some rare earth magnets behind the mirror? Or will I just get a giant chunk of mirror embedded in my face? :( I'm trying to spruce my home up on the cheap and keep the small space organized. I have a sampler pack of rare earth magnets from lee valley and some framed mirrors already. If this is feasible could anyone tell me how far apart I should be spacing the magnets?  I feel like such newb! I guess I am one. But anyway, I humbly beg at your feet! Please help! Thanks folks!

Posted by Stasiasilver 5 years ago

Magnetic Field for hollow core?

I am working on a project in which I have to control a small setup at the end of a motor shaft using an electromagnet. The electromagnet needs to be around the shaft inbetween the setup and the motor. So I have used a metallic ferromagnetic spool(image attached) and wound 32 gauge wire on it to make it an electromagnet and put the shaft through it. Since this core made out of spool is hollow, I'm not sure how the magnetic field will behave. I tried powering up the one I made and it' seems to be both attracting and repelling a magnet's pole (edges attract while centre somewhat repels). Anyone got any idea about this?

Posted by Antzy Carmasaic 5 years ago

Touch sensor connected to magnetic lock

Hi everybody, I would like to know if anyone can help me for this idea. Indeed, I would like to create a touch sensor which will be connected to a magnet system. To be more accurate, the idea involve the same process as a touch screen phone where one needs to do a pattern with 4 touch sensitive cases . The pattern would create and electrical impulse, which would unlock the box by detaching the magnet. So in a nutshell I will need a touch sensors pattern programing that would send an electrical impulse to detached the 2 magnets. I need this system so it could help me for my 1st creation. It needs to be very small to fit in a box of altoids candy for example. As I said, as a 1st creation I am completely lost for all theses "programmation" skills required. Thank you for your help. Beniver

Posted by Beniver 3 years ago

BIG electro magnet uses?

So i have been taking apart alot of electronics, looking for sweet pieces for my arc reactor im building and today i decided to take apart an old Goulds jet Pump.  Inside i was please to find all this coperwire. I just LOVE the look of this thing, and i know people always build coil guns and all that cool weapon stuff. There has GOT to be a cool use for this, other then giant paperweight.   Any suggestions.  Here is a photo of it.  That copper goes all the way through it. and looks the same on the other side.

Posted by valmont325 6 years ago

Questions about Magnets

Can an electro magnet have more gauss than a neodymium of the same size?  I was just thinking about robots and advanced prosthetics. One issue with them is they require rather bulky motors to get the lifting and holding capacity we often require. So if power wasn't an issue and you could make a small elecro magnet that has more gauss/a stronger magnetic field than a neodymium magnet. Than we could make strong and smaller motors.  Just a thought. Discuss!

Posted by mpilchfamily 4 years ago

magnet powered LED

Ok i remember seeing something, or maby its just a thought in the back of my head. but is there a way to make a led light up when you move a magnet by it or something like that?

Posted by yuckzee 9 years ago

Q: how to remove/salvage fixed magnets from dead HDDs?

Does anyone have any tips for removing the powerful magnets from dead hard drives? I have the hardest time prying them off the metal part they're mounted on once I've disassembled the drive. I've shattered one or two trying to drive a wedge under one with a hammer. Thanks!

Posted by gionwhorphin 7 years ago

Quantum Levitation

Wow, just in time for The Mad Science Fair- an awesome magnetic levitation set-up. The Superconductivity Group at Tel Aviv University have been working on thin-films of superconductive materials and have found effects.  The thin films will apparently have a few defects, resulting in very specific areas where the magnetic field permeates.  This rigidly constrains the composite, allowing even "up-side down" levitation! (locked in space, beneath a magnet.)  Would be so awesome to play around with but apparently the deposition of the superconductive film is a real challenge, not to mention the sapphire substrate. A forum post at HI Capacity had these links, probably after a member saw Gizmodo's article "What the Hell Magnets? Why Are You So Amazing?" Via youtube: ASTCvideos Quantum Levitation QuantumLevitation

Posted by CrLz 6 years ago

how far can an electromagnetic field reach?

For my project I need to know how far electromagnetic fields can reach. I am guessing its related to power and materials, but perhaps there is some kind of rough formula for calculating potential reach? By reach, I mean, how far can the magnetic field reach and attract (move) something, like metal fillings. Also, is there anyway to know how quickly a magnetic field can move something. In other words what speed will metal fillings move at when the electromagnet is switched on? Thanks all, Joel (the snow athlete)

Posted by snow athlete 9 years ago

Methods for winding coils

When I read up on the coils used in power generation, I found that the wire used is a type of magnet copper wire, and I bought 1600 feet of it on ebay. My only problem now is winding the coil. I figure I can do something like wrap it a few hundred times around a pole thats slightly larger than the rare earth disc magnets I got. Anyone have any suggestions? Btw, most of my information is adapted from normal rotating wind power generators.

Posted by fafnir665 10 years ago

Wanted: Car Sensing Camera

Hello, I'm looking to build a solar powered camera that detects cars moving past and takes a photo. I've been trialing an off the shelf model that relies on software to detect motion but it does not perform well when the cars are travelling over 15km/h. For this reason I'd like to try and develop a camera that senses the magnetic properties of a car (like traffic lights). I'm open to suggestions but here's how I picture it working: Magnetometer detects car > Micro controller > Camera > Micro controller > 3G/4G antenna > Internet. The system would need to be powered by a battery which is charged by a solar panel. Send me an email and we can chat on how to tackle the project. I work for an environmental consultancy so we can provide you with proof of an internship. Thanks.

Posted by TomF127 1 year ago

Help with electromagnet

I have made an attempt to make an electromagnet.I got a 10 inch iron rod with insulated copper wire wrapped around (see image)I didnt have enough wire for the whole rod, so the wire is in two seperate sectionsI tried a AA 1.5v battery, two AA 1.5v, a 9v, two 9v and a big 6v plugged in both ways (negative, positive).None seem to work.I thought it may be the two sections connected together, so i tried all the above batteries again on only one section, and it still didnt work.Can anyone help me out here ?

Posted by oxidase 9 years ago

Electro Magnets

If an electro magnet is suspending something in an vacuum environment, will it act as a medium? (Will sound waves be able to pass through the magnetic field?) Thanks

Posted by Weissensteinburg 11 years ago

Energy wheel

This Idea is based on Magnetic Repulsion and Kinetic force. According to diagram there will be a  Wheel and a magnet(1) will be attached with this wheel. There will be a balance system(seesaw system) and two magnets(2no.magnet and 3no. magnet) will be attached with this balance system . when 1 magnet will repel 2 no.magnet then the 2 no.magnet will move upward and due to this movement the 3 no. magnet will come down and will work to repel 1 no. magnet and wheel will start to rotate. when 1 no. magnet will again repel 2 no.magnet after a rotation then the 3 no. magnet will again work to repel the 1 no.magnet. In this way the wheel will rotate again and again.The magnetic strength of 1 no. magnet will be high than 2 no. and magnetic strength of 3 no. magnet will be high than 1 no. magnet. I want to develop this technology.

Posted by vikram_gupta11 2 years ago

Magnetics software for designing magnet coils?

Dear Instructables, I need to design magnetic coils for a mattress that would emit a uniform magnetic field. Does anyone know of a basic program that would plot flux density over the coils? Preferably free! Thanks! Mike

Posted by Cburg1 6 years ago

magnetic ball bearings

How do  magnetize my own ball bearings for making magnetized Fullerine geometry? Sorry cant find the right word for it, i'm obviously scientificaly challenged.

Posted by craftyv 7 years ago

Fridge Magnet Challenge Results

Results of the Fridge Magnet Challenge are up here!

Posted by canida 11 years ago

Electromagnet using permanent magnets

Hi All, I'm attempting to make a very small strong electromagnet using permanent rare earth magnets. I want to boost the magnetic field and increase the magnetic force. The magnets are 10mm in length by 5mm in radius. I have 0.4mm2 enamelled solenoid wire for the winding. My questions are, Is it possible to increase the force of a permenent  magnet? Will the induced flux into the magnet compile the force or will the EMF have to be greater to see an effect? Will paralleling two windings make the EMF stronger? As the magnets are small I have limited room to wrap windings so is there a more effective method? Any help would be great!

Posted by JimmyM5 3 years ago

Calculate magnet repulsive force?

I'm looking to make a "floating" model by insetting NdFeB rare-earth magnets with same poles facing so they repel. Now, magnet selling places specify the "pull" a magnet might have, say 1.2kg. What I would like to know is if the repel is equal in magnitude as the pull if two similar magnets are placed with same poles facing, is the force exerted 1.2kg and so I could float 1.2kg of stuff? Also, does stacking magnets double the attractive or repelling force, i.e. do two 1.2kg magnets stuck together lift 2.4kg of stuff, negating the small difference in distance of one magnet from the object? Is there a way to calculate the distance between two opposing magnets with a force applied. Does it follow the inverse cube rule? And if the stacking does work, do I also need an equal number of magnets on the other side for repelling, i.e. a stack of two 1.2kg magnets repels 2.4kg with one 1.2kg on the other side, or not? Does the magnet on the other side have to be the same force? Lots of questions but hoping someone can shed some light on this as I've not been able to find anything about it :-(

Posted by chiok 9 years ago

Can a magnetic propulsion system be achieved

Earnshaw's theorem states that a collection of point charges cannot be maintained in a stable stationary equilibrium configuration solely by the electrostatic interaction of the charges. This was first proven by British mathematician Samuel Earnshaw in 1842. It is usually referenced to magnetic fields, but originally applied to electrostatic fields. It applies to the classical inverse-square law forces (electric and gravitational) and also to the magnetic forces of permanent magnets and paramagnetic materials or any combination, (but not diamagnetic materials). Earnshaw's theorem has no exceptions for unmoving permanent ferro-magnets. However, moving ferromagnets, certain electromagnetic systems, pseudo-levitation and diamagnetic materials are areas to which Earnshaw's theorem doesn't apply and thus can seem to be exceptions, though in fact these exploit the constraints of the theorem.  Can we develop a safer cleaner transportation method that involves electro magnets that can propel cars using the city's grid to adjust the power on the street or road to move cars. similar to  famous movies vehicles like STAR WARS(c) Repulsor Lift(c) technology or The MATRIX(c) Ships OSIRIS?

Posted by daswokster 7 years ago

Magnet strength for DIY VAWT

Hi, does anyone know if it is better to get stronger magnets for a DIY turbine? Is it always better, or only to a certain degree?

Posted by elmejor06 8 years ago

Magnetic Levitation

I need help for a mini-project under a prof. My topic is magnetic levitation and i need the procedure of the experiment. pls help

Posted by shounakghosh18 6 years ago

Need help making a permanent magnet alternator

Hi - I have need of a small electric motor, and came across something called an altermotor.  This is a converted car alternator that requires a permanent magnet rotor assembly, the removal of the diode pack and a controller.  This is also supposed to be good for up to 4HP off 12V.  I've worked out everything but how to make the permanent magnet rotor.  Does anyone know how to do this?  I'd like to do this with high quality neo magnets, preferably with more than 12 bar magnets.  A car's alternator is the perfect size for the application, which is to run an air conditioner compressor for an electric car conversion.  A single 12V deep cycle battery would be able to run this allowing me to have air without cutting vehicle range since it would be able to operate off its own power system this way.  I'm not set on using a converted alternator though, if anyone knows a suitable 12V motor about the same size as an alternator that can produce at least 1HP and spin at least 2000RPM.

Posted by Inswitch 6 years ago

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.

Posted by um0123 9 years ago

Is it possible to transfer data via magnetic induction between two coils separated by a steel plate ?

Is it possible to transfer data via magnetic induction between two coils separated by a thin steel plate of 2mm ? Or does the magnetic field gets diminished by the metal plate?

Posted by ZZamorin 2 years ago

Transformer-winding wire

I am going to be hand-wiring up a large lot of transformers. Someone has told me there is an enameled wire (magnet wire) whose coating melts when you dip it in solder (also tinning the copper tip at the same time). What is this type of wire called? I am having a hard time searching for it. Thanks!

Posted by samurai1200 9 years ago

Can you build a pmdc motor that can pull a skateboard prety fast on 240W?

I'm trying to build a pmdc motor (perminent magnet motor) based on this video: But I want to make it in a much biger scale and instead of using a ceramic magnet I wan to use 2 big industrial neodymium magnets instead they will pull up to 200 pounds. I want this homemade built motor to pull a scooter like vehicle (skateboard if you will). It will be powerd by 2 12V 10A batteries wich doing the math should get me: 12V+12V=24V 10A+10A=20A 24Vx20A=240W The coils will be made from 1.5mm thick copper wire. Based on what I've said do you think the motor could be powerful enough to pull this scooter with someone standing on it at about 20 to 25mph? can this be done?

Posted by NoahW7 3 years ago

ElectroMagnetic Pulse Generator

Does anyone know how to make an electromagnetic pulse generator and im not talking about an EMP

Posted by cvm726 10 years ago

Five days left to get a Magnetapult!

This post is for the Magnetapult, described in this instructable. If you don't have a laser cutter, or the patience to tweak the pattern for yours, you have a few days left to back the Kickstarter project and get a Magnetapult of your own!  The kickstarter project page is at: There's three models, a regular one (extremely tweaked from the design posted in the instructable, with harder to find parts), an aluminum version, and a mini version.  Current pictures/rendering below. (Not the final design, but close.) Thanks for your time!

Posted by jfehr67 6 years ago

Mini Size of "No Coriander" Stamp Magnet Keychain (Picture just added)

I found this D.I.Y mini stamp of "No Coriander" on web search in Chinese and it immediately caught my eye and I really want to make one for myself. This is a REAL useful small craft, but sadly, the maker didn't shows how to make it. Fellow friends, I know this is just a small easy craft for the experts, but I have no experience on this kind of D.I.Y. I'm here to ask for help on this D.I.Y. I would appreciate it if anyone could teach me on the steps and what materials to be prepared. Thanks in advance.

Posted by LiviaJ1 7 months ago

6 Farad Coilgun

I recently came across 4 1.5Farad capacitors and made them into a capacitor bank, but I just want to get a general idea what would happen if I made a 6 farad coilgun...would it go through walls or anything?

Posted by adrewmc 10 years ago

Electro magnetic Gloves

So, we've seen magnetic gloves..but we don't always want the magnets. So, instead of taking off the glove, why not make an electro magnetic glove? Do you guys like the idea? Should I pursue it? Make an instructable on it?

Posted by Weissensteinburg 11 years ago

What should I do with these?

I've had these speakers for a while and I can't think of anything to do with them. They are about 11 1/2 inches in diameter and I have two of them. Does anyone have any ideas I could use? Headphones for grandma? :)

Posted by Rockerx 10 years ago

Arduino magnetic card reader with tape head

How can i make a arduino magnetic card reader with only a bare tape head without external circuitry 

Posted by atharva12 3 years ago

Magnet Sculpture Kit - 20% Discount for Instructables Community

We've worked out a deal with the fine people at the Maker Shed for you to receive a 20% discount on the Magnet Sculpture Kit until December 19. We'll be sharing this deal in the upcoming newsletter, but you can get it now. After ordering, use this coupon code: MAGNETICSee the Instructable here: Make a Magnet SculptureMagnetic Sculpture kit from Collin Cunningham on Vimeo.

Posted by ewilhelm 9 years ago

magnetic bed

Since our cells are electrically based, I thought I would try sleeping on a magnetic bed, any plans out there?

Posted by katesisco 11 years ago

Magnetic strip card reader/writer

Hey guys I am looking for a way to make a magnetic card reader/ writer. any one knows where i could find a how to for this. thanks a lot

Posted by DELETED_kclv1988 10 years ago

Tips and Hints

This is my invention for the day.  Use of magnetic tool holders is a very old, but handy way to organize tools.  My contribution to Magnetic Tool Holders is to use small, strong magnets (12 mm diameter) attached to a metal bar or in the photo, to my card table edge.  That in itself is still not very significant. However HOW the tools are hung from the magnets is significant. The problem:  If I put the magnets vertically and hang the tools vertically, the surface area of the magnet is such that often the attraction between the tool and the magnet causes the magnet to stay with the tool instead of with the table.  A magnet sticking to the tool, can be very annoying. The solution:  Placing the magnets horizontally--at the bottom--AND hanging the tools by their tips allows for very easy detachment and attachment.  The magnetic force is strong enough to hold some very heavy tools, like the pliers or long nose pliers without any difficulty.  The tools are easily removed and easily replaced.  This would also apply to any magnetic strip.   The key thought of the day: Hang tools from magnetic tool holders by their tips. Of course, another solution is to glue the magnets to the supporting bar--wood or metal--and clamp the supporting bar to the table.  That works as well, but is more permanent and is a little more work.  Also, if the magnets are allowed to attach by their full surface area to the tools, the tools are hard to remove.  

Posted by stannickel 9 months ago

WANTED: Free Large/Medium-Sized Neodymium Magnets

Hello I am looking for large or medium-sized neodymium magnets that you no longer want or need. Magnets of more than 1in are preferred but magnets of a slightly smaller size are ok. The preferred shape(s) of the magnets is/are cube, bar, sphere, or cylinder but any shape is perfectly fine. Thank you very much for taking the time to look at this post, whether you can provide any magnets or not. Please reply if you can provide any magnets. I am willing to pay shipping if it isn't too high. Thanks again and have a great one. Bye! :) Side note: I am well aware that magnets are relatively cheap online but I need to get a large amount of large to medium-sized neodymium magnets and the price adds up very quickly so please think about giving me some magnets.

Posted by BeekerButts 1 year ago

Tesla's "magnetic wave" communications idea proposed for mine safety

A report in Science Magazine describes a proposal to use Nikola Tesla's magnetic amplitude modulation as a way for trapped miners to communicate with the surface.

Posted by kelseymh 7 years ago

Recycling stuff for cool fridge magnets!

Recyle your old broken hard drives. Take them apart and scrounge the powerful magnets out. They make great ways to attach anything to your fridge or metal surface. See my 64 Corvette Stingray Fridge Magnet Instructable. It has flashing tailights! As ever -TRIUMPHMAN.

Posted by triumphman 10 years ago

Magnets and Microwaves

I'm planning on setting up a kind of utility rack in the kitchen, and the top of the microwave is the most convenient location. I was planning on using neo magnets to hold it all in place, but does anyone have any idea if they'll affect the magnetron?

Posted by yontally 10 years ago

Magnetic spec

I was wondering how big a cylinderical grade N42 NIB magnet i would need to pull a copper weight of 20 grams from 3inches? I dont know how to calculate so... If you could, that'd be great

Posted by lifelong-newbie 10 years ago

Magnets in the Microwave, can you do it?

So does anyone know if you can put a magnet in the microwave? Will it cause some nuclear explosion, or rocket me back into time? Or will it just stay on my mug and witness the warming of my beverage?

Posted by Punkergal 10 years ago

Draw Blood with Neodymium Magnets.

I was curious if anyone besides me has drawn blood while playing with Neodymium Magnets?   Fortunately, it wasn't my blood..  On the down side, I'm no longer permitted  to play with powerful magnets when my Girlfriend Comes over.   She forgave me, but Electromagnetism is a Sore subject around here.

Posted by John_the_Builder 4 years ago

Magnetic Rotor How does this device work? Has it ever been on instructables or anything like it? How would I go about mounting the magnets on the rotor? What sort of spring would I need for the magnet mounted to the vertical shaft that slides up and down? In short I want to know every little detail about building it before I begin so I don't go buying a lot of unecessary stuff and waste money.

Posted by merlin280 5 years ago

Magnet Wire

Cutting open transformers (you might call it an adapter, or charger) yields a good quantity of re-usable magnet wire. Motors don't seem to be a very good source, since the windings on those seem to be saturated in varnish to glue em together. Apparently, vibration is more of an issue in the motors, so they make the windings solid. This might be different in little hobby motors. Dunno.

Posted by Toga_Dan 4 years ago