### Acoustic Levitation?

I want to know if anyone knows a way to do this at home. Acoustic levitation is a way to levitate objects in space using sound waves. That site gave a very thorough explanation of how it works, but not how to do it. If someone knows how, I'd love to see an instructable.

Topic by ultrauber 11 years ago  |  last reply 2 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

Topic by shounakghosh18 7 years ago  |  last reply 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 some...cool 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

Topic by CrLz 7 years ago  |  last reply 7 years ago

### Electromagnetic and Magnetic Levitation

Hi! I am setting up a levitation system and need to estimate the amount of voltage and current that is needed for a 2" dia. coil to produce 4800 Gauss. I don't have any restrictions/requirements on the core, number of turns, etc as long as it would produce 4800 Gauss with a 2" diameter. How can this be calculated? (I have spent a lot of time googling for such information, but I am pretty confused and didn't find how to calculate this) Thanks!

Topic by J50Nunlimited 9 years ago  |  last reply 9 years ago

Has anyone tried building this electromagnetic floater, and had it working? Because I'm trying to make it, except it doesn't work for me....I don't know whether it's the circuit, or just me. P.S; Are most of the circuits on this website reliable?

Question by .Unknown. 8 years ago  |  last reply 7 years ago

Hello there instuctables, I need your help with a project i am attempting, i am in the process of making a maglev tram and i have a couple questions i need help with? 1. I have a simple circuit for a linear motor that i understand to the most part but i need help with finding an electromagnet to use / make, it needs to run on batteries and obviously the main concern here is weight and stability so the smaller the better but still needs to be strong enough to propel the tram along the track so i suppose my real question is what ammount of winding, resistance and core material would be suitable for whatever voltage i could provide! 2. Next i suppose what way round should i place the magnets, should i place many electromagnets on the rail with sensorsand permanent magnets on the tram, or should i have a powered electromagnet on the tram and permanent magnets on the track? 3. Also what hall sensor should i use to detect the magnetic fields, unipolar switches or ratiometric sensors? 4. And finally control, how would i control the motion of the tram i.e. speed and direction? Id like to thank you all in advance for any help you could provide and i hope my description is accurate enough!! many regards, Scott Photo of simple linear motor circuit (img.1) When the hall sensor (switch) senses a pole of a magnet, it activates the transistor, in turn magnetising the relay and causing the current in the electromagnet (motor) to run one direction, then as the opposite pole is detected the relay de-magnetises and reverses the current thus reversing the pole on the electromagnet! This is designed so that with permanent magnets on the track in an alternating fashion of poles (nsnsns) the tram is either pushed or pulled along the track!

Question by Xmortx114145 6 years ago  |  last reply 6 years ago

### Small animals levitated by sound

If anyone is looking for an advanced cool project, here it is: Acoustic Levitation. Scientists at Northwestern Polytechnical University in Xian have used sound waves to levitate small creatures while they are still alive, without causing them any apparent harm.

Topic by ewilhelm 12 years ago  |  last reply 12 years ago

### How to duplicate this levitation effect?

I saw this video on Facebook which shows a Ouija board themed cake with the planchette hovering aboard the cake surface and spinning.People have asked how this is done, but the maker is not answering.It looks to me like it must be magnetic. I don't really care about cakes, but it would be cool to make something that levitates and even spins like this. A "haunted Ouija board" would be an obvious application fro a haunted house. So, how would you duplicate this effect?

Question by justjimAZ 6 months ago

### Easiest method for magnetic levitation? Answered

I have a ring magnet of about 4 cm diameter and additional magnet pieces. for my science project, i want to suspend one magnet in the air WITH OUT ANY SUPPORT. how can i do it? what are the factors affecting the stability? can anyone tell me the simplest way to perform that? what other shapes of magnet will i need to do that?

Question by allsparkunleashed 6 years ago  |  last reply 6 years ago

### Grounding a magnetic levitation circuit

I need help understanding the circuit attached, from what i understand is that i can power it from a 12V mains adapter. The one i have is 1 amp which i think is enough. But more importantly for the grounds, that i should connect them all up to the ground coming from the 6 pin on the left opamp. As though this ground would act as a central one, with all the other ones connected to it. Is this correct or not, if not then please explain to me how i should ground this circuit. I claim no rights to the content in the link and am using it for my own recreational purposes. http://uzzors2k.4hv.org/projectfiles/magneticlevitator/Magnetic%20Levitator%20circuit.GIF

Topic by o0SLOVAKIA0o 5 years ago  |  last reply 5 years ago

### Magnetic Levitation (without electromagnet above, or spinning top)? Answered

Hey, so I was watching some of these videos about magnetic levitation, and I notices that some levitating globes don't have an electromagnet above the globe. Nor is the globe spinning very fast. This is one of the devices that I have seen, and I would like to know how it works so that I can build it....and maybe make an instructable along the way. Also, SimerLab has the levitation down pretty well. Anyone have any ideas? Thanks! Sam P.S. Found another good website here that has one taken apart (it was a Levitron AG). And this website has a kinda breakdown on how one might work, but it definitly isn't specific enought o build one.

Question by samr37l 8 years ago  |  last reply 7 years ago

### Magnetic Levitation Sculpture for sale on kickstarter!

You may have seen my award winning Magnetic Levitation Sculpture instructables project. (Won the Magnetic Challenge contest, and hoping to win the Epilog laser challenge!) Kits are now up on Kickstarter if anyone wants to get one.  There's many models to choose from, depending on how much you want to back my project, including a limited edition acrylic version.  They will be available for sale after the kickstarter project is finished funding (for an additional \$10 plus shipping and handling) if you'd rather wait! Thanks for your time!   John

Topic by jfehr67 7 years ago  |  last reply 7 years ago

### How to make a large electromagnetic levitation device

I found this instructable on making the magnetic air bonsai plant but id like to make one that lifts much larger objects maybe up to 500lbs... I understand how it works in principal but i don't have the knowhow in order to go out and purchase the right components. Here is the link to the first one https://www.instructables.com/id/Arduino-Air-Bonsai-Levitation/

Question by SDRR 6 months ago

### any idea of a levitating box over magnet instead of magnet floating over box?

The levitator machines cant fly themself yet but what if they do? it would be possible to make a kind of a car if you use a field with alot of strong magnets right? I mean this: +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+- -+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+- -+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ another 4 electromagnets could be used as a sensor that detects thepolarity of each levitating box (if used 4 boxes) and a microcontroller just switches the magnets on + or - to move the object or car forward...

Question by blackdogg 9 years ago  |  last reply 9 years ago

### Any ideas on materials/ setup for levitating shoes? All serious responses greatly appreciated.?

I want to make levitating shoes with an old pair I have lying around. i know magnets and electromagnetic fields will not work, so I has thinking of fan propulsion systems like in the hover crafts you can buy. Even getting an inch off the ground would be fantastic. I was wondering what your guys' opinions would be on materials and setup, or if you have done the project successfully what you did and maybe your layout. All help greatly appreciated. Thanks!

Question by adam72 7 years ago  |  last reply 4 years ago

### Magnetic Levetation? A Magnet Levitating between two Bismuth plates?

I am trying to make a magnet levitate between two bismuth plates that i made (picture 3,4,5 and 6). As you can see they are round discs about 7mm (millimeters) thick and 110 mm or 11cm (centimeters) in diameter. I bought two magnets; -the one I am trying to make levitate is 30mm (millimeters) in diameter, 10mm thick, and 22kg (kilograms) strong... -the other that is on top, the one that is pulling the magnet up is 30mm in diameter, 15mm thick and 23kg strong I put my two plates of bismuth so that there is about 25mm of space between them... Than I put in the 30mm x 10mm magnet that I want to levitate inside. The other magnet is located above the setup. I very slowly, ever so carefully start to lower the magnet. The magnet between the two bismuth plates starts to shake and at one point hits the top bismuth plate. I can't make it to levitate, either it is on the bottom plate or on the top. I tried to make the space between two bismuth plates smaller and larger, to lower the magnet by a very small amount...it didn't help... PROBLEM: I can't make it levitate, either it is on the bottom bismuth plate or on the top... WHY IS THIS? HOW CAN I FIX IT AND MAKE IT LEVITATE? Thank you for your help! -Stanislav A.K.A. Comodore

Question by comodore 10 years ago  |  last reply 6 years ago

### Anti Gravity Idea...

OK I had this idea. I was online and thought up this idea for an anti gravity machine. This is it: use extremely static negatively charged materials for anti gravity. It could work the same way lightning clouds do. The base of the cloud is negatively charged and the ground become positively charged. Now if the material of the anti gravity "thing" is charged with static electricity, wouldn't it repel the ground? Now I am by far no expert in any of this...I just thought it up. What do you guys think?

Topic by bcarl6 9 years ago  |  last reply 9 years ago

### How to levitate a playing card with your cellphone!

I got about halfway through making one of these before I started questioning its seriousness. Is it a joke? Or, hopefully, is it valid? UPDATE:Don't you just love who gullible some people are? ; ) Anyway, now that I've shared this with everyone, should I delete this topic. I'm not sure how it could benefit anyone else by leaving it up, and I try to clean up my messes.If anyone knows the latter to be true, could you give the scientific explanation for why a cellphone can levitate a playing card?Looking up how to add a video now. :P Here's the URL in the meantime:http://www.metacafe.com/watch/448034/secret_science_anti_gravity_revealed_homemade Errr...Perhaps I'll make an Instructable on how to not read the entire set of directions in an Instructable on how to make videos. Mmmmm...recursion :P

Topic by carbon 12 years ago  |  last reply 12 years ago

### Can pulse width modulation pins on arduino noticeably affect the strength of an electromagnet? Answered

I am currently designing a project in which two electromagnets cause a small metal object to levitate between them, and am trying to create an interactive interface in which gestures on a multi-touch trackpad cause the object to levitate higher or lower. My question is, is it possible to use an arduino's pulse width modulation to significantly alter the strength of an electromagnet in order to move an object at a noticeably varying distance from the electromagnet?

Question by ALogan97 6 years ago  |  last reply 6 years ago

### I want to make a levitating coffee table (or some kind of large object) using electromagnets. I need help with a design.

i want to make so that i can adjust the hight by changing how much electricity is being outputted. could someone help? this is for a science fair project sooooo yeah.

Question by HANKS965 9 years ago  |  last reply 9 years ago

Hi I'm a subscribed user of instructables, and I've just finished my 1st instructable. My work is about magnetic levitation. I'm able to make a magnetic top levitate over a magnetic base. My idea started from a commercial toy called "levitron", and my instructable is a full detailed receipe to build a similar toy, using cheap or second hand objects, by yourself. My last concern is about copyright. I got my result on my own after a long time and a lot of research, and it's easy to understand that the object realized is made also with scraps, but anyway I'm worried if I can or I can't publish that. Can you help me Regards David Zuliani

Question by zuliani71 8 years ago  |  last reply 8 years ago

### Electromagnetic levitation via a grid of magnetic "pixels"? Let me clarify...

An idea popped into my head a few months ago whiles reading about superconductors and how they create a magnetic "mirror image" of the magnet levitating above them. I imagined a grid of small electromagnets arranged similar to the pixels of a computer screen, each one individually controlled by a computer. Some sort of sensing mechanism, of equal resolution to the grid, would detect the magnet's flux at any given point and send that to the software. The computer would model, in real-time, how it must adjust the magnetic grid to compensate for the momentum and weight of the unique magnet floating above the grid. Basically, the software would mirror the magnetic field to allow for perfect stability and even maybe some level of control by offsetting the stability slightly to make the magnet move across the table. So is this even possible? Does it already exist? Do I get a cookie? *Target all weapons on that idea and FIRE! Shoot it down.*

Question by FluxTesla 9 years ago  |  last reply 2 years ago

### How do they make this?

Since we are into tesla http://www.flyte.se/ Can you theorize how they do this ? Maybe there is a motor inside...

Question by iceng 3 years ago  |  last reply 3 years ago

### Does Instructables have a policy or consensus on plagiarism?

I was going through all (yes, all) of the I'bles tagged in the Science category (to help populate the Physics Group) and ran across the following:Build Levitation Device. published by ermak777 on 12 Feb 2008.Build Levitation Device. published by kinofanat on 14 May 2008.The duplication is quite astonishing, right down to the typos in the description of the video. I've flagged the later edition as "Inappropriate", to help staff find it.

Topic by kelseymh 10 years ago  |  last reply 10 years ago

### Real-life Back to the Future 2 hoverboard

French artist Nils Guadagnin has built his very own hoverboard based on the hoverboards in Back to the Future II. It's pink, it's a board, and it actually does hover when placed on its platform. Integrated into the board and the plinth is an electromagnetic system which levitates the board. A laser system stabilises the object in the air. The board is hovering with the help of two CLM-1+ levitation modules made by Crealev. Hoverboard Project via geekologie

Topic by fungus amungus 8 years ago  |  last reply 8 years ago

### Creating an electromagnet as powerful as an NeFeB magnet with same size

Is this possible?So I'm working on this project on levitation using superconductor and strong NeFeB magnets. I'm try to determine the possibility of replacing the magnets with electromagnets equally as powerful and of the same size if not smaller. But I'm bit skeptic about the idea as I'm not sure how possible it will be to construct such electromagnet (or buy them preferable). Is this something that is possible? can anyone reading this give me recommendations? thanks

Topic by gjimoh 8 months ago  |  last reply 8 months ago

### Is a CRT monitor just any one that isn't flat, but with a bulge at the back? Answered

It would be great if it is, because I have 2 or 3 around and want to make the electric levitation device.

Question by XOIIO 9 years ago  |  last reply 9 years ago

### how to build a strong electro magnet?

For my project, i would like to build a strong round electro magnet. i would like to know how i can build one.. i mean number of turns, current, diameter of wire. can we connect the coil to main power supply directly? i need a very strong magnetic field, one of my purpos is to levitate another magnet with out any support of strings (freely suspending in air). thanx in advance.

Question by allsparkunleashed 6 years ago  |  last reply 6 years ago

### can atoms be moved in elements such as gold by manipulating electrons while thier moving around the atom? Answered

I want to know if it is possible so I can build a device to levitate a piece of wood with electromagnetic fields.#

Question by nerd7473 7 years ago  |  last reply 7 years ago

### Anybody think they could show me how to make an electromagnetic MagLev track? as simple as possible please.

I want to do a science fair project on the matter but im going to have some fun with it and make one into a nascar track ! haha

Question by vikings84 9 years ago  |  last reply 9 years ago

I really like this television show. The masked magician show how to do great tricks and illusions. I even did some at school. Like levitating, walking on water, cutting someone in half and the wine and needle trick. Do you like it ? or what do you think ?

Topic by arylic 9 years ago  |  last reply 9 years ago

### what should I do with the disk drive motor stator what projects could I do?

I was thinking an ark reactor model or a small decked out diamagnetic levitating art piece sculpture thing I got it out of a laptop if anyone is wondering

Question by nerd7473 6 years ago  |  last reply 6 years ago

### Floating table held by strings with pulley system for up / down?

My room is rather full so i had the idea to build a table that can be lifted up to the ceiling when not needed to save space and act as a cool feature.  My room has a slanted roof and the section that's not slanted ( in the middle) is 43 inches wide and 100 inches tall. length isn't a problem(more than 100")this spot would be an optimal place to build the "levitable". I have access to pulleys and string and all that stuff so i can build it no problem, but I'm not a master with ropes or pulleys or mechanics and I don't know the best way to make this work. Thanks a lot!!

Question by sky0 8 years ago  |  last reply 8 years ago

### Distance sensor for Arduino?

I want to make a sort of self-educating machine as a programming project: there is an electromagnet and a magnetic thing and if the distance between  the magnets has increased between two measurements the Arduino lowers the current through the magnet, and if had fallen (the distance, not the object) it ircreases... In some time it should be able to reduce the aplitude of the object's oscillations. Is there a good and easy way to make a non-contact distance sensor? AND Is it possible at all????

Question by gruffalo child 8 years ago  |  last reply 8 years ago

### Embedded video bug

I updated a video in my I'ble for the EL wire contest judging period. Now the video is gone and alas, I am not a finalist! Sadness :-( Whether or not the video had to do with the judging, it looks like embedded videos are not displaying from Vimeo. I tried a couple times with a couple videos and none will display in my published I'ble. (https://www.instructables.com/id/EL-Levitation-Wand/). Thought you'd like to know.

Topic by izzyinsf 8 years ago  |  last reply 8 years ago

### Electromegnetic Levatation Glove?

I've seen some devices which use electromagnets controlled by microchips (like this https://www.instructables.com/id/Electromagnetic-Floater/) to levitate small objects. I'm wondering if that same technology could be put into a sort of glove, allowing the user to levitate small metallic or magnetic objects, and maybe even pull or shoot* them? It would have a small electromagnet in each fingertip, as well as a larger one on the palm. All electromagnets could pull upwards on the object if the palm is facing down, and the object was below them. Only the fingertips would pull if it's facing up, and the object is above the palm, (but slightly below the level of the fingertips) The problem would be sensing where the object is, and adjusting the power of each magnet based on that position, and the the position of the electromagnets. *using actual magnetic repulsion would be tricky, but you could, say, have the object sit in the palm of the hand, with fingers outstretched,  then have it attracted to the electromagnets in the fingers, which turn off just as it passes by them. It retains its momentum and shoots out. So, if anyone want to confirm if this is feasible or not (or even want to make it), please post!

Topic by Vick Jr 9 years ago  |  last reply 8 years ago

### Banana Split on a Stick, Bamboo Bicycle, Cardboard Coffee Table

Banana Split on a Stick Bamboo Bicycle Cardboard Coffee Table String Art Necklace Oatmeal Pancake Perforated Pizza Peel Stargate Gong Build a One Sheet Boat Machine Your Own Guitar Lacy Un-Mentionables EL Levitation Wand Exploded Photo Collage Install a Bamboo Floor Easy Bike Trailer Hitch Survive Zombies with Tea

Topic by randofo 8 years ago

### How to build one of these electro magnets?

Ive seen plans to build electro magnets where a metallic object is dangled upside down. this company inverts it so the metallic object is propelled upwards. from some of the pictures ive found it looks to be four magnets working together. any one have any info on building one from scratch? the first site below have videos of it in action. http://www.floating-lamps.com/floating-technology/ www.crealev.com

Question by autoflow 7 years ago

### Where can I find strong ring magnets?

I want to make a magnetic levitated suspension. I am not sure it will work as I expected. But I need em' ...... Somebody please tell me where I can find em' I don't wanna spend so much for those mags neither do I want to damage costly things to take those mags outta them.... I thought of using electro magnetism....but i am still learning more about it and that procedure is damn expensive Please help

Question by SravanamE 3 years ago  |  last reply 3 years ago

### VAWT a new way to wind generation

Guys need help to realise its feasiblity and pros & cons. This project will comprise of a renewable energy source which is controlled by TI msp430 controller by closed loop system. This renewable energy source will use a magnetically levitated vertical axis wind turbine with single phase permanent magnet alternator made by our team. There will be 3 stationary wind guide vanes/flaps of concave shape on the outer periphery of turbine. These vanes will be controlled by dc gear motor for constant wind flow and protection against high speed winds. Using perturb & observe MPPT algorithm on DC-DC boost converter, constant DC voltage for GRID integration is made. A lower energy Bluetooth module will send data on user computer about whole system parameter, hence making the whole system to be smart and hence data is saved in database. https://www.youtube.com/watch?v=fC5hYLjhO9U

Topic by nitcool 4 years ago  |  last reply 4 years ago

### VERTICAL AXIS WIND TURBINE FEASIBILITY HELP

Guys need help to realise its feasiblity and pros & cons. This project will comprise of a renewable energy source which is controlled by TI msp430 controller by closed loop system. This renewable energy source will use a magnetically levitated vertical axis wind turbine with single phase permanent magnet alternator made by our team. There will be 3 stationary wind guide vanes/flaps of concave shape on the outer periphery of turbine. These vanes will be controlled by dc gear motor for constant wind flow and protection against high speed winds. Using perturb & observe MPPT algorithm on DC-DC boost converter, constant DC voltage for GRID integration is made. A lower energy Bluetooth module will send data on user computer about whole system parameter, hence making the whole system to be smart and hence data is saved in database. https://www.youtube.com/watch?v=fC5hYLjhO9U

Topic by nitcool 4 years ago  |  last reply 4 years ago

### VAWT a new way to wind generation

Guys need help to realise its feasiblity and pros & cons. This project will comprise of a renewable energy source which is controlled by TI msp430 controller by closed loop system. This renewable energy source will use a magnetically levitated vertical axis wind turbine with single phase permanent magnet alternator made by our team. There will be 3 stationary wind guide vanes/flaps of concave shape on the outer periphery of turbine. These vanes will be controlled by dc gear motor for constant wind flow and protection against high speed winds. Using perturb & observe MPPT algorithm on DC-DC boost converter, constant DC voltage for GRID integration is made. A lower energy Bluetooth module will send data on user computer about whole system parameter, hence making the whole system to be smart and hence data is saved in database. https://www.youtube.com/watch?v=fC5hYLjhO9U OR YOU CAN SEE https://www.instructables.com/id/Building-a-new-type-Vertical-Axis-Wind-Turbine-VAW/

Topic by nitcool 4 years ago  |  last reply 4 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?

Topic by daswokster 8 years ago  |  last reply 7 years ago

My skills include:  electrical engineering, welding, programming, re-using, muffins Here's a link to my featured Instructable: https://www.instructables.com/id/%22Beating%22-LED-Heart-T-Shirt-finished!/ What I'd like to make for someone:  Bike Speedometer Kit/ EM levitation kit/ metal sculpture I'd be willing to make this size gift package for someone: s,m,l I'd be willing to receive a smaller or larger size gift package from someone than the one I make for someone else: sure! What I like:  functional things, educational things, things that make you go 'WOW', hand-made things, re-used things, art, visually stimulating/pleasing, elegant, muffins :-P What I don't like: cupcakes, k'nex/legos. I absolutely can't have: Type of thing I'd love to receive:  A functional/mind-grabbing piece of art.  Alternatively, something solar/energy related. Would you be willing to ship to an address outside your own country?  Yeah, sure. Confirm that are at least 18 years old: I'm 18++; [opt] januaryelement is someone who can keep a secret and knows me well.

Topic by T3h_Muffinator 8 years ago  |  last reply 8 years ago

### Group : Collection of Instructables for class-room and teaching purposes ...

Hi !I created a group that seems not to have been ever created here yet."Class-Room" group.The main purpose of this group is to make a collection of every instructables that may be useful for school teaching, and that may be reproduced by pupils or students as science-fair or class-room projects ...Please, add your Instructables if they fit this description._Biology :"Be a Scientist : map your skin"Chemistry :"Carbonating""Kitchen laboratory II : The CO2 trap""Make crystal clear ice !""Make Rheopectic slime in less than 15 minutes !""Shelling a raw egg !""Sodium Acetate"Investigations :"Amazing Kite For Under \$5""How to make Playdough (Play-doh)""Oobleck""Pop-Up 3D words and messages !""The Huffin' Hoopster""The Improved CD Hovercraft."Physics : Electricity & Electrostatics :"Build an Electrostatics Motor""Jacob's Ladder Sculpture from found materials""Kelvin's Thunderstorm : Create lightning from water""Paper Resistor"Physics : Instruments & Measures :"Be a Scientist : Make your own force-meter.""Be a Scientist : Make your own thermometer"Physics : Magnetism :"A simple mechanical resonance demonstrator""Diamagnetic Levitation Experiment"Physics : Optics :"Naff Movie into _DVD-Spectra_""Optical Water-Prism"Physics : Sound :"How to measure the speed of sound ...""Mechanica Wave Driver for Chladni Plate"

Topic by chooseausername 11 years ago  |  last reply 11 years ago

### Robot Pegasus design possible? Answered

Ok, so I have another idea that will most likely never get anywhere due to my lack of funds/it not being possible.           What if I made a magnetic track somewhat like a maglev and had a robotic pegasus with electromagnets in its feet. It would also be an ornithopter to get it farther than a few inches off the ground. I would have the magnetic track to have it hover a few inches off the ground for about a minute before and after takeoff to make it less likely to crash on landing and give a minute to text the mayor to not worry about any upcoming pegasus sightings above or around town before taking off.           What kind of horsepower engine would I need to power the wings enough to get sufficient lift (at least 15-20 feet)? And would the electromagnet buffer before landing be significant enough to at least lessen the impact so it doesn't maim/kill you if you crash?           The electromagnets don't seem to me like they would work, but it would still be fun just to hover it to show it off without flying up 20-30 feet and worry about falling. Also, would it make it too heavy to fly if I put in an extra motor to make it walk/run so it doesn't have to be flying to move? I don't really expect this to be within my budget, but it would still be cool.

Question by ALogan97 7 years ago  |  last reply 7 years ago

### Miniature chainsaw, mortar and ping pong blower

(a few tiny ideas) Basically a toy chainsaw that can cut through paper. Using hobby-R/C-like parts such as those tiny light motors would be a start. Reduced size, like a cellphone at most, mountable on a figurine soldier would be great. The miniature mortar should throw marbles on "mortar trajectories", you should be able to set the angle of the launch and (optionally) somehow the speed, though this wouldn't be necessary if the angle part is done well and the power is relatively constant at all shots. For ease it should be built only for angles above 45 degrees and the angle slider (or whatever the solution) should have marks (ticks) such that a user can remember and even create tables if he so wishes, in his war against coffee cups. Simplest solutions of "powering" would be rubber bands or coils from broken toys. A ping pong blower would be a tiny but strong fan (brushless outrunner motor) that keeps a ping pong ball "levitating" in mid-air straight up, but most excitingly even blown under an angle too. This wouldn't be a problem (physics takes care of it alone) just that the mount of the fan (ducted or not) should be operated and tilted as needed. This "levitron" would be a nice display on the desk running as long there's juice in the battery or else. Sorry if I'm not posting in the right place, these are just some ideas i'd love to build but i'm too clumsy and lazy :( Though my source of inspiration is the variety of USB gadgets commercially available, i'd like these to be more "free" and simpler if possible.

Topic by screwgravity 10 years ago  |  last reply 9 years ago

### Making a magnetically suspended puppet. Answered

Hi, I'm thinking of making a magnetically suspended puppet. The idea is to make a puppet with a neodymium magnet in its head, and suspend it under an electromagnet, using a microcontroller to control the (DC) suspension current. To regulate the current, I'll probably use a D/A converter chip controlling an op-amp current sink, though I might use low-pass filtered PWM D/A conversion. I was thinking of a way of sensing the vertical height where I put a small chunk of metal in the head as well as the magnet, modulate the suspension field slightly at a high frequency (20 kHz?), and have an extra sense coil around the suspension coil. The idea is there would be an induced current in the sense coil from the modulation. This would change as the metal chunk came nearer to the centre of the coil. The signal from the sense coil would go through a high-pass-filter (to remove any low frequency components like mains), an op-amp rectifier, and then a low-pass filter, to produce a sense voltage. I might try both para- and dia- magnetic metals (iron and aluminium) to see which works better. I'm not entirely sure whether this will work, but I'd like to try it as it seems more elegant than using a hall effect sensor. The questions I have are: - How would I go about calculating roughly what length of wire and current I'm likely to need to suspend a given weight? Just a pointer to the relevant maths should be OK - don't feel like you to have to spell it out. - Does it make any difference whether the electromagnet is long or short along its central axis? I had an idea that the field from a longer coil might extend further below the magnet than one from a shorter one, but I don't know if this is so. - Does the method I've described for sensing the height sound practical? Thanks for any help, andy (ganglion)

Question by ganglion 6 years ago  |  last reply 6 years ago