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Made in gb
Hanging Out with Russ until Wolftime







It is a shame you arnt doing Dark Eldar.

I had a crazy idea where I had it attached to the base with Slave Catching Hooks attached to poor Guardsmen and repelling magnets pushing it up, so the ropes kept it in place but it looked like it was hovering.

This message was edited 1 time. Last update was at 2009/03/06 09:49:03


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Made in gb
Lord Commander in a Plush Chair





Beijing

tuatha1337 wrote:To those who don't think I can get magnets strong enough. I know exactly where to get my magnets and I know exactly how powerful they are. Some I have the ability to acquire have a pull force of over 500 lbs and can adversely affect any sensitive electronic equipment from more than 3 feet away. (This is why these magnets are required to be shipped via ground.) Granted, I won't need anything nearly this powerful.


I hope not, people with pacemakers might want to go near your models.
   
Made in us
Deadly Dire Avenger




Portland, OR

Agamemnon2 wrote:
tuatha1337 wrote:To those who don't think I can get magnets strong enough. I know exactly where to get my magnets and I know exactly how powerful they are. Some I have the ability to acquire have a pull force of over 500 lbs and can adversely affect any sensitive electronic equipment from more than 3 feet away. (This is why these magnets are required to be shipped via ground.) Granted, I won't need anything nearly this powerful.


Power isn't the problem, it's precision. As Earnshaw's theorem states, achieving magnetic levitation with static magnets is impossible because at the best case scenario, you'd achieve an unstable equilibrium that things like air currents, gravitational anomalies or nearby magnetic fields can alter.

The method described in the HFML link upthread is theoretically feasible, at least insofar as it explictly circumvents the theorem's effects, but it'd be a balancing act not only with weights but with magnetic field strengths and I believe the ensuing system would still be vulnerable to outside forces, such as table-bumping.

I'm well aware, my friend; and, indeed, precision is key. I'll be purchasing a Levitron Anti-Gravity Globe in the near future and see if I can customize that enough to support my Falcon. The problem is, does anyone know a place where I can get one of those Anti-Gravity bases for cheap, perhaps customizable for various weights?
   
Made in us
Rampaging Furioso Blood Angel Dreadnought





SC, USA

What you are lookinf fo ris a Hall Effect set up. Has a magnet in the center of the model, electromagnets set up over and under the model that are powered and hooked up to a fairly simple circuit. As the models moves, the circuit adjusts power to the upper and lower electromags to compensate. The further it moves down, for example, the more power is fed ot the upper magnet thereby increasing the pull upwards until equilibrium is approached. best part about this set up? It's never really still. There is usu. a constat, if slight motion to it as it is constantly compensating. Recommend placing magnet @ model COG, and oyu can track down the sensor diagram on the net, I think Wikipedia has it. It's fairly simple, but takes some stuff to execute.
   
Made in gb
Fresh-Faced New User






Hi guys,
I recently created a magnetically levitating Eldar jetbike here:

http://www.dakkadakka.com/gallery/725191-Magnetically%20levitating%20Eldar%20jetbike%20conversion.html

https://www.youtube.com/watch?v=9NlKPA7HtT4&google_comment_id=z12bdvyh3si0w5ivo22xz1iocnvkcjc5k04&google_view_type=#gpluscomments

I hope you like it
   
Made in us
Longtime Dakkanaut





You probably do NOT want to "spin" a neodymium magnet in the base, as this will cause the miniature itself to spin.

Magnets have a N/S pole.

And to float something above them, you need to have the N/S poles on the magnet in the object being floated aligned with the base.

There are novelty pen-holders (and very expensive pen-sets) which "float" the pen above the base using magnets mounted within the pen.

Most of them use a back-stop, which keeps the pen from flying off the mount.

The issue with "Magnetic Levitation" is that for an object to get a stable "lock" on the base, you need to have either a Superconducting Magnet (thus at temperatures of a few dozenÂș to a hundredÂș or so kelvin). Or you need to have some mechanism to control the Eddy Currents in the Magnet:

https://en.wikipedia.org/wiki/Magnetic_levitation

Basically, the best you can do is to "fake" the levitation by installing a stabilization piece, or, spend some time and money getting the electronics to control the balance or the levitated piece. The latter is probably not exactly simple (but not ferociously expensive, either).

MB

This message was edited 1 time. Last update was at 2015/06/30 13:31:33


 
   
Made in au
Incorporating Wet-Blending




Sydney

   
 
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