h a l f b a k e r yNaturally, seismology provides the answer.
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By attaching a small ring with fins on it to the outside of a CD, it should be possible to create a CD drive that uses air to lift the CD an inch or so above the drive, and spin it there. (The economy model could attach a small clamping mechanism to the center of the CD with a "leash wire" limiting
the CD's altitude.)
Not very useful, but I'd expect that the Sharper Image would sell out quite quickly.
Levitating Globe
http://shop.store.y...niverse/tt-272.html
You could use this sensitive electro-magnetic technoligy to float the cd in the air... [oxygon, Apr 25 2002, last modified Oct 04 2004]
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If its only purpose is a "cool factor" then I am "sure" you
could pull it off... |
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You would have to attach a small metal ring to the center
to use the technoligy in the provided link... |
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I wouldnt use air... to noisy and wastefull of energy... |
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This all sounds good, and I would probly think it was awesome looking in a sharper image catalog, but one quick question: How would you make it stable enough for the laser to read the tracks? |
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Howabout this: a very thin metal pole (think 1/32") that stabalizes and spins the disc? That way the laser could stay in the base and still read the disc (adjusting for focus, of course) |
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It might actually need to be a powerful magnet ring... I don't know exactly what amazing maglev technology this thing uses, but I've seen two similar ways of doing it. One involves a feedback circuit and electromagnets, the other diamagnetism(I think). |
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But it would look really cool! Especially if you attached funky colored lights or lasers that reflect off the bottom of the CD to make a light show... Build in a mist generator and you're all set to fire up that bowl! |
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I've seen those globes. They're neat to look at, but not all that useful. Sort of like this idea. |
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I bet the same people who bought the globes would buy this. |
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If I had that kind of money to burn on levitating globes, I'd buy stuff that I could build one with and waste my time tinkering with that and learning the relevant physics. |
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Say, what you could do is just have a white light or laser or whatever shining from the device, but have the cd have intricate coloring embedded in the plastic(while still letting it be readable by the laser), to manipulate the reflection of the shiny light. That way you could "program" the way the light changes as the cd spins. It could develop into a whole new art form :-P |
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I think this could be baked and i'd buy
one:) the Globes work with an
electromagnet on top and a hall effect
sensor underneath when the hall effect
sensor senses the magnet in the globe
falling it applies more power to the
electromagnet up top, I figure the hall
effect sensor could also be used to
control the focus of the laser
compensating for the disk bouncing
around a bit. You would need some
type of magnet setup to put in the hub
of the cd, then there is the problem on
how to spin it. The diamagnetic setup
could also be used but considering
diamagnetic force is so weak you would
probably need to enclose the whole unit
in a case. Anyway the idea is kinda
baked the other way around in hard
disks only thing is the read heads are
levitating and not the disks. |
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