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Investigating Angular Velocity
mbreitba writes "Sam Barros is at it again, Some may know him for his Railgun research, and some may know him for his homemade cannons. But now he's found a use for all those old CD's you don't need anymore. Personally, I couldn't think of a better use for them."
52x isn't the max its 172x!
I don't care if the cd could come out of my burner fly across the room and explode into a billion pieces, I wanna 172x burner!
seriously though, why do they only try to spin the cd faster. why not spin the laser in the opposite direction the cd is spinning in?
bite my glorious golden ass.
Copyright © 2002 by Sam Barros. All rights reserved. Removing any material from this site for display without consent from its author consists in an infringement of international copyright laws and can result in fines up to $50000 per infringement, plus legal costs. So ASK ME before you remove anything from here.
Oops, if anybody visited the site and it was all blank, sorry, that was me after I removed his content! I'll put it right back.
I love reading all the different ways people threaten in their copyright notices.
But wasn't a better version of this concept posted here like last year? A guy put the CD in a real high-speed, high-torque moter (not a dremel) and watched it shatter on the spindle.
This guy is just spinning them fast on a dremel tool and watching them shatter when they hit the ceiling, not quite as impressive!
Yes, that is awesome and I am going to have to try it, but after watching the video it took me a little while to figure out that what I thought was a female voice at the end was actually his!
(\_/)
(O.o) This is Bunny. (> <)
turns out most cds explode at 28k rpm according to this story from a couple years back. and even then it was a dupe.
... or put 'em in the microwave for a couple of seconds, shiny side up. Put a sheet of paper below if you don't want to stain the glass plate.
Trollem mirabilem hanc subnotationis exigiutas non caperet
I have a full copy of that page, with the videos, but no way am I mirroring when the author of the page threatens to sue for $50000 at the bottom.
I bet in the future, you'll be able to get "legacy" CD-ROM drives that just take an optical image of the whole disk once, load the content into a buffer, then eject the disk, in about 5 seconds.
That would be cooler than 12,983x drives.
Whoopie, another story for Power Labs. What's their slogan again ? "We know just enough science to wreck something, then we call it an experiment."
In Soviet America the banks rob you!
Dang! Where are all those AOL CDs when I actually WANT them?
From the site:
A standard compact disk has a diameter of 12cm. If this disk is to spin at 35000RPM, the peripheral velocity at the edges of the disk (.377m circumference x 583.3 turns per second) will near 220m/s, or 722fps, or 792km/h or 492miles per hour. That is one fast CD-Rom!
At those speeds the CD is storing over 150joules of energy.
I wonder if Freezing the CD would make for even more spectacular explosions... after all the speed and energy stored in the CD is really ridiculous.
Freezing usually makes most things more fragile, right?
.: Max Romantschuk
When I saw this movie more than 10 years ago, I remember people where discussing wether the CD's the alien used could withstand the torque. It has now been verified that the movie was unrealistic
Actually it probably makes sense considering he also has a "Chemlabs" page he was probably stoned at the time.
__
Cheap Web Hosting
consists in an infringement of international copyright laws
Yow! I think he CONSISTS in an infrigement of ENGLISH GRAMMAR LAWS!
'nuff said.
-Shane
I love teh int4rw3b!!!!!111one1
This is a dupe of thiswhich was a dupe, funny that. Here is a mirror of it (the first dupe), since the site was taken down: My Mirror
Your hair look like poop, Bob! - Wanker.
Guess I should call Big Broth^H^H^H^H^H^H^H^H^H Ashcroft at T.I.P.S. to let them know that AOL has apparently been engaging in some very suspect "terrorist-like" activity, filling my mailbox with potentially dangerous explosives for years.
He also notes the disk speed is lowered due to aerodynamic drag.
Personally, I would have been impressed if he had done something to the disk, maybe going over quarters of it with a black felt pen so an optical pickup could have determined its RPM, instead of guessing.
At those speeds, gyroscopic effects can really be exaggerated! Gyroscopic effects alone can result in some really bizarre behaviour when the plane of rotation is changed.
This experiment reminds me the time we got a flywheel spinning off the table-saw motor in high school shop. The flywheel got away from us when unexpected gyro forces wrenched it from our hands. The damage that thing did was talked about from then on to beyond the day I graduated.
"Prove all things; hold fast that which is good." [KJV: I Thessalonians 5:21]
Perhaps I'll ust take his idea which he says, "DO not attempt to replicate any of the experiments described below!" (And I like how the "DO" is capitalized instead of the "not"), and break a few CDs, arrange the pieces in different ways, take a picture of it, blow it up, and sell it to an art studio. =D Profiting from the ideas of others!
(\_/)
(O.o) This is Bunny. (> <)
There are lots of uses for old CDs:
Coasters
Soap dish (after a bet of melting and remolding)
Lamp (in the process of building one. You stick a large stack of them together, ream out the center and stick in a bulb)
Any others?
spin the cds that fast and accelerate them like a frisbee, now try and catch it...
You'll shoot your eye out!
No boom today. Boom tomorrow. There's always a boom tomorrow. - Cmdr. Susan Ivanova
A few years ago, myself and a friend found another, equally interesting use for old CDs:
You can use a stack of them hooked up together as a big high-voltage capacitor!
We connected them all up, then passed in ~20K volts, and it really could hold it's charge (I can't remember the numbers - since then, I've lived in amsterdam for 3 years, and a'dam tends to have a negative effect on ones memory....). What was amazing was when you hooked it up to the powersource, all the disks were attracted to each other and clamped up really tight.
Discharging the thing was amazing, and the 'zap' (for want of a better word) could easily burn through some thick paper...
Maybe when I've got some time I'll repeat the setup, this time with some photos, then I'll enjoy a good ol' fashioned slashdotting...
tom-george.comBecause geeks rate higher t
Have you ever loaded a faulty CD into a high speed (30X or higher) CD-ROM player, heard it spin up to incredible speeds, rattling and whining, and thought to yourself: "this thing is going to explode"? When CDs came out they were heralded as the solution for the need for high storage-high speed information devices, transferring data at a whopping 150kb/s, but like all technologies, 1x CD players quickly became obsolete as the need for higher and higher transfer rates pushed for faster players, and, with them, higher rotational speeds. As we advance into the 21st century CD players are reaching the ultimate speed limit: we are getting to the point where the CD player simply can not spin the CD any faster or else the CD will literally fly apart. On the interests of the advancement of high speed computing PowerLabs brings to you:
THE ULTIMATE CD SPEED LIMIT!
WARNING: This page is written for amusement only: These experiments are VERY hazardous!; A high speed rotating CD Rom is a bomb ready to explode and will send razor sharp plastic shrapnel in all directions when least expected. DO not attempt to replicate any of the experiments described below!
Setup:
Before an experiment could be devised where a CD would be rotated to complete failure, a proper motor had to be obtained that would be capable of achieving those high rotational velocities with the load presented by a CD. Although a CD is very light and aerodynamic, when it starts to spin at a couple tens of thousandths of rotations per minute the drag created by air around its surface can be to slow the motor down considerably. High torque motors are very common and cheap, as are small high speed motors. Unfortunately however, high speed, high torque motors are a much rarer and expensive find.
My choice was to use a Dremel tool as the motor. It was cheap, easily available, and, more importantly, the rated 35000RPM spindle speed meant that it had some real potential for spinning things to destruction.
At 35000RPM very small imperfections and balancing errors can lead to extreme vibration; so much, in fact, that it would be possible to damage the bearings or bend the axle on the tool if something as heavy as a CD was to start wobbling (bear in mind that the Dremel tool was designed for very small, light weight loads and even then many of its attachments carry warnings not to be used at full speed). One of the first challenges of the research was to find a means to secure the CD perfectly in the middle of the tool. A custom made CNC lathe spun aluminum holder was considered but before I ever left the room I realized that the cylindrical sanding attachments Dremel makes not only fit a CD hole perfectly, but also have adjustable width so that the CD could be gripped in place. With the CD in place and the dremel plugged in, it was time for the fun to begin!
The Dremel was switched on and the rotational velocity was gradually increased to its maximum, at which point the CD hummed and whined in a very menacing manner. Mildly disappointed that it had not exploded, I realized that it wanted out; a quick jerk at the tool and the CD slid out of the holder and contacted the carpet whilst spinning at ungodly speeds. It peeled out a bit in front of me and proceeded to make its way to the door at a very high speed. On contacting the closed door, the CD did a most unexpected thing: it first bounced back a few inches, and then, when it hit the door again, it jumped straight up the door and struck the ceiling, exploding into thousands of fragments which rained down on the entire room. This first experiment was unfortunately not videoed, but it served to get everyone in the room to put glasses on and cower away behind pieces of furniture, whilst people in the hall corridor quickly made their way to my door to ask what was going on. Now, with an audience, the camera was taken out and the real experimentation began...
ÂA standard compact disk has a diameter of 12cm. If this disk is to spin at 35000RPM, th
Last time this happened his site was slashdotted and consquently due to bandwith caps wasnt up till 3 weeks later. Wait till he finds that he has been put on the front page again. Better start looking behind our back's for some guy with a dremel and a couple of AOL cd's.
I'm a geek deal wit it
I once had a CD explode in a 56x CD-ROM drive.
(that happened to anyone else?)
Here's a quote from the manual of my CD-RW drive:
The PlexWriterâ(TM)s reinforced tray bezel and drive bezel can resist the escape of the disc or disc fragments in the event of disc failure at this high 48X speed.
I knew it was worth paying the extra for the Plextor. Although such an event would almost certainly wreck the drive, it would still be a pretty cool story.
I had an unpleaseant experience with angular velocity myself. Two years ago I bought a Pioneer 105s DVD drive and downloaded some region-unlock firmware from a guy's site (farzeno?). After this the drive did play region-free, but started sounding weird. After a while I heard a loud sound - the CD exploded and wrecked the whole drive's hardware. The drive was ready for the trash bin.
The RIAA has it's secret methods.
This picture is great. The guy is sitting on the floor looking at a 35000 RPM CD which is most certainly going to explode, and wearing nothing but a pair of (what looks to be) sunglasses! He looks like a little kid whose found his first book of matches and is mesmerized by fire! I can't view the video (./'d) so I can't comment of his actual procedure, but from the looks of things he could have been in for a world of hurt. At 35000 RPM, that plastic might as well be concrete, or glass.
I keep having these dreams about things exploding. Tonight it was my microwave. I filled it with AOL CD's, set it to 'Aggressive Defrost', and sat down with a beer. The explosion took off the roof of my house and sent it into space. This dream gave me another great idea I can't wait to try: sending cargo into space by blowing up AOL CDs.
Wednesday, 7pm.
It did not work. The neighbour wants back his microwave, and my son is asking me where his music collection went to. Well, that's one positive angle, anyhow.
Thursday, 5am.
That dream again. My subconscious is trying to tell me something. Maybe I was using the wrong brand of microwave...
Friday, 8pm.
I think I've cracked it. Instead of just one microwave, you have to imagine a Beowulf cluster of the things...
Sig for sale or rent. One previous user. Inquire within.
Look at the counter on the guy's page : it has only 4 digits. How much do you bet it already rolled over a hundred times ?
..."
I can just picture the guy in trance mumbling "no, no, I'm not slashdotted, my server isn't smoking, it can't be, I only have 4000 hits so far
"A door is what a dog is perpetually on the wrong side of" - Ogden Nash
You mean:
You've Got Jail!!!!!
Government is the monopoly on the legal (socially accepted) use of coersive force. Think about this next time you vote.
/* story Ripping Vinyl Via Your Scanner?
Actual site http://www.cs.huji.ac.il/~springer/
there were silicon wafers. I was working in the "front end" of an integrated circuit manufacturing site on a machine that develops the exposed photoresist on a silicon wafer. I had the guards removed. I put a wafer on the chuck, turned on chuck vacuum to hold it in place, and spun up the chuck (to about 3000rpm). Just as I turned away to get a tool, the chuck vacuum let go. Talk about "Spinning Buzzsaw of Death"! Fortunatly I had safety glasses on, and the wafer was down inside the machine. Besides not showing up well on X-rays, the wafers contain arsnic, boron, and phosphoric salts.
Chaos maximizes locally around me.
Hang one from the ceiling with a string near a window. It will reflect the sun in to a fairly bright spot somewhere on the floor or wall, give it a little spin. Your cat will chase it as if it's some kind of small rodent but of course never be able to catch it. This may work with exceptionally stupid dogs too. Laser pointers work just as well but require more user interaction.
0000000 0000 ba01 0021 0001 8001 5d16 0000 bb01
...more of the same
0000020 0c00 1680 055d ffe1 e0e0 c02e 20c0 0000
0000040 be01 dc07 ff0f ffff ffff ffff ffff ffff
0000060 ffff ffff ffff ffff ffff ffff ffff ffff
*
0004000 0000 ba01 0021 0a01 8031 5d16 0000 e001
0004020 f307 2e60 0031 9601 1107 0100 917e 0000
0004040 b301 0014 c4f0 ffff b8e0 0000 b801 0880
0004060 4000 0000 0001 0f00 f8ff 0000 0101 f96b
0004100 19ee 4cc7 5b59 835a f211 55fe 3761 f1f4
0004120 5c46 bd6b 9624 0f52 6aed 4c33 6ecd d3fa
0004140 4ad5 78f5 93b2 72db 5375 c5c0 e386 3f6b
0004160 9225 8e50 ef2c 8677 86f9 7fa4 71b5 2357
0004200 9c55 19ac 9fb3 5ddc 1878 cc1c dc3a 8f37
0004220 0df2 bb48 8d4e b6cc 114a efd9 03a0 ca1d
0004240 4ae8 1003 ef91 59bf d78e 0911 d2e4 9190
0004260 608b 6caf 2903 721f 4b90 232f 9d6f 5277
0004300 1143 a8c7 ce5d 8c80 f4da 9824 db82 3ff4
0004320 15b1 56d2 7f64 eb83 bc9c d007 84aa f912
0004340 38c3 b97e f6d1 4fdb edef 2fb9 faac 90d0
0004360 ae25 4b5f 8f14 bff1 e970 f751 dfb9 ad0e
0004400 fbb8 b2ed e179 ea84 56d2 5004 155c 8d78
which may cost you up to 5000$
But why copy the text if the pictures are the most interressing part?
Will not function likely with a standard scanner since the wavelength do not match, just have explained that.
h ol d=0&commentsort=3&tid=137&mode=thread&pid=6168826# 6169070
http://slashdot.org/comments.pl?sid=67125&thres
--
Karma 50, and all I got was this lousy T-Shirt.
no problem my scanner does 65,536 dpi interpolated!
bite my glorious golden ass.
You sir, are an expert troll.
Hmmmmm..... after a minute of thinking. Lasers, among many things can be aimed at very very high speed (ever been to one of those laser light shows?) How about a lens or mirror that spins and a laser that merely utilizes that mirror or lens by aiming at it?
Please people, if youre gonna troll or just make asinine, narrow-minded comments, at least log in so we can list you as "foe".
I did it more than one year ago with a friend of mine, we actually managed to put the disc on the floor spinning at 15K RPM and making it run across the office at high speed for 50+ meters.
:)
:))
We used a pencil to push the disc away from the dremel, if we had to force it for more than a fraction of seconds, the pencil would smoke
At the highest speed the disc exploded (well... it was already damaged, we almost knew it would) and some SMALL piece is still stuck in the roof...
Don't do this at home!
(do it at the office
Just how fast is "a couple tens of thousandths of rotations per minute"??
Hrm; better yet, convert it to vinyl, then scan the vinyl!
What is "How many geeks does it take to burn a CD?"
I heard a story years ago at college of a windmill that was accidentally left running in gale. Apparently the tips of the blades caused a sonic boom!
Dunno if theres any truth in that though.
If you use 2 lasers, you could burn the disk twice as fast, 3 lasers 3 times as fast, 4 lasers ... up to the point where the heat shock destroys the CD. New meaning to the term "burn" a CD.
You will also get a lot of really smelly fumes from the ignition.
I have no idea of the toxicity of these fumes, but I can tell you your pizza will taste funny the next time you use the microwave oven to prepare it.
So, if you wanna experiment, do it in someone else's oven.
"Prove all things; hold fast that which is good." [KJV: I Thessalonians 5:21]
Now I know what to do with that new metallica cd. *shudders* damn that saint anger
anubi is absolutely right. Open a window and don't leave the CDs in your microwave for too long. I wouldn't breathe the fumes either.
I would mod him/her up but I can't because I posted this comment's grandparent. Can somebody else please do it?
Trollem mirabilem hanc subnotationis exigiutas non caperet
Too bad his .mpg of the most spectacular explosion wasn't caused by the CD spinning at high velocity... but was caused by him throwing another CD at the spinning disk.
First the shocking Xbox controller, now the exploding CD, what's next?
Possibly how to connect a used desktop 300W power supply to your family jewels to obtain that much sought after "Ryan Seacrest" hairdo?
Unable to resist...
Ye olde "9 pregnant women having a baby in 1 month" argument... For another analogue that may apply here, it's worth noting that recent developments in semiconductor processing technology includes a move to 30cm wafers, specifically to accommodate parallelism in production.
I don't remember the dates specifically, but silicon production "began" with 3-inch wafers, then transitioned to 5-inch, then 8-inch. So, don't be too harsh on those who suggest doing things in parallel.
Producing 1000 CDs per day? Consider standard pressing techniques, which is nearly as flexible as "burning" CDs but way cheaper and can be performed as quickly as you wish. (Did you know that CD sputtering chambers can contain multiple different blanks?)
If anyone has a mirror of the site I can host it, just message me on aim (traidatwork) or email me.
None of us are as dumb as all of us.
Had one come out and chase me around the lab a bit. An HP VL 400 low profile desktop with a quirk in the CD drive that if you pushed the eject button more than once, it stored the button actions. Pushing it twice quickly resulted in it opening about one centimeter and then closing again. Pushing it three times while the disk was spining full speed caused the tray to open without waiting for spin-down! The disk got air born (only for about half a meter) and skittered across the table after me as I back peddaled away from it in surprise.
The first time it surprised me, the next ten times, I did it on purpose! (Screwed that NT 4 WS disk up pretty well, IIRC).
Any technology distinguishable from magic is insufficiently advanced. - Geek's corollary to Clarke's law
You can find a little info on them here.
I have a 52X that still works well. Quietest freakin' drive I've ever used.
...kid!
(as in "you'll shoot your eyes out, kid!" for those not familiar with the red ryder bbgun story)
a) As the article mentioned, some readers use multiple read heads to achieve higher read speeds with lower spin rates. So higher than 48x is indeed possible.
b) The latest IDE standard can push 133 MB/sec. Even taking into account overhead, an ATA100 7200 RPM hard drive can easily do 40 MB/sec in the real world. (That's what my drive does.)
Since 1x CD is 150 KB/sec, 48x is only 5-6 MB/sec, a small fraction of what even ATA33 is capable of, let alone ATA133.
retrorocket.o not found, launch anyway?
That's something else entirely, which you would've known if you compared the URLs.
Anyone else remember this game? You had a gun that shot CDs. IIRC, there was an Aerosmith soundtrack.
Did you mount a military-grade, variable-focus MASER on an unlicensed artificial intelligence?
You think CDs are bad, try microwaving a circuit board. You know the smell one transistor makes when it dies? Multiply by 100...
The dremels head should be made to be somewhat conic, with the CD sitting on it. Sandpaper is fine around the cone, but should be something with a grip.
And the whole structure should be built on a trolley and two columns where one column carries the trolley and the other touches and pushes the base of the CD at one end. Big rubber bands can hold the trolley holding the dremel and CD with a latch, and once the CD is doing well at high speeds, release the latch to fire the trolley and watch the CD disconnect and fly.
Notes: Make sure the dremel itself doesnt fly. Build a shield in case the CD breaks so you dont kill yourself. Keep some CDs with sarpened edges in case you go out hunting.. can be sharpened on the dremel with sandpaper. Also please note if you shoot into the air, CDs can act like boomerangs. Do not stick around.(remember the results in Unreal)
"Give orange me give eat orange me eat orange give me eat orange give me you." -Nim Chimpsky
Better yet, try to make your own UT weapon in real life. Spin 'em and eject 'em. Get a deer tag next fall and try it out on a real target. Whee!
Thanks AOL!
"You may all go to hell and I will go to Texas"
Sen. Davy Crocket to US Congress, Nov. 1, 1835
anyone have a torrent of the movie.... looks like its being /.ed (hard drive spinning too fast?)
I'd also like to share a sad story of a lab death due to flying glass. Somewhere around 1989, a student at Tulane died when a piece of glassware exploded in his hand and a fragment severed his jugular vein. His death was partly due to the difficulty the EMS team had finding him in the building.
If the author feels this display of his image constitues a "removal" and untolerable infringment, he may send me a cease and desist letter by replying here, the public place of advertisement of publication. In that case, I'll consider him a weenie.
Friends don't help friends install M$ junk.
I'd like to build a few hanging geometric things out of CD's and have not yet found a good way to cut them reliably and accurately. I've tried various kinds of saw, craft knives and the like, hot objects, scoring and bending till they break and so on. Getting a couple good cuts is easy - getting a bunch of accurate shapes is a bit tougher.
This only reflects on your subconscious desires to be sodomized. Why is that trolls of your ilk have such vivid homosexual fantasies? Hmmm... let me think. Is it possibly because you are a CONFLICTED HOMOSEXUAL? Bingo! Now go get some therapy so you can accept that you love men and get on with your life.
I wonder if the burnout he's talking about when the CDROM jumps off the dremel burned his carpet? At those speeds it must get incredibly hot rubbing against the carpet like that.
in the bonds, ppka
Actually even stupider than inhaling fumes from the CD itself is inhaling the fumes from combusted compressed air.
Everyone knows if you take a can of compressed air and turn it upside-down you can freeze just about anything in seconds. If you do this to a CD it actually becomes more pliable, very counter intuitive.
Well some crackhead (read me) decided to put a pliable CD in the microwave and see what happens. Interestingly the compressed air substance for the most part explodes from the microwaves. If you open the door to blow out the burning CD, with the intentions of saving your 1200 watt microwave. Be sure to take a deep breath before you actually open the door. The fumes will not only burn your nose hairs off they will burn you lungs and make it impossible to breath. Plus the aroma makes you want to yak on everything. If you dont actually pass out (which is very tough) it takes better than an hour before you can breath normally again, and about a month for those nose hairs to grow back.
Nevertheless my microwave is fine.
AC
I have long wondered what would happen if a couple thousand people each focused the sun at a specific spot using a CD...
At a podium, for example.. Or maybe a football kicker.
Until a scanner with sufficient resolution exists, the wavelengths can not be judged to not match.
dunno if you have seen this, read about it somewhere on the net ages ago. if you get a grape, and cut it in half, but not all the way through (leave a bit of skin as a hinge), bung that in the microwave and watch the fireworks! the grape usually ends up exploding. very cool :)
It's not circumference times the rotational velocity. It's the RADIUS times the rotational velocity.
.06 m x 583.3 rotations / second (using his numbers) = 34.998 m/s = 114.8 fps = 78.3 mph.
So, for the standard CD thats:
If it really was going 220 m/s, that's a significant fraction of the speed of sound at sea level (340 m/s).
Is to build a Tesla turbine. That way you can harness energy AND eventually watch them fly to pieces.
Seriously, the tesla turbine design is worth a look from any hobbyist. Since it's bladeless, it can handle a lot nastier conditions than a typical bladed turbine can, and is also much simpler to build (my friend's built several breath-powered models out of paper and cardboard).
-Billy
This might make for some entertaining events when you factor in my third floor apartment balcony.
Now I know what to do with those damn AOL CDs other than make windchimes.
The phrase he's looking for might be LESS ductile.
It's better to be the foot on the boot than the face on the pavement. ~~ tkx Kadin2048
It happened here at work a year or so ago. We got some new computers with 30x drives in them, and an Oracle installation CD exploded as it spun up. Destroyed the entire drive and shiny things sort of puffed out the front as the door cover popped off. Pretty cool, really. :-)
Hexy - a strategy game for iPhone/iPod Touch
Saddam, is that you?
autopr0n is like, down and stuff.
Leave the CD stationary, but spin the laser beam. As in, the way a laser printer does, with a high-speed rotating mirror. 172x, here we come!
"A great democracy must be progressive or it will soon cease to be a great democracy." --Theodore Roosevelt
The speed at the edge of the disk is equal to the circumfrence times the 1/frequency.
autopr0n is like, down and stuff.
I got home from a hard day of academic testing today, and this is just what I needed to relieve some tension. I used a few more precautions though. I duct taped the drill to a cinder block in my garage, and I just stood back and plugged it in while wearing welding mask. If you just let it be, the disc eventually spins of the grinding bit and does all those fun tricks. I had to hit it with a broom handle to make it go kablammo. I exploded about four discs. However be warned, even though the scrap flies in a predictable manner (parallel to the discs), a pice could certain fly outside of that range and give you a pretty nice puncture wound.
your pizza will taste funny the next time you use the microwave oven to prepare it.
You use a microwave to prepare your pizzas???
I dunno about the funny taste, but I can guarantee that you're gonna have a nice rubber pizza next time you do that...
Bow bow bow!
(what da ya want for nothin?)
I can see the fnords!
No sense of humor. My point is this guy made his own canon, fired a golf ball at mach 2 into the air, experiments with gauss guns, and spins CDs to 35000 rpm. It just seems like he might have an accident. I guess the mods don't know what a dead pool is, so I should have said Darwin award.
What I really want is to be able to buy a plain old (new) 4X CD-ROM drive. I don't *want* a 32x drive that sounds like a jet engine taking off. And I'm tired of waiting for these "fast" drives to spin up and down all the time. Aarrggh!
I've had a CD in a normal drive (guessing about a 40x read) explode on me before. It blew the door right off of the drive with one hell of a bang, scaring the crap out of me as my head was about 2 feet from the drive.
:)
The disk had shattered into thousands of tiny pieces. I was able to retrive about 75% of the disk, at which point I started re-assembling it like an NTSB investigation. Unfortunately, the janitors here at the office cleaned it up before I was able to get a picture of it.
Man, was the IT manager surprised when I told him why I needed a new CD drive...
Oh, and the disk? Microsoft ActiveSync 3.1 install disk.
though more dangerous because they tend to not shatter. Just spin one up, then lay it against a rail of some kind and watch it take off. It will curve slightly due to the Coriolis effect. But I've seen them stick into trees...
There may be some interesting chemical interactions between the plastic and the freon, which could be a solvent to the plastic.
Without further study, I am ill-prepared to advise you on what you will get. But there's no telling what might come of it.
I think you are wise in your advice to not breathe the fumes. I have no idea what hydrocarbons and halogen derivatives may be formed, but I do know some of our most toxic materials are formed from malformed organic molecules, which trick our biological organic synthesis systems into doing things they are not supposed to do.
"Prove all things; hold fast that which is good." [KJV: I Thessalonians 5:21]
I was working in Honolulu for a civil engineering firm. I was hired as a technical writer, but once they learned how much I knew about computers and networking, they put me to work doing that whenever they needed it.
One day, I was pulling cable. I was stuck headfirst in the crawlspace, teetering on the top of a ladder, negotiating with some recalcitrant CAT5, when I heard what sounded like a gunshot come from one of the engineers offices. I nearly fell off the ladder.
Running into the office, I found the engineer picking pieces of CD out of the wall opposite his computer. Turns out, he'd heard me raving about Linux and decided to give it a try. He'd bought a soft-cover Linux book with a CD in it. I think the CD might have been damaged by the flexing of the book.
When the CD spun up in his new 48x drive, it exploded: shards shot 10 feet out the front and embeded themselves in the drywall. Upon opening up the case, we could see that the drive innards were completely mangled.
I told him not to give up on Linux, but maybe he should buy a boxed set.
- None can love freedom heartily, but good men; the rest love not freedom, but license. -- John Milton
Note from the article, that the observers didn't put on glasses until the first disk had shattered against the ceiling.
I also notice that the glasses he's shown wearing sure don't look like side-shield safety glasses to me.
My shop teacher would have kicked my ass for this kind of stunt.
-jcr
The only title of honor that a tyrant can grant is "Enemy of the State."
I remember a web site about a guy in Sweden or Denmark or someplace doing the same thing only under more controlled conditions and he actually tried to reinforce the CD's with kevlar and stuff. He tested several different kinds to see at what speed they would shatter. Really interesting news 4 fucking years ago. The link was probably on SlashDot, too, but I can't remember where because it was so long ago. Another Slashdot rerun.
According to some quick research, the typical moment of inertia for a compact disc is 27 000 g mm^2 = 2.7 x 10^-5 kg m^2. (A CD-R might have a little more mass than a typical CD.) If it were to really get up to the rated 35 000 rpm = 3700 rad/s, that would give the spinning CD an angular momentum of 0.10 kg m^2/s and a total rotational kinetic energy of about 180 J. By comparison, the (translational) kinetic energy of a 95 mph fastball is about 130 J.
Just to set the record straight:
Silly Putty
silly Puddy
I bought plextor just because it comes with plextools with which you can slow down the drive to 8x CLV (or CAV, can't remember now). ok so it isn't 4x but 8x doesn't make much sound either.
Preserve old classics: copy your collection onto all hard drives.
huh? do not get what you mean. in english please.
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Karma 50, and all I got was this lousy T-Shirt.
Is there something special you want to point out? Scroll back to parent and read my original posts. I said (with more words) it would be coincidence if the light of a "normal" scanner not designed for CD's would match the one needed for a CD. As the very original was obviously not aware that wavelengths do matter when reading a CD.
Neither have I said that such special scanner exists or does not, nor did I analyze if such a technology could work in principle or not.
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Karma 50, and all I got was this lousy T-Shirt.
At 172x how many RIAA CD burners is it equivalent to?