"Tom Miller" wrote in message
...

"Mike Fields" wrote in message
...

wrote in message
oups.com...
yesterday I had some spare time:

piece of plywood
skateboard "truck" (axle, axle mount, bearings, wheel=hub)
7 Compact disks
10 bolts + nuts
16 washers

4 bolts +nuts for holding the truck to the plywood

stacked CD's, cut 4 holes on outer edge (for bolts, to hold CD's
together)
2 holes on inner edge (connection to hub)
5 CD's need their inner hold widened.

put it together. blew on it with the compressor.
approx 4000 RPM

Ok, it wobbles. badly.

today, I went ahead and remade the CD's,
drilling them closer to precise.

approx 8000 RPM

12V no load (with a 6volt motor)
6V with load, 2amps output.

So, I decided to add ONE nozzle:
1/8" inner diameter aluminum tubing
2X4 wood supports

approx 10,000 RPM
8volts, 2 amps loaded

To quote Elmer Fudd -- "be vewy vewy careful" -- there have
been a number of reports of some of the CD's exploding in some
of the high speed CD drives and doing a fair amount of damage.
10,000 is starting to get up there. (of course they were saying the
Formula 1 cars are turning 18,000 on a V-10 engine -- that can
really come apart in a hurry !!

mikey


Didn't "Mythbusters", the TV program do a storey on exploding CD's?


Don't remember that one, but there have been a number of people
in the cdr newsgroups who say they have had it happen to them.
Only happens in the high speed drives and if the disc has a crack
(even a small one) in it already. I have not seen it personally, but
there were a number that said it happened to them (as opposed to
"I have heard of it"). Apparently does a fairly good job of destroying
the drive when it happens ...

mikey