Re: Awesome Quarter Shrinking Capacitors --> Manhole Shrinker

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: Yurtle Turtle <yurtle_t-at-yahoo-dot-com> 

While I'm pretty sure everyone's joking about
shrinking a manhole lid, I thought I'd point out that
most coins I've shrunk are made from fairly ductile
metals. The exception may be the zinc penny seen here:

http://www.hot-streamer-dot-com/adam/temp/penny.jpg

Most manhole lids are cast iron, which is fairly
brittle. You'd probably get something more like my
penny as opposed to actually shrinking it, but give it
a try!

I've had mixed results with a variety of foreign
money, but the penny is the only one that was actually
ripped apart. I may try again at lower power. I
haven't tried anything ferrous though. I've got some
old steel pennies I may try.

Adam

--- Tesla list <tesla-at-pupman-dot-com> wrote:
 > Original poster: Tesla729-at-cs-dot-com
 >
 > In a message dated 10/4/03 7:44:36 PM Pacific
 > Daylight Time,
 > tesla-at-pupman-dot-com writes:
 >
 > < Haven't actualy tried it yet, still a work in
 > progress. Plan to have a HV
 > < website soon. Anyone know where I can get a
 > manhole cover without the city
 > < complaining or have an idea on how to hold it
 > still? The usual wooden dowels
 > < that work with quarters no longer apply obviously
 > and this thing at full
 > < power would probably launch 100# slab of metal
 > over 100 feet in the air
 > < (that would hurt coming down).
 >
 > >Hi,
 > >
 > >The City of vail Colorado has very fancy manhole
 > covers and they sell them
 > >to the public in an effort to keep people from
 > steeling the ones on the
 > >street.
 > >
 >
 >http://www.ownapieceofvail-dot-com/Manhole/m_overview.html
 > >
 > >They are cast iron and wiegh 52 pounds but they now
 > have a small one which
 > >might be perfect.  The little ones go for $65 ($300
 > for the big ones) but
 > >maybe it would be worth a lot more crushed :o))
 > >
 > >Cheers,
 > >
 > >          Terry
 >
 >
 > Hi all,
 >
 > One thing that you would also need to consider
 > before trying to
 > shrink "manhole covers" is that cast iron is
 > considerably less
 > conductive than copper or aluminum and higher
 > conductive me-
 > tals are the best candidates for
 > "shrinking/crushing". I've done
 > a little quarter shrinking (quite dangerous
 > ballistic energies re-
 > leased in the process) and a lot of soda pop can
 > crushing (still
 > dangerous but less so than the quarter shrinking.
 > Anyway,
 > quarters shrink down to less than dime size in
 > diameter from
 > 10 kJ discharge and aluminum soda pop cans are
 > practically
 > shreaded. However, nickels and pennies are almost
 > unaffected
 > by a 10 kJ discharge (10 kJ is my limit w/ (2) 10
 > kV, 100 uFD
 > caps). Also, the steel cans, like Campbell's soup
 > cans, are
 > affected very little from a single 10 kJ discharge
 > but will begin
 > to deform after several repeated 10 kJ discharges.
 >
 > The bottom line is it would probably take a cap bank
 > of mag-
 > nitudes similar to the one at:
 >
 > http://www.hot-streamer-dot-com/adam/60_MJ_cap_bank.jpg
 >
 > that Adam shared with us to actaully shrink 100 lb.
 > cast
 > iron man hole covers. List member Bert Hickman has
 > done a lot of research into coin shrinking/ can
 > crushing
 > and has an excellent webpage about it at:
 >
 > http://205.243.100.155/frames/shrinkergallery.html
 >
 > As matter of safety, I would read and heed Bert's
 > safety precautions regarding this as it deals with
 > very high pulsed levels of electrical energy that
 > can mame and kill from mechanical injury as well
 > as the obvious electrocution hazard.
 >
 > David Rieben
 >
 >


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