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Registered Member #10
Joined: Thu Feb 02 2006, 09:45AM
Location: Bunbury, Australia
Posts: 1424
It's been a while since I did any of this can crushing stuff. I normally do damage to cans using 3 turns of solid rectangular copper wire which with pulse caps is enough to tear the can in half with 2kJ. At 4kj you can crush 2 cans together or a frozen can into spiral strips or a steel can. Lots of permutations. I was doing my junkyard rounds the other day and came across this coil. It has 15 turns of 15 x 6mm aluminium wire welded to solid but damaged connectors. It fits a can inside nicely. It is possible (not yet tried) to run my cap bank at 12kV. This should have enough voltage to work with the 12 turns. The good thing about this coil is that the field inside will be much more uniform and the can can't escape by tearing in half. One downside is that it is not a copper coil and the upright wire cross section is not as close to the coil. Nevertheless there will be a significant field induced in there and it will be good to get objective measurements of it even if the pulse is stretched. Maybe I can levitate a frog for a few milliseconds.
Registered Member #195
Joined: Fri Feb 17 2006, 08:27PM
Location: Berkeley, ca.
Posts: 1111
if you use one of those monster pulse caps will the coil blow up aruond the can? I work at a place that does pulse power and i was told that they had a mega joule bank and they used to put cans in a 3 foot inductor and shot them into the sealing.
Registered Member #10
Joined: Thu Feb 02 2006, 09:45AM
Location: Bunbury, Australia
Posts: 1424
The coil probably won't explode given the expected currents which might only reach 30kA with this number of turns although the field will be high. Shooting cans in the air takes only 2kJ to get 15 feet. Using a 3 foot inductor is impressive though. Any details on the megajoule bank?
Registered Member #10
Joined: Thu Feb 02 2006, 09:45AM
Location: Bunbury, Australia
Posts: 1424
Lots of industrial type electrical stuff at this junkyard. All sort of inexplicable heavy duty stuff like big wierd transfomers, big control cabinets etc This one had a strange spiral winding inside as well. There was another one which was damaged. I should have got it too to use a smaller section.
I've not yet used it. Many projects on the go at present. I would like to crush a can into drinking straw dimensions. That would be cool.
I remote trigger with a long string. You may well ask how long...
Registered Member #311
Joined: Sun Mar 12 2006, 08:28PM
Location:
Posts: 253
As there appears to be no support between the flat turns, hitting this coil with a pulse discharge will probably make it collapse along its axis rather violently - this effect can be seen in this high-speed video sequence :
Registered Member #10
Joined: Thu Feb 02 2006, 09:45AM
Location: Bunbury, Australia
Posts: 1424
The tape around the windings 180 degrees apart covers a phenolic block between each winding. This still leaves no support between each half turn so axial compression may still be a problem. I can either support them each 90 degrees with 30 blocks or fill the gaps with epoxy/silicone. If I do that then I lose the heat sinking properties. I suspect it won't be a problem up to 100kA going on past experience of rectangular copper wire.
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Can crushing, the next generation?
