11-01-2007, 07:17 PM
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#21 | | Senior Member
Join Date: Sep 2007 Location: New Hamphire
Posts: 397
| Good combination of the two. | 
|  | | And now for this message... |
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11-01-2007, 07:42 PM
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#22 | | Senior Member
Join Date: Jul 2005 Location: ??FC ~)---------- San Francisco, CA
Posts: 2,291
| Quote:
Originally Posted by App13  Constant vacuum, pulling the hot air out. That however is just a theory. I decided I needed an effective cooling system after my casing started to melt... I asked my physical science teacher and he said that CERN cooled theirs with vacuums. | I dont think that's right. I would imagine CERN cools their super-conducting magnets with liquid Nitrogen or liquid Helium, depending on how cold they have to get them (liquid Helium is lower temp than Nitrogen). This is the most common way to cool things to very low temps.
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11-01-2007, 07:50 PM
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#23 | | Senior Member
Join Date: Mar 2000 Location: Tucson, AZ
Posts: 124
| I would definitely focus on ways to cool your system rather than ways to create a vacuum chamber. Might I suggest fans? They work amazingly well and we use them or a circulating loop with a water chiller for moderate cooling and liquid nitrogen for more serious cooling.
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11-01-2007, 08:07 PM
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#24 | | Senior Member
Join Date: Sep 2007 Location: New Hamphire
Posts: 397
| Yeah I'm thinking that a vacuum chamber will be a project for another day. As for cooling I tried fans to avail. Know anywhere a 14 year old can get liquid nitrogen? Ha. | |
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11-01-2007, 09:06 PM
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#25 | | Boom!
Join Date: Oct 2004 Location: Canada
Posts: 5,925
| Quote:
Originally Posted by App13 Yeah I'm thinking that a vacuum chamber will be a project for another day. As for cooling I tried fans to avail. Know anywhere a 14 year old can get liquid nitrogen? Ha. | But what exactly happened? You mentioned that the casing melted - where's the heat coming from? If you're dumping that much current into those coils, it may be that you need some sort of automated control that fires your magnets for you and keeps the time that they're active to a minimum.
There are stepper motors out there that are stronger than any four of us put together, and they don't get that hot when they're running.
What kind of core are you using for your electromagnets? A regular iron nail?
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11-01-2007, 09:13 PM
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#26 | | Senior Member
Join Date: Sep 2007 Location: New Hamphire
Posts: 397
| I guese its the wireing, there must be a short. For the core I am using iron rods, bit more burly then iron nails.
[EDIT]
After some tweaking I found that I could cut the power by almost 90%... using 1 lantern battery instead of 10. The wire I was using was not ment to carry such a current and started to melt the pvc ring.
Last edited by App13; 11-01-2007 at 09:20 PM.
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11-01-2007, 09:29 PM
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#27 | | Senior Member
Join Date: May 2007 Location: SF bay area (ca-USA)
Posts: 360
| OK are these DC electromagnets? What is their resistance and your drive current? Calculate your power dissipation P=I*I*R (in amps and ohms please) the result P is in Watts.
I don't think that a vacuum will help you cool your magnets, in fact you are removing the possibility to conduct heat away. In a vacuum you can only radiate heat. A lot of military stuff will use high pressure dry nitrogen to increase thermal conductivity. Not practical for you to pursue this.
Try:
Fans < this should be enough
Dry Ice (you can buy it pretty easily, some grocery stores can get it for you.) but now you have water condensation on electronic parts.
Wind your magnets over copper tubing and circulate air or water through the tube.
Immerse the magnets in oil and circulate the oil through a radiator.
Are you modeling a linear accelerator or a cyclotron or...? http://en.wikipedia.org/wiki/Image:L...tronMagnet.jpg
__________________ entia non sunt multiplicanda praeter necessitatem "a braggart, a rogue, a villaine that fights by the book of arithmatick. Why the dev'l came you betweene us?.." | |
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11-01-2007, 10:10 PM
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#28 | | Senior Member
Join Date: Mar 2007 Location: Dere middle of Vermont
Posts: 3,701
| Quote:
Originally Posted by App13 Know anywhere a 14 year old can get liquid nitrogen? | We've got a 50 gallon tank of it in our barn for freezing semen.
Depends on if you're willing to make a trip up to Vermont to get
it, though... 
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11-01-2007, 10:32 PM
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#29 | | Senior Member
Join Date: Sep 2007 Location: New Hamphire
Posts: 397
| Quote:
Originally Posted by the ancient one OK are these DC electromagnets? What is their resistance and your drive current? Calculate your power dissipation P=I*I*R (in amps and ohms please) the result P is in Watts.
I don't think that a vacuum will help you cool your magnets, in fact you are removing the possibility to conduct heat away. In a vacuum you can only radiate heat. A lot of military stuff will use high pressure dry nitrogen to increase thermal conductivity. Not practical for you to pursue this.
Try:
Fans < this should be enough
Dry Ice (you can buy it pretty easily, some grocery stores can get it for you.) but now you have water condensation on electronic parts.
Wind your magnets over copper tubing and circulate air or water through the tube.
Immerse the magnets in oil and circulate the oil through a radiator.
Are you modeling a linear accelerator or a cyclotron or...? http://en.wikipedia.org/wiki/Image:L...tronMagnet.jpg | Cyclotron, and cooling is no longer a problem. Unless I decide to actually build a particle accelerator I won't need cooling. Quote:
Originally Posted by the maple epee We've got a 50 gallon tank of it in our barn for freezing semen.
Depends on if you're willing to make a trip up to Vermont to get
it, though... | A very good offer...  | |
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11-02-2007, 01:46 AM
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#30 | | Senior Member
Join Date: Jul 2005 Location: ??FC ~)---------- San Francisco, CA
Posts: 2,291
| Quote:
Originally Posted by the maple epee We've got a 50 gallon tank of it in our barn for freezing semen... | That's quite a peculiar hobby you got there.
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11-02-2007, 09:26 AM
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#31 | | Senior Member
Join Date: May 2005 Location: Over there -->
Posts: 3,873
| Quote:
Originally Posted by OROD That's quite a peculiar hobby you got there.
. | Ya never know when ya might need the extra!  | |
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11-02-2007, 10:01 AM
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#32 | | Senior Member
Join Date: Oct 2006 Location: Live in Maine...Fence in New Hampshire
Posts: 1,280
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Originally Posted by OROD That's quite a peculiar hobby you got there.
. | Maple believes that every drop of wasted semen is a sin. And he's planning on taking over the world by replicating himself 300 million times. | |
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11-02-2007, 07:25 PM
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#33 | | Senior Member
Join Date: Mar 2006 Location: my fencing club
Posts: 877
| what if you created a pseudo-vacuum by doing the finger-over-a-straw-in-a-glass-of-water trick? i think (but im not sure) that that is some sort of vacuum. don't know how exactly that would work but i sure isn't plain old air in there, right?
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11-02-2007, 07:34 PM
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#34 | | Senior Member
Join Date: Sep 2007 Location: New Hamphire
Posts: 397
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Originally Posted by Beloit Fencer of Old Maple believes that every drop of wasted semen is a sin. And he's planning on taking over the world by replicating himself 300 million times. | Darnit... *X's out file that says 'How to Take Ova the Wurld'* | |
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11-03-2007, 12:06 AM
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#35 | | Senior Member
Join Date: Mar 2005
Posts: 1,048
| 300 million is overkill, anyways.
You just need to clone yourself a mere 300 times, have your clones ingratiate themselves into the leaders of the 200 largest countries (assuming a 1/3 failure rate), and on cue assassinate the leaders and take over. And their all answerable to you (courtesy of genetic engineering and implanted remote-control cyanide capsules).
Maybe I've said too much...
__________________ The preceding post brought to you by Rabid Monk (TM).
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11-03-2007, 09:40 AM
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#36 | | Senior Member
Join Date: May 2005 Location: Over there -->
Posts: 3,873
| Quote:
Originally Posted by Rabid Monk 300 million is overkill, anyways.
You just need to clone yourself a mere 300 times, have your clones ingratiate themselves into the leaders of the 200 largest countries (assuming a 1/3 failure rate), and on cue assassinate the leaders and take over. And their all answerable to you (courtesy of genetic engineering and implanted remote-control cyanide capsules).
Maybe I've said too much... | You seem to have devoted much thought to this...  | |
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11-03-2007, 09:58 AM
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#37 | | Senior Member
Join Date: Jun 2007 Location: Michigan
Posts: 2,457
| 
I still like the painted balls
I don't even know what an accellorater is
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11-05-2007, 07:09 AM
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#38 | | Senior Member
Join Date: Mar 2007 Location: Dere middle of Vermont
Posts: 3,701
| Bull semen... 
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11-06-2007, 05:13 PM
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#39 | | Senior Member
Join Date: Mar 2005
Posts: 1,048
| Quote:
Originally Posted by the maple epee Bull semen... | And just how, exactly, do you collect that?
No...wait...on second though, don't answer. I really don't want to know.
__________________ The preceding post brought to you by Rabid Monk (TM).
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11-06-2007, 08:05 PM
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#40 | | Senior Member
Join Date: May 2005 Location: Over there -->
Posts: 3,873
| He's explained it before in the 516K thread. | |
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