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September 19th, 2005 | #21 | |
The paranormal silent type
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General Motors research Chrysler research Ford research
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September 19th, 2005 | #22 | |
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September 20th, 2005 | #23 | |
The paranormal silent type
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September 24th, 2005 | #24 | |
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What's up with the white text? Laying some spider bait for the car companies? |
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September 24th, 2005 | #25 |
The paranormal silent type
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More likely to bait their employees, investors and those who would otherwise read an economic page- in a newspaper or weekly publication. They might want to browse the website on other issues.
Now that you mention it, one can see the white print . What color does one use to make the spiders invisible?
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Last edited by Kind Lampshade Maker; September 24th, 2005 at 01:29 PM. |
September 24th, 2005 | #26 | |
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Al is a lot easier to do starting out in the backyard than trying iron straight away. Al only needs temperatures up to 1350 F to melt, and much simpler home made foundry equipment. Iron needs to reach 3000F, usually in a cupola. Go here if your really serious on following this up. http://stephenchastain.com/store.htm This mechanical engineer has written several practical books on home foundry work. Order both "Sand Casting Manuals", I & II, and also the "Iron Melting Cupola Furnace". "Oil Fired Tilting Furnace" is optional. I have all four books and highly recommend them as worthwhile investments. Also go here: http://lindsaybks.com/ and request a paper catalog first. Most of their inventory isn't listed online, FYI. You'll be amazed at the range of books they offer in small scaled technology. "Maguire" |
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September 25th, 2005 | #27 | |
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Iron's heat of fusion is 13.81 kilojoules per mole. Aluminum's heat of fusion is 10.71 Kj/Mol. Iron melts at 2800 F Aluminum melts at 1221 F Iron has nearly 3x aluminum's density. Meaning you need three times the volume of metal for equally sized parts. This is what made aluminum so popular in aircraft. Then factor in energy losses due to foundry efficiencies which run from 1% to maybe 35% for a Siemans' reverberatory furnace. Wrap it all up and you need about 10x the BTUs to cast the same size part in iron than in aluminum. You can melt aluminum in a home made steel pipe crucible, using grocery store charcoal in a crude foundry. The small scale foundrymen are unanimous on this point. Start with aluminum first and gain some competence before stepping up to iron. The equipment needed to melt and pour iron is more elaborate, but still doable on a very small scale. The skill requirement is far higher. You'll need clay graphite or silicon carbide crucibles, propane or oil fuel for a fuel source, good burners, a strong blower and also a good foundry refractory design. And preferably a small cupola furnace fired with coal coke or very high quality hardwood charcoal. i.e. forget the grocery store stuff. Aluminum is softer than iron and easier to work with hand tools or machine tools. Are you referring to these softer working characterisitics as being 'difficult' just because it clogs up regular files or because saw-cut parts have to be dressed? |
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January 27th, 2009 | #28 | |
The paranormal silent type
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http://www.p2pays.org/ref/01/text/00778/chapter4.htm
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