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Metalworking (rec.crafts.metalworking) Discuss various aspects of working with metal, such as machining, welding, metal joining, screwing, casting, hardening/tempering, blacksmithing/forging, spinning and hammer work, sheet metal work. |
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#1
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lost foam casting - follow up
flux and degasser
Two cheap tips for aluminum casting: (1) Use canning or rock salt as a flux when melting. It will float on top of the melt protecting the aluminum and if the charge is salvage metal it seems to cause the contaminates to separate so these can be skimmed or sink to the bottom. Learned this from watching an aluminum salvage operation. (2) For degasser, fill a piece of =BD inch black iron pipe about 4 inches long with swimming pool chlorine powder. (much cheaper than the tablets). Use a wad of aluminum foil or brown paper in each end of the pipe to keep the powder in. Use tongs to plunge the pipe to the bottom of your crucible and stir it around. Be careful not to breath the fumes! If you are getting porosity in your castings, check the pigs/ingots that you pour when the molds are full. If these are sound most likely the metal is too hot. Try painting the bottom and sides of your foam patterns with water glass (solution of sodium silicate) and let dry. Use plaster or sand to support the coated foam pattern. I can get very smooth surfaces this way. |
#2
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I want to say that the alum foundry I programmed for used potatoes for a
degasser. I do know that they put the potatoes in their melts for something. wrote in message ups.com... flux and degasser Two cheap tips for aluminum casting: (1) Use canning or rock salt as a flux when melting. It will float on top of the melt protecting the aluminum and if the charge is salvage metal it seems to cause the contaminates to separate so these can be skimmed or sink to the bottom. Learned this from watching an aluminum salvage operation. (2) For degasser, fill a piece of ½ inch black iron pipe about 4 inches long with swimming pool chlorine powder. (much cheaper than the tablets). Use a wad of aluminum foil or brown paper in each end of the pipe to keep the powder in. Use tongs to plunge the pipe to the bottom of your crucible and stir it around. Be careful not to breath the fumes! If you are getting porosity in your castings, check the pigs/ingots that you pour when the molds are full. If these are sound most likely the metal is too hot. Try painting the bottom and sides of your foam patterns with water glass (solution of sodium silicate) and let dry. Use plaster or sand to support the coated foam pattern. I can get very smooth surfaces this way. |
#3
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In article ,
"Tim Williams" wrote: [...] Morton Lite Salt (half the sodium of normal salt) That's officially the funniest thing I've heard of in a long time. I had to run out to the store just to see some for myself, and sure enough, there it was--unsalted salt. -- B.B. --I am not a goat! thegoat4 at airmail dot net http://web2.airmail.net/thegoat4/ |
#4
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"B.B." u wrote in message news In article , "Tim Williams" wrote: [...] Morton Lite Salt (half the sodium of normal salt) That's officially the funniest thing I've heard of in a long time. I had to run out to the store just to see some for myself, and sure enough, there it was--unsalted salt. Hey! Whaddabout "low-fat margarine"? Same schtick, different fork. -- Jeff R. |
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Jeff R. wrote:
"B.B." u wrote in message newsoNotSpamthegoat4- ... In article , "Tim Williams" wrote: [...] Morton Lite Salt (half the sodium of normal salt) That's officially the funniest thing I've heard of in a long time. I had to run out to the store just to see some for myself, and sure enough, there it was--unsalted salt. Hey! Whaddabout "low-fat margarine"? Same schtick, different fork. And 'no fat' sour cream? I *don't* want to know what's in that. -- http://www.rupert.net/~solar Return address supplied by 'spammotel' http://www.spammotel.com |
#6
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"Ken Davey" wrote in message
... Jeff R. wrote: "B.B." u wrote in message newsoNotSpamthegoat4- ... In article , "Tim Williams" wrote: [...] Morton Lite Salt (half the sodium of normal salt) That's officially the funniest thing I've heard of in a long time. I had to run out to the store just to see some for myself, and sure enough, there it was--unsalted salt. Hey! Whaddabout "low-fat margarine"? Same schtick, different fork. And 'no fat' sour cream? I *don't* want to know what's in that. Ask Gunner. He probably knows how to turn it into home-made C4, for use with primer caps made out of M&Ms and red pepper. Ed Huntress |
#7
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On Fri, 17 Dec 2004 21:41:24 -0600, "Ken Davey"
wrote: Jeff R. wrote: "B.B." u wrote in message newsoNotSpamthegoat4- ... In article , "Tim Williams" wrote: [...] Morton Lite Salt (half the sodium of normal salt) That's officially the funniest thing I've heard of in a long time. I had to run out to the store just to see some for myself, and sure enough, there it was--unsalted salt. Hey! Whaddabout "low-fat margarine"? Same schtick, different fork. And 'no fat' sour cream? I *don't* want to know what's in that. I spotted that the other day in one of our stores; but the one that got me was several years ago when I found "margarine flavored butter" Gerry :-)} London, Canada |
#8
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On Fri, 17 Dec 2004 22:56:55 -0500, "Ed Huntress"
wrote: "Ken Davey" wrote in message ... Jeff R. wrote: "B.B." u wrote in message newsoNotSpamthegoat4- ... In article , "Tim Williams" wrote: [...] Morton Lite Salt (half the sodium of normal salt) That's officially the funniest thing I've heard of in a long time. I had to run out to the store just to see some for myself, and sure enough, there it was--unsalted salt. Hey! Whaddabout "low-fat margarine"? Same schtick, different fork. ma And 'no fat' sour cream? I *don't* want to know what's in that. Ask Gunner. He probably knows how to turn it into home-made C4, for use with primer caps made out of M&Ms and red pepper. Ed Huntress Hummm how much lactose or glycerine can you get out of that sort of fat? The lactose may likely be suseptibal to nitrating (milk sugar) mannitol haxanitrate. Then there is casein nitrate.... Primers are very hard to make. Most of the simpler compounds require a bit of mercury or other metals to fulminate. If you are the nervy type..there is iodine and ammonia.... Gunner "To be civilized is to restrain the ability to commit mayhem. To be incapable of committing mayhem is not the mark of the civilized, merely the domesticated." - Trefor Thomas |
#9
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On Sat, 18 Dec 2004 01:15:04 -0500, Gerald Miller
calmly ranted: And 'no fat' sour cream? I *don't* want to know what's in that. I spotted that the other day in one of our stores; but the one that got me was several years ago when I found "margarine flavored butter" I was floored a few years ago when a TV ad for "Oil-free Oil of Olay" lotion came on. How dey do dat? ----------------------------------------------------------- -- This post conscientiously crafted from 100% Recycled Pixels -- http://diversify.com Websites: PHP Programming, MySQL databases ================================================== ================ |
#10
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Ken Davey wrote:
Jeff R. wrote: (snip) And 'no fat' sour cream? I *don't* want to know what's in that. Why? It's perfectly obvious, it's all Soy bean extract. :-) ...lew... |
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