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February 8, 2014, 10:16 AM | #26 | |
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Lead melts at about 650 degrees, wood burns at about 450 degrees. What am I missing? |
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February 8, 2014, 01:45 PM | #27 |
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drip,drip,drip,
I add more weight to the pour rod. With a few try's a small vice grip works for me.hdbiker
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February 8, 2014, 11:20 PM | #28 | |
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February 9, 2014, 12:57 AM | #29 |
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Recommended by some casting books and sites. Fluxes alloys back in some, doesn't stick to the alloy at all. Exposure time is minimal. Still using the same stick I started with. When stirring it just doesn't sit in the pot long enough to burn... much.
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February 9, 2014, 11:16 AM | #30 |
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CARBON! That's what does the reduction of tin, lead and and antimony oxides to the metallic state. Every substance we use as flux results in carbon being created to do the fluxing. Wood is the best for fluxing.
I've been using wood shavings for the last year to flux my lead. I gathered the sawdust from around my last construction project, but that didn't last too long. I got a bag of cedar shavings sold for pet bedding. That stuff smells good when it burns and works great for fluxing. You can light the smoke produced to make it burn, then stir the ash/carbon into your molten alloy. But here's what most are doing, don't skim the top of the melt. Leave the layer of ash/carbon on top to insulate the lead from the air, that prevents further oxidation. Yes, I do use a paint stirring stick , they made of pine and they char right up. Yeah, they can ignite and burn, just put them out. The charred surface is put where the carbon needs to be,,-- under the surface of the lead! The carbon should be in contact with all the lead to do the job of reducing the oxides to their metallic state.
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February 9, 2014, 01:23 PM | #31 | |
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February 9, 2014, 04:21 PM | #32 | |
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The more people I meet, the more I love my dog They're going to get their butts kicked over there this election. How come people can't spell and use words correctly? |
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February 9, 2014, 05:26 PM | #33 |
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Very strong +1 to snuffy. Pressure treated wood exposed to combustion temperatures releases PCB's and Dioxins which are HIGHLY (HIGHLY!!!!) toxic. They cause cumulative cirrhosis of the liver almost instantly and by the time you show symptoms significant permanent damage has already been done.
If by "treated" you mean like kiln dried milled 2x4's they are fine. DO NOT use the green pressure treated wood though. I can't stress this enough. Very very bad. The arsenic (which some pt wood no longer has) is the least of your concerns. Some pressure treated is brown too. But all the PT wood I've seen has a pattern of incision marks (probably to help treatment penetrate) and is a much darker color than non PT wood. BTW I use redwood sawdust for flux and would note that there are some woods that are naturally somewhat toxic when burned such as cypress. All wood smoke is a *little* toxic, but I would not use cypress sawdust for fluxing.
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