Metal Casting Zone Info Blog

jemrx2 asked:


I’ve probably spent too much time staring at the glowing little egg and breathing too many fumes, but for years now I ve melted gold in some old pottery crucibles. Ive had some luck with sticking the tip of a stainless steakknife in the molten gold and slowly sifting-out little pieces of metal that aren’t quite in a liquid state. This process I use also is to set up a piece of pottery so it’s directly above a cast iron skillet full of distilled water. Once the molten gold is ‘clear’ (actually looks like yellowish mercury) I get to a point where I take some big pliers and spill the molten blob right into the water. If I could control the spill so that it cools while it’s still going down in the water, wouldn’t the bottom part be heavier and thus of purer form? If I grind this piece of alloy with a course file into little shavings would that help help before using nit/acid? I’ve got some merc, too, but I’d like to find a way that’s chem-free and just uses gravity. Or melting temps.

Metal Casting DIY

rgp53 asked:


i want to sell my scrap metal to a scrap yard. i am not sure if it is aliminum or cast metal of a different type. is there a test to determine the differnt types of metals? i know you can use a magnet to determine if ferrous or non-ferrous

Back Yard Metal Casting

fieroturbo asked:


I’m not a metalurgist by any means, so bear with me.

I know hydrogen has a tendancy to migrate through metal and make it brittle. Would this still occur on ceramic coated metal, or maybe even cryo-treated metal?

The metal in question by the way is cast aluminum.

Brass Metal Casting

dalton asked:


I’ve seen a round concrete with more or less 4 meters in diameter and about 18 inches thick broken into 3 from a foot of a mountain. Visible from one piece are 7 empty casts probably from gold bars and 2 empty cast contained probably metal box measuring 6 x 6 x 12 inches. We thought a chemical was used to break the concrete.
Now, a friend found a niche down a river. It appeared after an erosion due to a flood. It’s so hard to break. Anyone here knows what kind of chem is that used to soften concrete?

Iron Metal Casting

cndags asked:


is there any substance or composition that i can use to substitute to our steel mould making process to avoid machining steel to make rubber vulcanization moulds? instead, i could make these moulds in the for of casting them to produce te mould? i would like to find any substitiute for metal, which has high thermal conductivity and can withstand the pressure for vulcanization without breaking. this would help me produce custom made moulds for custom jobs, instead of spending time in machining steel to make a mould for a part… i was thinking something like, having it in liquid form like cement, then just pour it into a part, to produce a negative/ cavity… then when it solidifies, i just pull out the part… then use the mould to produce or vulcanize a almost replica part… or at least, lessen the machining for it… that would make our product development faster…. any help guys? need high thermal conductivity or at least same as steel… that’s the most important factor….

Casting Furnace

bud asked:


I noticed in a junk yard that the engine castings, and brake rotors just showed surface rust and can be machined. Sheet metal parts where rusted through. Also I heard that cast iron filings are good for the garden, not steel filings. Is this true?
Thanks

Metal Casting Zone

cndags asked:


is there any substance or composition that i can use to substitute to our steel mould making process to avoid machining steel to make rubber vulcanization moulds? instead, i could make these moulds in the for of casting them to produce te mould? i would like to find any substitiute for metal, which has high thermal conductivity and can withstand the pressure for vulcanization without breaking. this would help me produce custom made moulds for custom jobs, instead of spending time in machining steel to make a mould for a part… i was thinking something like, having it in liquid form like cement, then just pour it into a part, to produce a negative/ cavity… then when it solidifies, i just pull out the part… then use the mould to produce or vulcanize a almost replica part… or at least, lessen the machining for it… that would make our product development faster…. any help guys? need high thermal conductivity or at least same as steel… that’s the most important factor….

Steel Metal Casting

bud asked:


I noticed in a junk yard that the engine castings, and brake rotors just showed surface rust and can be machined. Sheet metal parts where rusted through. Also I heard that cast iron filings are good for the garden, not steel filings. Is this true?
Thanks

Casting Furnace

jemrx2 asked:


I’ve probably spent too much time staring at the glowing little egg and breathing too many fumes, but for years now I ve melted gold in some old pottery crucibles. Ive had some luck with sticking the tip of a stainless steakknife in the molten gold and slowly sifting-out little pieces of metal that aren’t quite in a liquid state. This process I use also is to set up a piece of pottery so it’s directly above a cast iron skillet full of distilled water. Once the molten gold is ‘clear’ (actually looks like yellowish mercury) I get to a point where I take some big pliers and spill the molten blob right into the water. If I could control the spill so that it cools while it’s still going down in the water, wouldn’t the bottom part be heavier and thus of purer form? If I grind this piece of alloy with a course file into little shavings would that help help before using nit/acid? I’ve got some merc, too, but I’d like to find a way that’s chem-free and just uses gravity. Or melting temps.

Metal Casting

Lucas asked:


I need to cast some epoxy using a metal mould. I have some serious difficulties removing the epoxy once it has cured. I have tried coating the metal with silicone oil, hair spray and Teflon (PTFE) spray. Nothing has helped. What should I use to coat the metal surface in order to easily remove the cast epoxy part?

Metal Casting DIY