![]() You can sandcast with solid mould cores, then split the drag and cope apart to fish the cores out when the green sand has set. This may not be directly relevant to melting metal, but it sure demonstrated the possibility for surprises. But however it managed to do so, it certainly reached the temperature where glass becomes a susceptor, and was then absorbing microwaves directly. ![]() I suspect the thinner and layered Corelle may have been acting in combination with the (metal?) sprocket as a capacitor, initially undergoing dielectric heating though I’m not certain about this part. I soon found the plate glowing red hot around the contact point. Once I balanced a Corelle plate directly on the sprocket that normally drives the glass turntable, since the turntable was in the dishwasher. There may be other unexpected issues too. (This includes the microwave’s housing.)Ģ) Melting of thin metal pieces, leading to #1.įlames/arcs, especially if seeded with metal vapor, are strong microwave absorbers and lead to unintended fiery effects. Posted in 3d Printer hacks Tagged 3d printing, aluminum, casting, lost PLA, lost wax, microwave, molding, sprue Post navigationġ) Any situation where there are two pieces of a metal separated by an air gap, small enough that the induced voltage can arc across it. Until metal 3D printing becomes cheap enough for everyone to do at home, this will work pretty well. Sometimes you really need a metal piece, though. We think this is a heck of a lot of work for a single part. When the metal cools, the mold is broken away to reveal a part ready to be machined. The entire mold is cooked in an unmodified household microwave to burn out the PLA.Ī second microwave with a top emitter is used to melt down aluminum, which is then poured into the prepared mold. The part is then placed in a mold made of plaster of paris and perlite. A part printed in PLA is coated with susceptor. After trying several materials, settled on a mixture of silicon carbide, sugar, water, and alcohol for their susceptor. If you’ve ever nuked a hot pocket, the crisping sleeve is lined with susceptor material. Susceptors convert the microwave’s RF energy into thermal energy exactly where it is needed. ![]() have moved the entire process over to a pair of microwaves.īuilding on the work of the FOSScar project, the pair needed a way to burn the PLA out of a mold with a microwave. We’ve covered lost PLA before, but it always involved forges. Have been perfecting their microwave-based lost PLA casting technique over at Hackaday.io. As the name implies, lost PLA is similar to lost wax casting techniques.
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