metiz wrote:Holy aluminium casting, batman!
Try a vibrating surface plate to get rid of any airbubbles when casting. Also try preheating whatever you're casting in (is that a pie shape? ) so the aluminium solidifies more evenly.
Johansson wrote:Besides the things you´ve pointed out I should have guessed that the teflon coating in the pie shape would burn and cause cavities, but it was only a primary test and did indeed inspire us to make a more serious attempt later with an oil burning forge and better quality aluminum
hinote wrote:Be careful
At 680°F Teflon pans release at least six toxic gases, including two carcinogens, two global pollutants, and MFA, a chemical lethal to humans at low doses. At temperatures that DuPont scientists claim are reached on stovetop drip pans (1000°F), non-stick coatings break down to a chemical warfare agent known as PFIB, and a chemical analog of the WWII nerve gas phosgene.“
Johansson wrote:…make a more serious attempt later with an oil burning forge…
tufty wrote:Bet you wish you hadn't flattened that big pulsejet now, eh? Heat and vibration, all in one convenient & efficient package
tufty wrote:Johansson wrote:…make a more serious attempt later with an oil burning forge…
Bet you wish you hadn't flattened that big pulsejet now, eh? Heat and vibration, all in one convenient & efficient package
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