First Lost-Foam Casting

[Hopefuldave]

I dunno, took me weeks to work out what drywall mud was, and you blurt it out for all to see.... Mutter mutter...

Hawkeye, nice castings, nothing like bike parts to put a smile on my face
Did you vent the investment? I'm told McDonald's drinking straws are the very thing...

I've seen a few pages / youtubes where the foam's dissolved out with acetone and the investment's part-fired to clear the residue - looks interesting, but the smoke and flames aren't anywhere near as impressive...

Can't see why you shouldn't surround the investment with core mix (sand with sodium silicate / CO2) for support before dissolving and burning the foam residue? It should be a lot firmer than dry sand, tho the fluidised quicksand strikes me as genius!

I must give this a go - 50 gallon drum came my way at the weekend, and another with some gallons of waste engine oil... Shame the refractory costs so much At least I've already got the compressor and an old blower for the oil burner, high pressure propane regulator coming off ebay - just The Details to work out

Dave H. (the other one)