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Make Your Own GRBL CNC Pendant
How to make Machinable Wax at home!
"Once poured, cover the molds with a towel so that they cool slowly. The slower they cool, the more likely that air bubbles will escape before getting stuck in the wax."With that in mind, maybe you should try putting the molds in the oven. All that insulation has to be good.
This didn't work for me as described. At 300-330 deg F the shopping bags strips just melted into globs and even after an hour of stirring there were still globs of shopping bag floating around in the mix. I had much better success with ziploc bags (LDPE) but I never reached the point that they stopped "dissolving" it just finally got so thick that air bubbles wouldn't come to the surface. The one thing that did work well for me was my molds. I layed a sheet of aluminum foil on cardboard for the bottom and then wrapped aluminum foil around the strips of wood that made up the walls and clamped it all together. then covered it with cardboard and towels after pouring. this kept it well insulated for a slow cool but best of all is that instead of having a big sink in the middle it shrunk uniformly by pulling away from the walls. I haven't tried machining them yet but I'm fairly sure that there will be air bubbles exposed when I do which isn't going to be acceptable for my application which is to make polyurethane molds. Any comment or suggestions would be appreciated.
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