By Harold Hoffman
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Extra info for Building Firearms
Pour on the hot side, more castings are lost by pouring too cold rather than too hot. 6. Once a pour is started, do not reduce the stream of metal. 7. Do not dribble metal into the mold or interrupt the stream of metal. 36 BUILDING FIREARMS 8. If a mold cracks and the metal starts to run out, don't try to save it. 9. If a mold starts to spit metal from the pouring basin or vents, stop pouring. 10. Wear a face shield and leggings. 11. When pouring several molds in a row with a hand shank, start at one end and backup as you go.
We now adjust the casting machine to receive the flask. Place the invested flask into the burnout oven, with the sprue opening down. Close the door of the oven and turn on the switch, Normally, the burnout sequence takes about one hour. This is dependent on the wattage rating of the oven and the number of flasks being burned out at one time. If your oven is equipped with a pyrometer, it is a simple matter to gradually bring the temperature to 1200 degrees. Hold the temperature at 1200 degrees for ten to twenty minutes.
Since water must not affect the patterns, I usually made them out of metal (Aluminum) when I had several parts to make. There is a metal casting plaster available, which can be made permeable by whipping or mixing small air bubbles into the slurry with the use of a rapidly rotating, partially submerged disk or blade. Many small air bubbles thus formed become interconnected when the mold is dried, providing sufficient permeability. 005 inch. 002 inch per inch on larger dimensions. 5 inch, we usually require more across the parting line.