By Harold Hoffman
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Additional info for Building Firearms
The dry investment will tend to adhere to the mixing paddle of the vacuum mixer if not completely mixed and this can result in a distorted investment. We can vibrate the hand-mixed investment to dislodge air bubbles. The purpose of vacuum mixing or vibrating is to remove all air bubbles captured in the mixed investment. After casting, air bubbles against the pattern will appear as nodules of metal. We can usually remove these with pliers but sometimes they have become so firmly attach that we ruin an otherwise good casting.
The upper half has pegs that fit into these holes and ensure the exact matching of the two halves. After taking out the model, remove any surplus plaster from the mold, clean out the mouths of the two channels, and develop the upper opening of the pouring channel into a funnel shape. After a week of drying (we will not use heat on the first one), the mold is ready for use. It is sufficient to smear it lightly with soot before casting and to press both halves firmly together while pouring in the molten metal.
Shape out the spring with a file and grinder, smooth and polish it. Drill any holes that you need in it and then carefully bend it to the shape that you need. Be careful that you do not twist the spring. Now you can heat treat the spring. 50 BUILDING FIREARMS HEAT TREATING THE SPRING If the spring is small, it can be heat-treated with a butane torch, otherwise it must be done in a heat treat furnace. You will need some quenching oil, which can also be purchase from Brownells, otherwise use Olive Oil, or 5 to 10 weight machine oil.