By Hoffman Harold
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T. pipe thread. To this piece affix a good adhesive such as silicone for automobile engine gaskets, three 39 BUILDING FIREARMS layers of sheet asbestos cut to size. This will seal the air pressure on the flask. We drill several holes in the up rights where we mount the lever. When you make the flasks, we should make them a certain height so the pressure plate will come down flat and seal it. The flasks for pressure castings can be from any suitable tubing strong enough to withstand the pressure.
Making the frame can be as simple as cutting out the parts, and then riveting or silver soldering them to together. If you plan to make more than one, by all means make a master pattern out of wood or aluminum to be used as a pattern for investment casting. ) should be completed first. Then cut out the frame pattern, leaving it flat for drilling the holes for the hammer and trigger. The holes for these can be drilled with number drills of the right size. Set the hammer and trigger in the proper place, (this may take a little time) clamp them place and drill the holes.
Molds are made of a special plaster CORES Cores, for holes and recesses, also can be made of the plaster composition. The size of the parts usually made in plasters molds ranges from a small fraction of an ounce to 10 lb. The plaster causes slower cooling of the casting than would occur in sand molds. This slowness has a tendency to improve the characteristics of bronze castings, but it is a disadvantage with aluminum, giving properties that are somewhat lower than those with sand or shell mold 30 BUILDING FIREARMS castings.
Building Firearms by Hoffman Harold
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