Building Firearms by Hoffman Harold

By Hoffman Harold

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Also, pressure casting, has an inherent safely factor, as there is little risk of spilling molten metal. They create the metal directly in the flask cavity, poured directly into the pressure machine and then forced into the mold by air pressure. Centrifugal casting requires that the molten metal revolve at high speed to attain the needed casting pressure. 38 BUILDING FIREARMS PRESSURE CASTING MACHINE The necessary pressure needed to get finished size castings, must be done by one of several methods.

4. Place these parts on the outside of the frame. The hammer and trigger pivot hole can be already drilled at their exact locations if you want. Otherwise, with the parts on the frame (start with the hammer) in the proper place, clamp the parts and drill a hole through the frame. Place a pin the correct size into the frame and place the hammer over it. You now have a hammer that will rotate as it would in use. 5. Next locate where the trigger should be and repeat the above step. Once the trigger and hammer are mounted on the frame, they can be hand fitted to work properly in relation to each other.

You will need several of these to fit the different sizes of flasks. We drill and tapped it for 1/8 N. 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.

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