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Building Firearms by Hoffman Harold

By Hoffman Harold

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When the color reaches the dark blue move the tip of the flame down the spring. The reason for going to dark blue a moving it down the spring is that as you move it down it goes to the light blue-gray. If you hold it on the spring till it turned alight blue and moved it, you would go to the next level of hardness and the spring would be too soft. I have found it wise to repeat the process twice, as when I have done this I have almost eliminated spring breakage. Once the springs are tempered you will need to fit the springs to the action, and drill and tap the frame to fasten the springs in place.

5 percent tin, 6 percent Lead, and 7 percent zinc. The pouring temperature range for this alloy is 1950 degrees Fahrenheit for very heavy sections, to 2250 degrees Fahrenheit for very thin sections. Generally, 2150 degrees Fahrenheit can be considered as an average pouring temperature. Using leaded yellow brass requires gating similar to that used for red brass, with the exception that the sprue, gates, and runners must be somewhat larger. We must fill the mold cavity as rapidly as possible. If filled too slowly, the zinc in the alloy will produce a wormy surface on the casting.

SET UP THE DRAG The drag is the half of the flask used for the bottom half of the mold. Select either half of the flask for this purpose. In either case, place the drag down on the moldboard and over the pattern with the pins or the sockets down. POURING THE MOLD The actual pouring of molten metal into molds is a very important phase of the casting operation. More castings are lost due to faulty pouring than to any other single cause. Some basic rules for gravity casting a mold poured from a crucible or ladle is: 1.

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