Building Firearms by Hoffman Harold

By Hoffman Harold

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49 BUILDING FIREARMS STEPS IN MAKING PARTS To be on the safe side in designing a firearm that will work right the first time you need to do the following. 1. Cut out the outline of the frame from aluminum and leave it flat as cut. From this main pattern you can fit all the parts, such as hammer, springs that has holes drilled through the frame. 2. Determine what the thickness will be on the hammer and trigger. 3. Cut out the hammer and trigger from either aluminum or steel. Finish out these parts as close as you can leave a little extra metal for final fitting.

Once the trigger and hammer are mounted on the frame, they can be hand fitted to work properly in relation to each other. 6. On the inside of the frame can be machined out to fit all the inside parts. Most of it can be machined out using end mills, but in the corners you will probably have to square it up with a file. 250 mill it would cut oversize. After the final milling is completed, move the end mill over a few thousands for a cleanup pass. 005 clearance when completed. 7. Take all the inside parts that you have made, and try them to be sure that they all fit, doing any final fitting on the frame that is necessary.

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. Hold the flask containing the pattern and vibrate the investment into the flask. The thumb of the left hand is in intimate contact with the vibrator. The thumb acts as a dampening device from vibrations transmitted to the flask and prevents breaking the sprue or wax pattern.

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