Mark Serbu, a gun designer, details the complex machining process for the BFG-50A trunnion, a critical component housing the serial number and barrel extension. He discusses challenges with tapping hardened alloy steel, including tap breakage, and the successful implementation of using a larger drill size with molybdenum disulfide grease. The video also covers thread milling techniques for various holes, including the gas cylinder boss, and highlights the importance of precise tolerances for accuracy.
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