![]() Gun drills are specialized hole making tools designed to produce deep, straight, and accurate holes. Through existing process evaluation, the NCDMM determined that increased productivity and top quality could be achieved by applying advanced gun drilling methods. ![]() Prior to commencing production, Hamill asked the National Center for Defense Manufacturing and Machining NCDMM to suggest ways to reduce drilling time, meet required tolerances, and ensure consistent quality. ![]() Additionally, if even a single hole was drilled out of specification, the part would have to be scrapped and the process started over again. In that case, experience indicated that each component would require over 200 hours to produce. ![]() Hamill Manufacturing considered drilling and reaming the holes using the same parameters employed when drilling thinner Inconel work pieces. Hamill Manufacturing had experience drilling Inconel as thick as 2 inches, but the added depth, large number of holes, and close tolerances involved presented a new challenge. Abstract: Hamill Manufacturing Company, Trafford, Pennsylvania, was contracted to drill several hundred close-tolerance through-holes in an Inconel tube sheet component approximately 4 inches thick.
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