![]() ![]() The unique tool wear and failure modes are discussed in detail to provide insights into the underlying challenges, especially on the severe thermal-mechanical loading conditions. ![]() This chapter addresses the fundamental cause arising from a critical change in the generation of cutting force that induces adverse impacts on deflection of drills, burnishing along the hole and the eventual deterioration in straightness accuracy. However, such superiority diminishes while drilling nickel-based superalloys such as Inconel 718. Miniature deep holes with length to diameter ratios above 100 are commonly produced with mechanical gun drilling because of the efficiency of this process in meeting stringent straightness and finishing requirements.
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