Evaluation of Coated Carbide Drill Bits for Drilling of Printed Wiring Board Materials: Final Report

摘要

Three carbide drill bits were evaluated to determine which ones produced the best hole quality in four types of copper-resin laminates. Titanium-nitride-coated and polycrystalline-diamond-tipped bits were compared with the carbide drill bits currently in use. The number of hits in epoxy-glass, polyimide-glass, polyimide-quartz, and polyimide-Kevlar were recorded. the diamond-tipped bit excelled in hole quality and longevity in all four materials; but considering the frequent necessity for changing drills, titanium-nitride-coated drills may be an effective compromise between cost and quality. (ERA citation 12:041584)