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Try special drills for special savings.
For many years, engineers sought improved twist-drill performance. In the quest, they developed solid-carbide drills, carbide tips, superabrasive inserts, powder-metal steel, new HSS alloys, and, most recently, titanium nitride (TiN) coatings. However, these new materials do not work alone. To yield longer tool life and better performance, they must be coupled with proper geometry and good tool design. Here are some cases where more expensive special tools proved to be cheaper in the long run because they cut overall production cost or did a better job. Often, we didn't even need the exotic new tool materials.
For example, Figure 1 shows an application where a standard drill...See the full content of this document
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