Drill Bit Classification by Design and Use
Drill Bit Classification organizes tools by geometry, material, shank, workpiece, and machining purpose. Understanding these groups helps users choose a bit that produces accurate holes, controls chips, and delivers reliable tool life.
Table of Contents
Twist drills are the most common choice for general holes, while step drills enlarge thin sheet efficiently. Center drills start accurate locations, spotting drills prevent wandering, and flat or spade drills create larger holes. Gun drills and deep-hole drills use specialized geometry and coolant delivery for long, straight bores.
High speed steel offers toughness and economy, carbide supports higher speed and wear resistance, and coated grades reduce friction and heat. Match point angle, flute length, diameter, shank, coolant, feed, and speed to the workpiece. A reliable cutting tool manufacturer can recommend a design; review drill bit fundamentals for comparison.
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