Drilling

Drilling is a cutting process in which a hole is originated or enlarged by means of a multipoint, fluted, end cutting tool.  As the drill is rotated and advanced into the workpiece, material is removed in the form of chips that move along the fluted shank of the drill.  One study showed that drilling accounts for nearly 90% of all chips produced.

Process Characteristics

Uses a multipoint, fluted, end cutting tool (drill)
Cutting tools or workpieces are rotated and advanced relative to each other
Creates or enlarges nonprecision holes
May produce coarse, helical feed marks, depending on machining parameters (feed, speed, tool geometry, coolant, etc.)
Creates small burrs on entry and coarse burrs on exit.

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Information provided is from Manufacturing Processes Reference Guide by Robert H. Todd, Dell K. Allen, and Leo Alting.--1st ed. Published by Industrial Press Inc., 1994.