Tapping

Tapping is a machining process that uses a multipoint cutting tool (tap) to produce uniform, internal, helical threads.  Either the tap or the workpiece is rotated and advanced relative to the other.  A hole with a diameter slightly smaller than the major diameter of the thread must already exist.

Process Characteristics

Produces internal helical threads
Requires an appropriate size hole in the workpiece prior to being tapped
Uses an accurate multipoint cutting tool
Tool lubrication is essential
Produces small chips

 

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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.