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Understanding Thread Mills

A thread mill can be thought of as an end mill with the profile of the thread on the side. Using multiple axes of a CNC machine allows you to helically interpolate the thread profile into a work piece. Unlike a tap, a thread mill has a smaller diameter than the thread size being produced because the mill must be able to enter into the drilled hole and interpolate. Thread milling provides excellent control of the thread’s major diameter because it can be controlled using the machine’s cutter compensation.

THREAD MILLING REFERENCE GUIDE | 3