Thread-Milling Machine

The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.

Thread-Milling Machine

 

a metalcutting machine designed to cut external and internal thread by means of a thread cutter. The blank and thread cutter perform several motions as the thread is formed on a thread-milling machine. The thread cutter rotates about its axis (principal motion); the blank slowly rotates (circular feed); the blank or thread cutter moves longitudinally (traverse feed, which is equal to the pitch of the thread being cut per rotation of the blank); and the thread cutter penetrates to the depth of the thread (radial feed).

Semiautomatic and automatic thread-milling machines cut external and internal threads with a coarse screw pitch over a considerable distance by means of face and side cutters. They are also used to cut threads with a fine screw pitch over a short distance by means of hobbing cutters, the screw pitch equaling the pitch of the thread being cut during 1.25–1.5 rotations of the blank.

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.
References in periodicals archive ?
Holroyd dates back to the 1860s around the knitting mills of Manchester and has been making thread-milling machines at its present site for 110 years, adapting them for screw-type helical rotors in the 1960s.