boring mill

American  

noun

1. Metalworking. a machine for boring large holes in heavy work, having a table on which the work rotates while the hole is bored vertically.

---

boring mill British  

noun

1. Also called (informal): roundabout.  engineering a large vertical lathe having a rotating table on which work is secured. Tools are held on a fixed post and the work is rotated around it

---

Etymology

Origin of boring mill

First recorded in 1825–35

Example Sentences

His father, John, a Navy veteran of World War I, worked as a boring mill operator at an aircraft company, according to government records.

From Washington Post • Jul. 27, 2019

Most of the parts machined in a vertical boring mill are made of cast iron and, ordinarily, at least one roughing and one finishing cut is taken.

From Turning and Boring A specialized treatise for machinists, students in the industrial and engineering schools, and apprentices, on turning and boring methods, etc. by Jones, Franklin D.

A boring mill, of which the speed may be varied from one turn in six minutes to twenty-five turns in one minute, will be suitable for all ordinary wants that can occur in practice.

From A Catechism of the Steam Engine by Bourne, John, C.E.

The turning tools of a vertical boring mill are similar, in many respects, to those used in a lathe, although the shanks of the former are shorter and more stocky than those of lathe tools.

From Turning and Boring A specialized treatise for machinists, students in the industrial and engineering schools, and apprentices, on turning and boring methods, etc. by Jones, Franklin D.

It is known as a “vertical turret lathe,” but resembles, in many respects, a vertical boring mill.

From Turning and Boring A specialized treatise for machinists, students in the industrial and engineering schools, and apprentices, on turning and boring methods, etc. by Jones, Franklin D.