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

This is especially true of the heavy parts for which the boring mill is principally used.

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.

Remember this is a boring mill tool and will stand out in the tool-post, and if you do not have a high thorough lemon heat, your tool will snap off at the dotted line.

From The Working of Steel Annealing, Heat Treating and Hardening of Carbon and Alloy Steel by Colvin, Fred H. (Fred Herbert)

I had no difficulty in locating Hart Jones, for he was striding from lathe to workbench to boring mill, issuing his orders with the sureness and decision of a born leader of men.

From Astounding Stories of Super-Science July 1930 by Bates, Harry

The construction and operation of this machine is very different from that of a vertical boring mill and it is also used for an entirely different class of work.

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.