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.

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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

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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

Very often more than one tool is used at a time, as will be shown later by examples of vertical boring mill 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.

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.

Turning the Rim of a Flywheel Turning a Flywheel on a Vertical Mill.—The turning of a flywheel is a good example of the kind of work for which a vertical boring mill is adapted.

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)