Metalworking. a machine for boring large holes in heavy work, having a table on which the work rotates while the hole is bored vertically.
Origin of boring mill
First recorded in 1825–35
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
British Dictionary definitions for boring mill
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 itAlso called (informal): roundabout
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012