boring-mill

boring mill

noun
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:
1825–35

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World English Dictionary
boring mill
 
n
engineering Also called (informal): roundabout 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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