- Metalworking. a bar holding a tool for boring a cylinder or the like.
Origin of boring bar
First recorded in 1835–45
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Examples from the Web for boring bar
At the same time, the bore is finished by a cutter in boring-bar D (Fig. 4).
This head is also driven by a key which engages a keyway in the boring-bar.
Next, the boring-bar m1 is brought into position, the drill support being swung back out of the way.
In the first operation, boring-bar m is brought in line with the spindle and is entered in bushing r in the chuck.
When a hole is to be bored, a boring-bar B1 is inserted in the spindle and the cutter is attached to this bar.