boring bar

Metalworking. a bar holding a tool for boring a cylinder or the like.

Origin of boring bar

First recorded in 1835–45

Next, the boring-bar m1 is brought into position, the drill support being swung back out of the way.

Turning and Boring |Franklin D. Jones
In the first operation, boring-bar m is brought in line with the spindle and is entered in bushing r in the chuck.

Turning and Boring |Franklin D. Jones
When a hole is to be bored, a boring-bar B1 is inserted in the spindle and the cutter is attached to this bar.

Turning and Boring |Franklin D. Jones
The spindle S which drives the boring-bar, and the spindle feeding mechanism, are carried by a saddle.

Turning and Boring |Franklin D. Jones

At the same time, the bore is finished by a cutter in boring-bar D (Fig. 4).

Turning and Boring |Franklin D. Jones