boring bar

noun

First recorded in 1835–45

The boring bar is counterbalanced by a weight within the frame.

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.

April 19, 2024tortuous

[tawr-choo-uhs ]

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