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1- Boring on the Lathe - Definition
Boring on a lathe, like boring on a mill, is defined as the enlarging of a existing hole. This hole can either be drilled, cast, forged, or molded.. As with mill boring the need is usually based upon tolerance and/or finish requirements.

Most boring (as shown above) is accomplished with a boring bar mounted in the tool post.

The animations below show a boring bars with a cutting tool mounted at a 90 degree angle to the axis of the bar. There is usually a set screw on the very end that holds the tool in place.

The graphics below shows how more than one tool can be mounted in a boring bar to achieve more than one operation in a single pass. This is called "gang" tooling.

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