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In machining, boring is the process of enlarging a hole that has already been drilled or cast by means of a single-point cutting tool or of a boring head containing several such tools, such as in boring a gun barrel or an engine cylinder. Boring is used to achieve greater accuracy of the diameter of a hole, and can be used to cut a tapered hole. Boring can be viewed as the internal-diameter counterpart to turning, which cuts external diameters.
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