Drilling is a process of producing round holes in a solid material or enlarging existing holes with the use of multitooth cutting tools called drills or drill bits. Various cutting tools are available for drilling, but the most common is the twist drill.
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.
Reaming is a process of improving the quality of already drilled holes by means of cutting tools called reamers. Drilling and reaming are performed on a drilling press, although other machine tools can also perform this operation, for instance lathes, milling machines, machining centers.
In drilling and reaming, the primary motion is the rotation of the cutting tool held in the spindle. Drills and reamers execute also the secondary feed motion. Some finishing reaming operations are manual.
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