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I work at a machine shop, so I'll try to explain it a little. The tool used is called a Boring Bar, it has a single cutting edge on it, and it is moved outward and into the metal to be removed. Most common boring I do at work is on Sprockets. We chuck them up in the lathe, and bring them out to whatever size is specified on the print. A drill is the first tool used, just to put a hole in the peice. A reamer is a fairly accurate way to produce a hole, but it can only be done after the hole as been drilled out, normally about 1/16th undersize. A reamer isn't always the most practical way to go. Reamers get expensive, and they don't come in every size you need. The most practical way to go is several different size boring bars. Small ones to get into holes 3/4-1/2", another to be used from 7/8 or so up to say 1 1/2-1 3/4" Then there is a big one, used for just about everything above 2". You can get any size desired, metric, fractional, or the occasional odd ball size that is neither, all with one tool.
Hope I helped you out some
Donovan from Wisconsin
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