Boring is the method used to enlarge a hole that has already been cast or drilled via a single-point cutting tool or a boring head that contains multiple such tools. The hole created by a boring machine could be cylindrical or tapered.
There are several kinds of boring processes including horizontal boring, line boring, and vertical boring. Horizontal boring machines bore holes with a spindle that is parallel to the work table. Line-boring machines have a boring bar that is supported on both ends. Vertical boring involves clamping down the part to be bored, and a machining tool being fed down into the part.