What is "boring bar"

Boring \Bor"ing\, n.

1. The act or process of one who, or that which, bores; as, the boring of cannon; the boring of piles and ship timbers by certain marine mollusks.

   One of the most important applications of boring is in the formation of artesian wells.
   --Tomlinson.

2. A hole made by boring.

3. pl. The chips or fragments made by boring.

   Boring bar, a revolving or stationary bar, carrying one or more cutting tools for dressing round holes.

   Boring tool (Metal Working), a cutting tool placed in a cutter head to dress round holes.
   --Knight.

A boring bar is a tool used in metalworking and woodworking. Boring is a technique used in many aspects of building. Woodworkers have used boring as a form of drilling for centuries. In woodworking, the boring tool is static in size and used to form circular plunge cuts. In metalworking, boring is slightly different in that the hole that results need not be circular. In metal boring the tool can be plunged and dragged on the X or Y axes to create a slot or asymmetrical hole or channel, or it may be moved only in an up-and-down motion (on the Z axis) to create a perfect circular hole.