Boring is a different process from other hole making machining operations, such as drilling and reaming. Drilling is making an initial hole and reaming smooths out the walls of an existing hole. Boring is used to produce accurate size holes within required tolerance specifications using an existing pre-drilled hole. The following are some tips to assure your boring project meets your specifications.

Boring precisely enlarges existing holes in a part. Generally, boring on a turning bar is less complex than on a milling machine. A boring bar on a lathe can make any size hole if the bar will fit into the hole. Boring heads for milling machines have a limited range. 

While the basic process of boring, enlarging holes that have already been drilled, sounds simple, it can become complex quickly. When the boring process involves intricate machined parts and materials the complexity of making pre-drilled holes larger, concentric, properly sized, or finished is more complicated projects. The following are types of boring that can get the complicated job done.

The boring process involves machining a pre-drilled or pre-cast hole with a single point cutting tool or boring head to enlarge its original size. Using a single cutting tip of steel, cemented carbide, or diamond bore, the boring machine can produce smooth and accurate holes in a part. The most common boring tools are braces, bits, and gimlets. Other tools include a joiner that uses different chisels, hand boring tools, and electric power drills. Line boring is an engine machining process to enlarge a hole, while making perfectly straight and aligned bores. A line boring machine performs this task using one or more cutting tools held within a boring head.

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Generally, the process of boring makes a drilled or cast hole larger with a single boring head or point cutting tool. The hole is first drilled to create the initial hole in a part and then boring enlarges the existing hole utilizing awls, gimlets, and augers. The basic tool for making a hole in a part is an awl, which pushes material to one side without removing it. Other tools used in the process include drills, gimlets, and augers. These tools have cutting edges that detach material to create the hole. The following are the range of the types of boring.