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   Boring

Boring is a machining process performed to enlarge the diameter of an existing hole. In traditional shops boring is typically performed using a mill or a lathe. For large production runs or for projects that have unique requirements other specialized boring machines may be utilized. There are several types which include: line boring, tunnel boring, horizontal boring, directional boring, cylinder boring, jig boring, portable boring and vertical boring among others.

A basic level boring achieves three things:

  1. Boring brings the hole to proper size and finish. While size is determined by the characteristics of the boring tool itself - the required finish requires the right blend of feed, speed and nose radius.

  2. Boring straightens the original drilled or cored hole. This corrects defects in castings or drilled holes that have wandered off center.

  3. Boring makes the hole concentric with the outside diameter which is being held in the chuck, fixture or other work holding device.

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