The main difference between boring and drilling is that when boring, each time the hole is enlarged, its size is not necessarily the same, and the hole is enlarged because of the forming knife, so every time the hole is enlarged, its size is the same. Secondly, the expansion range of the borehole is relatively small, and the boring hole, there is no limit, you can process the hole to as large as you want.

Boring is done on the basis of already having a hole (for example, the workpiece already has a hole, or a hole is drilled with a drill bit first) and then the turning tool (or boring tool) is divided several times on the lathe or boring machine respectively. The process of enlarging the hole and achieving higher precision than the original base hole is called boring. Boring is a process in which a hole is processed with a drill bit first, and then a forming knife is used, which is generally a bit larger than the original drill bit, or it is also called a boring drill to enlarge the hole.