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The main use of drilling is to produce holes in metal parts. The process is carried out using a rotary drill bit. The drill bit is a multi-point rotary cutting tool. The bits are used to remove material from the workpiece. Sand castings use cores for displacement. The molten metal flows around the core during the casting process. Once the casting is removed from the mold, the core disintegrates, leaving the desired holes in the part. To drill these cores, the core requires a heavy body drill for cleaning the sidewall. In addition, the body of the drill can be ground to grind more than one diameter.

Spot facing is another method used in drilling. This process is also a form of milling. The surface finish of a piece can be between 32 and 500 microinches. The process of boring involves a part way into the workpiece. It is commonly used for guiding and drilling guide holes. This method is most effective when the hole is shallow and must be precise. It may not be suitable for larger components.

A drill bit is a multi-point tool that provides at least two cutting edges. The drill bit is a very effective process for machining. Depending on the size of the hole, drilling can be used to increase the axial length of a hole. This process is efficient and produces a smooth surface that can be easily cleaned. A proper machining strategy is essential for the best results. While the drill is not as effective as a milling machine, it can still be very useful in removing excess material.