Drilling is accomplished with the use of a spinning drill bit. The drill bit is used as a cutter to remove the material to create a hole in the work piece. Drilling can take place on a milling machine, a drill press, or even a simple hand drill.
Drilling is essential when creating bolt holes in thicker pieces of steel. When higher precision is required a drill bit makes a pilot hole and a reamer is used to cut the hole to the desired size. With a drill bit and reamer it is possible to hold a tolerance of .0001.