Drilling is a machining operation in which the tool rotates with an axial displacement, except when mounted on lathes, where the drill is fixed and the drilled bars rotate.
In drilling, the cutting speed varies along the cutting edge. At the drill point, the cutting speed is zero. The point does not cut, but pushes the metal.
- Tapping is a machining operation which produces internal threads in a drilled hole.
- Tapping is the most efficient way to produce precise internal threads with cost efficiency.
- Tapping is an easy operation but subject to chip packing in deep blind holes.
- Tapping can be performed on all types of machines or with a self-reversing tap holder.