The excavator, also known as a “Bagger”, is a piece of mechanical engineering equipment that consists of a long digging arm with a bucket (backhoe) mounted on a rotating platform (“pivot”) that moves on tracks. The excavator is a heavy and slow machine, but it has a variety of uses. By default, the digging arm is equipped with a bucket, but it can be replaced with a pneumatic hammer (“air hammer”) – which is mainly used for demolishing buildings – or a shearer (a device resembling large scissors), a grapple, and even a drill..