Whether you look at the boom or arm as one part and attachments as another, they both rely on each other and are connected. This is why the arm of the excavator is often seen as the third part of the machine and they are not separated. In general, the arm is made up of a boom, a stick, and an attachment.
There are a few different types of booms that can be found on excavators. The most common is the mono boom – the arm bends in one direction only. There are knuckle booms or hinge booms that allow for alternative rotation and movement. These different boom types allow operators to dig exactly what they need to dig no matter what type of environment they are working in.
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