Excavator Introduction

Excavators or shovels are machines designed for digging or earthmoving works and they come in all shapes and sizes. They are very common nowadays and mainly found in construction projects, mines, quarries or just about any place where excavation is required.

The ancestor of the modern excavator as we know it today was probably the Steam Shovel, patented by William Smith Otis in 1839. Steam shovels used a system of pulleys to move their arms and bucket. However it's working principle is exactly the same with the modern excavator.

Prior to the advent of the steam shovel all earthmoving had to be done manually. The steam shovel revolutionized the construction and civil engineering industries, bringing projects which before deemed impractical into reality.

A Modern Hydraulic Excavator

Modern excavators are diesel powered and make use of hydraulics power to perform digging. Thus these machines are also called hydraulic excavators. The basic parts that make up an excavator consist of the bucket, the stick, boom and the cab. The cab is where the operator sits and is also where the engine and hydraulic systems are located. The whole thing is either mounted on top of a tracked or wheel base and can swing 360 degrees.

Excavators are classified according to their bucket action. A downward arch bucket motion is known as a hoe or back hoe. A back hoe perform excavation by pulling the bucket towards the machine and curling the bucket inward. On the other hand when the bucket motion is an upward motion, the machine is known as a front shovel. The front shovel perform excavation by crowding the material away from the machine.

Demolition using an excavator

Excavators are very versatile and beside digging they can be adapted by replacing the bucket with other tools for a variety of task. These are but not limited to the following

* Demolition ( as shown in the left picture )
* General grading/landscaping
* Lifting
* River dredging

Excavators are sized according to their weights and bucket sizes. The smaller ones are called a mini-excavator or compact excavator. The largest model from one of the manufacturers can weight up to 805,000kg (1,770,000 lb) and with a bucket volume of 40.0m3 (52.3yd3).

On the other end, from the same manufacturer, a mini excavator, the smallest one weights 1740kg (3836 lb) and with a bucket size of 0.02m3 (0.026yd3). Most of the time medium excavator are the popular choices. Medium size excavators can weight ranging from 6300kg to 37800kg ( 13900 lb to 83335 lb) with bucket volume of 0.13m3 to 1.5 m3 ( 0.17yd3 to 1.96yd3 )

Note :- m3 is cubic meters and yd3 is cubic yards.

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