Sep. 02, 2024
Configuring an excavator for a specific application requires some planning. Many factors come into play, such as the working range of the boom and bucket bar, material density, required output, use of attachments and quick connectors, and lifting capacity requirements, to name a few.
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Manufacturers offer a variety of bucket bar and boom options for midsize excavators. For example, Caterpillar typically offers heavy-duty (HD), extreme service, and long boom, depending on the model. Heavy-duty boom and bucket bar configurations are typically used for earthmoving applications. Extreme service rod and boom combinations are for demanding applications, such as demolition with a large number of attachments.
Long Reach Arm and Boom
The front end adds some weight compared to using a standard heavy-duty boom, so you will have less cycle time. But it is application-specific. When you're running hammers or scissors and multiprocessors continuously, you want the machine to last longer, so you turn to a boom and bucket configuration that can handle that kind of abuse.
You have every bucket bar option and every moving arm option, including extra-long reach configurations. You can see the maximum digging depth and maximum flat bottom depth for each machine.
Contractors should understand the application they are using the machine for before selecting a combination of work equipment. General items to consider include job scope, haul size, productivity and bucket options needed, and whether one or more attachments have potential use.
Your primary bid for the job will determine the appropriate configuration. Underground contractors and basement excavators typically purchase long booms for optimum efficiency. Off-road pipelining or land clearing contractors will purchase medium arms for stability and optimum productivity. Large excavator contractors will purchase short arms for boom strength and optimum productivity.
Contractors digging trenches and putting in sewer/water lines often want to reach out, so they may order a long arm with a coupler and two buckets. If the contractor is adding an attachment such as a thumb, the person would order a mid-arm for added stability. If the contractor is digging into tough material, he'll buy a short arm for an extra breakout.
Digging Bucket &nbs
In applications where a long boom/boom combination is used, the main benefit is an expanded working range that can add versatility to certain applications.
Longer moving arms and bucket bar options typically reduce arm crowding forces. Longer work equipment typically reduces lateral lift forces due to its greater impact on machine stability, while forward lift forces are more dependent on hydraulics. Shorter moving arm/boom options can have the opposite effect when the working range is limited.
Arm length is also directly related to the bucket size that can be used. The shorter the boom, the higher the boom force and the larger the bucket.
In all respects, it appears that a shorter arm will provide higher productivity. But in reality, it depends on the application and type of material the contractor is excavating. A shorter arm will fill buckets of hard materials faster; but with softer materials, an excavator with a shorter arm will have more movement and more pipe joints.
There are other trade-offs to consider. One disadvantage of shorter work equipment is a reduced working range that limits the ability to reach the desired depth or dumping height. The benefit of a shorter boom/arm combination is that the workforce is closer to the machine, so the operator typically experiences greater stability and can use a larger range of attachments and bucket sizes if the application requires it.
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Excavators are extremely versatile pieces of equipment. They can be used for digging, moving materials, demolition and even forestry work. And while excavators come in all shapes and sizes depending on your needs, one notable difference is the type of arm you use.
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The first type is a standard arm, which has one joint that bends, allowing the excavator to reach down, dig, and then start again. The second is the knuckle boom, which is also sometimes known as an articulating boom. This features extra joints, so you can move the boom as needed to get into hard-to-reach places. It can also move left to right, due to the multiple pivot points in the arm.
Both have their pros and cons, and ultimately the one you choose will depend on the type of work you&#;re doing, and the specific location.
The benefits of a knuckle boom
Let&#;s jump straight in and look at the benefits of using a knuckle boom.
The biggest advantage to a knuckle boom is the multiple pivot points. While they may be slightly more difficult to operate, you have so much more flexibility regarding the places you can reach. For example, you can reach over obstacles and still dig clearly behind them.
Being able to move the boom left and right, almost in a swinging motion, also gives the operator much more ability to work with precision.
So, if you&#;re working on a site with lots of obstacles or uneven ground that makes your work difficult, a knuckle boom excavator is probably going to be your best friend.
The disadvantages of a knuckle boom
In all honesty, there aren&#;t too many disadvantages to a knuckle boom. Especially when being compared to a standard arm excavator, because the knuckle boom can do basically everything a standard arm does.
However, one must certainly consider the cost, with knuckle boom excavators being more expensive than a standard arm. They&#;re also slightly more difficult to operate. So, in a lot of ways, you can save yourself time, money and complications by just choosing a standard arm.
The benefits of a standard arm
You would think that with all of the flexibility, strength and functionality you gain from a knuckle boom excavator, there would be no reason to consider a standard arm. However, there are actually some terrific reasons to go standard over articulated.
Firstly, there is the cost. Articulated knuckle boom excavators cost more to buy and hire, simply because they are a more advanced piece of equipment. If you don&#;t need the knuckle boom functionality, then you&#;re simply wasting money by hiring one when a standard arm would suit your needs perfectly.
Secondly, standard arms are easier to operate. While knuckle booms are great, the extra joints mean they are more complex. This means things can take a bit longer with a knuckle boom, compared to just setting up quickly and getting to work with a standard arm.
In addition, standard arms often have a longer horizontal reach, which makes them great for open areas where there are few obstacles in your way.
The disadvantages of a standard arm
When comparing these two types of excavator arms, there are some obvious drawbacks to the standard arm. Most importantly it only has one joint, and can only move with that joint in an up-and-down motion. Naturally, they are still very effective pieces of earthmoving equipment, however, they lack the flexibility of a knuckle boom.
If you&#;re working in a space that&#;s difficult to reach, or where there are a lot of obstacles, the lack of multi-directional movement can make a job much harder, so in those instances, you&#;d be better off with a knuckle boom.
Which one is best?
Ultimately, it&#;s fair to say that a knuckle boom excavator is the &#;better&#; option. However, we only say that because of the extra movement and functionality. If you don&#;t need that extra movement because you&#;re working on reasonably flat, clear sites, there is really no need for a knuckle boom.
The real &#;best&#; option in this case, is the one that suits your type of work best. You can save money by opting for a standard arm, or you can gain extra flexibility with a knuckle boom. The choice is yours.
Looking for knuckle boom excavators?
No matter what type of excavator you&#;re looking for, Earthmoving Equipment Australia has got you covered. From mini excavators to specialist long-reach knuckle boom excavators, we&#;ve got all of the right equipment to get the job done more easily and to a higher standard. If you&#;re not exactly sure what you need for an upcoming project, contact our expert team and we&#;ll be happy to help. We have all types of heavy machinery and equipment, as well as all the attachments you could ever want. Give us a call today, and we&#;ll be more than happy to help.
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