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From building skyscrapers to loading freight trains, from tearing down old houses to mining fuel, heavy equipment is everywhere! Children will enjoy taking a close-up look at these important machines, including terrific tractors, bucket wheel excavators, and even a super space shuttle crawler—the largest self-powered tracked vehicle in the world. Great-looking and large shots showcase extra-big tires, a tractor’s advanced hydraulic system, a control stick for steering, a bulldozer blade, and the long, wide tracks of a crawler crane. And kids will really dig into fascinating facts and information on heavy machine achievements such as building the Chunnel, the longest tunnel on earth.

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]]> Both of these machines are affordable, popular,  highly productive, and they both have helped lay a lot of cable and pipe in the ground.  While they both can do the work, there are differences as to how they perform when stacked up against each other in residential utility installations.

Size and price
The average dig depth for utility installations in residential applications is between 40 and 48 inches.  The basic trencher that digs to the above depth will boast a 20 – 30 horsepower engine and cost around 40,000 dollars.
The most popular type of compact excavator is the 2.5 metric ton size class, and it uses a 30 HP engine and costs around the same price.  The biggest difference in the two surfaces when you need the trencher to dig deeper.  The 2.5 metric ton excavator has no trouble at all digging to 8 feet or more, although a trencher that can dig that deep will require an engine with around 100 horsepower and cost upwards of 90,000 dollars!

Life costs
Not counting the bucket teeth and the replacement of the rubber tracks at 2,000 hours, fuel and routine maintenance are your only daily costs with a compact excavator.  The digging chain, teeth, and sprockets on the trenchers are considered wear items and need to be replaced often.  Even with the high consumable costs of trenchers, the differences will tend to even out when productivity is taken into effect.

Productivity
For straight line trenching at an average depth, trenchers will flat out lead compact excavators. Under reasonable conditions, a trencher can work three to four times faster than that of a compact excavator.  Another area where trenchers really excel is wooded areas, where tree roots and logs can make for slow and sloppy digging when using a bucket.

Versatility
When it comes down to it, compact excavators can do a lot of things that trenchers can’t, especially when they have attachments on hand.  If you are
digging with a compact excavator, you can’t go anywhere near as fast as you can with a good quality trencher. Keep in mind that a trencher isn’t a single minded machine either.  Most styles of trenchers can be outfitted with a backhoe attachment that attaches to the front end.  Whenever concrete, rocks, or asphalt stands in the way, the boom and chain can be replaced with rock teeth and a wheel.  In soft soils, you can set up a trencher with a plow
attachment and plow in cables faster than using any other available method.

When it comes down to choosing, keep in mind that it all depends on your needs.  There are some cases where the compact excavator is best to choose, while there will also be jobs in which the trencher is going to do the best work.

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Here is a super-colossal book for grown-ups who like big things, Descriptions, facts, specs, and stories are presented on massive dump trucks, huge bulldozers, immense tree shredders, and all other types of super-large machines. 250 color & b&w photos. ....read more

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Medieval cranes
Cranes of the Middle Ages were used to build the cathedrals of Europe.  The crane was fixed on top of a wall as it was being constructed and was powered by men that ran inside of two large wheels on each side.  Cranes were also used in medieval ports and in shipyards.

Mobile cranes
The most basic type of crane consists of a steel truss or telescopic boom mounted on a mobile platform, which could be a rail, wheeled, or even on a cat truck.  The boom is hinged at the bottom and can be either raised or lowered by cables or hydraulic cylinders.

Telescopic crane
This type of crane offers a boom that consists of a number of tubes fitted one inside of the other. A hydraulic mechanism extends or retracts the tubes to increase or decrease the length of the boom.

Tower crane
The tower crane is a modern form of a balance crane.  When fixed to the ground, tower cranes will often give the best combination of height and lifting capacity and are also used when constructing tall buildings.

Truck mounted crane
Cranes mounted on a rubber tire truck will provide great mobility.  Outriggers that extend vertically or horizontally are used to level and stabilize the crane during hoisting.

Rough terrain crane
A crane that is mounted on an undercarriage with four rubber tires, designed for operations off road.  The outriggers extend vertically and horizontally to level and stabilize the crane when hoisting.  These types of cranes are single engine machines where the same engine is used for powering the undercarriage as it is for powering the crane.  In these types of cranes, the engine is normally mounted in the undercarriage rather than in the upper portion.

Loader crane
A loader crane is a hydraulically powered articulated arm fitted to a trailer, used to load equipment onto a trailer.  The numerous sections can be folded into a small space when the crane isn’t in use.

Overhead crane
Also referred to as a suspended crane, this type is normally used in a factory, with some of them being able to lift very heavy loads. The hoist is set on a trolley which will move in one direction along one or two beams, which move at angles to that direction along elevated or ground level tracks, often mounted along the side of an assembly area.

In the excavation world, cranes are used to move equipment or machinery.  Cranes can quickly and easily move machinery into trenches or down steep
hills, or even pipe.  There are many types of cranes available, serving everything from excavation to road work.

Cranes are also beneficial to building bridges or construction.  For many years, cranes have proven to be an asset to the industry of construction
and excavating.  Crane operators make really good money, no matter what type of crane they are operating.

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Bobcat
Bobcat gave its compact backhoe loaders a power boost when the company introduced the second generation B series to the lineup.  The 31.5 HP B100 received a 45% increase in backhoe bucket breakout force and a 27% jump in the breakout force of the dipper.

The 46 HP B300 received a 44% increase in dipper breakout force and a 21% boost in the breakout force of the bucket.  The three model line also includes the B250, which is a 31.5 HP sideshift unit.  Similar to the larger B300, the B250 also features all wheel steering and four wheel drive.

New Holland
Each one of the four models of backhoe loaders in the New Holland lineup use the new 4.5 liter turbocharged Tier 2 engine.  This new engine and a number of other upgrades were the basis for the B series machines, which offer low effort pilot controls which will give you a choice between excavator or loader style patterns.

Case
Case added quite a bit to its M series backhoe loaders, by switching to family 3 engines to meet Tier 2 emission standards.  The new machines of the M series have quieter, larger displacement engines for better lugging capacity.  They also have increased torque rise for faster cycles of loader and backhoe operations. With 500 hour intervals of oil changes and easy to access transmission mounted hydraulic pumps, the M series is surely a force to be reckoned  with in the world of backhoes.

Ingersoll-Rand
The newest compact backhoe loader from this company can reach digging depths of up to 12 feet with its backhoe.  Working as a loader, the BL-580 has an operating capacity of 3,406 pounds with a breakout force of 9,370 pounds. Both the loader and backhoe are equipped with standard auxiliary hydraulics with a two way flow to accommodate a variety of attachments, which includes booms, breakers, augers, and even compactors.  Other nifty features include hydrostatic four wheel drive for power and traction, and all wheel steering for a tight radius.

Komatsu

Komatsu announced that the optional excavator style joystick controls would be offered on its five model lineup of backhoes.  The lineup has also been upgraded with increased hydraulic speed, stronger components, and Tier 2 engines. The entire Komatsu line consists of the 87 HP WB140 series, and teh 94 HP WB150 series.

The standard model found with each series features a four speed mechanical transmission complete with a torque converter.  The fifth model from Komatsu is the WB150, with offers an all star wheel design with a powershift transmission and anti theft prevention system.

John Deere
The 410H is the hallmark of John Deere, offering 92 HP.  The 410H also offers the total machine control system, which integrates control for the engine, transmission, hydraulics, and brakes so that the system can respond in an efficient way to the many different job demands.

Terex
Since acquiring the Fermec line, Terex has marketed a full and impressive line of backhoes.  The models include the 92 HP TX760B and the 100 HP
TX860B.  At 100 HP as well are the 860SX, 860 Elite, and the 970 Elite.  Both the 760 and 860 models feature four speed shuttle gearboxes and travel speeds of up to 25.8 miles per hour.

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The drag line excavator bucket system consists of a large bucket that is suspended from a boom.  The bucket is moved by a number of chains and ropes.  The hoisting rope, which is powered by either a large diesel or electric motor, will support the bucket  and hoist coupler assembly from the boom.  The  drag rope on the assembly is used to draw the bucket assembly horizontally.  Through skillful maneuvering of the hoist and drag rope, the bucket can be controlled for many different types of operations.

Operation
With a typical excavation cycle, the bucket is positioned high above the material that is being excavated.  The bucket is then lowered down and the
drag rope is drawn so that the bucket is dragged along the materials surface.  Using the hoist rope, the bucket is then lifted.  A swing operation is  then performed in order to move the bucket to the place where the material is going to be dropped. The drag rope is then released which will cause the
bucket to tilt, making the material in the bucket fall down, which is commonly known as a dump operation.

With smaller drag line excavators, the bucket is thrown by winding up the jib then releasing a clutch on the drag cable, which swings the bucket like a pendulum.  Skillful operators can make the bucket land about 1/2 the length of the jib further away than if it had just been spun or dropped.

Limitations
The limitations of drag line excavators are the height and length of their boom, as this limits where the drag line can dump waste material.  Being inherent with their construction, the drag line is most effective when excavating material below the level of their tracks.  Drag lines  aren’t suitable for loading piled up material.

Despite their limitations and high capital cost, drag line excavators remain very popular with several mines, due to their very low waste removal cost, performance, and reliability. They also have different cutting sequences.  The
first is the side casting method which uses  of-fest benches.  This method involves throwing the overburden sideways onto blasted material to make a bench.

The second method is a key pass.  This pass will cut a key at the toe of the new highwall and will also shift the bench further towards the low wall.  This can also require a chopping pass if the wall is blocky.  A chopping pass will involve the bucket being dropped down onto an angled  highwall to scale the surface. The next method is the slowest, known as the  blocks pass.  This method will however, move the most material.  The blocks pass involves using  the key to access the bottom of the material to lift it up to spoil or to an elevated bench level.  If required, the final cut is a pull back, which pulls the material back further to the low wall side.

For construction, mining, or excavation, drag line excavators are great to have.  They can move even the biggest of material, which is great for deep  holes in the ground.  If you’ve been looking for a great way to maximize mining or excavation productivity, the drag line excavator is just what you need.

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