Equipment | Machines | Machinery

Hydrualic Machinery

2009-10-29T00:11:00.000-07:00

Hydraulic Machinery

Hydraulic machinery are machines and tools that use
fluid power to do the work. Almost all types of
heavy equipment is a common example. With this type
of equipment, hydraulic fluid is pumped to a high
pressure then transmitted through the machine to
various actuators.

The hydraulic pumps are powered by engines or electric
motors. The pressurized fluid is controlled by the
operator with control valves and then distributed
through hoses and tubes.

The increasing popularity of hydraulic machinery is
due to the large amount of power that is transferred
through small tubes and flexible hoses. The high
power density and wide array of actuators can make
use of this power.

Hydraulic power
The theory that lies behind hydraulic equipment is
fluid pressure.
1. A force that acts on a small area can
create a bigger force by acting on a larger area
by hydrostatic pressure.
2. A large amount of energy can be carried
by a small flow of highly pressurized fluid.

Pumps
A hydraulic pump will supply the fluid to the
components in the system. Pressure in the system
will develop in reaction to the load. Pumps have
a power density of around ten times greater than
an electric motor. The pumps are powered by an
electric motor or engine, which is connected through
gears, belts, or a flexible elastomeric coupling
to reduce the heavy vibration.

The common types of hydraulic pumps for hydraulic
machinery applications include:
1. Gear pump - the gear pump is cheap,
durable, and simple. It is less efficient, simply
because it is constant displacement and suitable
for pressures that are below 3,000 psi.
2. Vane pump - vane pumps are cheap, simple,
and reliable. They are good pumps for higher flow
low pressure output.

Hoses and tubes
A hydraulic hose is graded by pressure, temperature,
and compatibility of fluid. A rubber interior is
surrounded by multiple layers of woven wire and
rubber. The exterior of the hose is designed for
resistance against abrasion.

The bending radius of the hydraulic hose is
designed very carefully into the machine, since
a hose failure can be deadly, and violating the
minimum bend radius of the hose can also cause
failure.

A hydraulic pipe is thick enough to have threads
cut into it for connections. It's rarely used
for high pressure systems though, which prefer to
have tubes or hoses. The pipe itself lends to
weldings and can also be used to fabricate the
manifold.

Hydraulic pipes on the other hand are preferred
over hoses whenever possible, as they are simply
more durable. Tubes are also preferred over pipes,
as they weigh a lot less. Hydraulic tubes will
normally have flared ends and captive nuts to
make connections. They can also be steel welded
with floating nuts and face seal fittings on the
ends.

Both tubes and pipes for hydraulic applications
traditionally haven't been plated or painted,
since the temperature and oil they operate under
drive away moisture and reduce the risk of rust.

Fittings
The fittings with hydraulic machinery serve
several purposes:
1. To bride different standards, such
as the O-ring boss to JIC or pipe threads to the
face seal.
2. Allows proper orientation of
components, as a 45 or 90 degree, straight, or
even swivel fitting will be chosen as it is
needed. They are designed to be positioned in
the correct orientation and then tightened as
needed.
3. To incorporate bulkhead hardware.
4. A quick disconnect fitting may be
added to a machine without having to modify hoses
or valves.

Forklift Trucks - Heavy Machinery And Equipment!

2009-10-27T00:09:00.000-07:00

Forklift

Sometimes called a forklift truck, the forklift is
a powerful industrial truck that is used to lift
and transport material by steel forks that are
inserted under the load. Forklifts are commonly
used to move loads and equipment that is stored on
pallets. The forklift was developed in 1920, and
has since become a valuable piece of equipment in
many manufacturing and warehousing operations.

Types
The most common type of forklifts is
the counter balance. Other types of designs
include the reach truck and side loader, both of
which are used in environments where the space is
at a minimum.

Control and capability
Forklifts are available in many types and different
load capacities. In the average warehouse setting,
most forklifts have load capacities of around
five tons.

Along with the control to raise and lower the
forks, you can also tilt the mast to compensate
for the tendency of the load to angle the blades
towards the ground and risk slipping it off the
forks. The tilt will also provide a limited
ability to operate on ground that isn't level.

There are some variations that allow you to move
the forks and backrest laterally, which allows
easier placement of a load. In addition to this,
there are some machines that offer hydraulic
control to move the forks together or further
apart, which removes the need for you to get out
of the cab to manually adjust for a different size
load.

Another forklift variation that is sometimes
used in manufacturing facilities, will utilize
forklifts with a clamp attachment that you can
open and close around a load, instead of having
to use forks. Products such as boxes, cartons,
etc., can be moved with the clamp attachment.

Safety
Forklifts are rated for loads at a specified
maximum weight and a specified forward type center
of gravity. All of this information is located
on a nameplate that is provided by the manufacturer
and the loads cannot exceed these specifications.

One of the most important aspects of operating a
forklift is the rear wheel steering. Even though
this helps to increase maneuverability in tight
cornering situations, it differs from the
traditional experience of a driver with other
wheeled vehicles as there is no caster action.

Another critical aspect of the forklift is the
instability. Both the forklift and the load must
be considered a unit, with a varying center of
gravity with every movement of the load. You
must never negotiate a turn with a forklift at
full speed with a raised load, as this can easily
tip the forklift over.

Normally, to drive a forklift, you'll need to
pass a basic test. They aren't difficult to
operate, although you'll need to be safe when you
operate them. Once you have operated one for a
while, you'll have no problems being safe.

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Excavation - Meaning, Information, Usage

2009-10-25T00:08:00.000-07:00

Excavation

Excavation is most commonly and best known for a
technique within the science of archaeology. The
individual types of excavation are known simply
as digs to those who participate, with this being
an over literal description of the process. An
excavation concerns itself with a specific
archaeological site or connected series of sites,
and may be carried on over a number of years, since
the work is normally seasonal.

Within the industry of excavation, many more
techniques may be utilized, with each dig having
its own particular features that may necessitate
differences of approach. Resources and other
practical issues don't allow archaeologists to carry
out excavations whenever and wherever they choose,
as many known sites have been deliberately left
alone and non excavated.

Initially, excavation involves the removal of any
topsoil that is uncovered by machine. What is
dug up may be examined by a metal detector for stray
finds but unless the excavation site has remained
untouched for a long period of time, there is a
small layer of modern material on the surface that
is of limited archaeological interest.

In rural areas, any type of archaeological features
should be visible beneath the surface. With
urban areas, they may be thick layers of human
deposits and only the uppermost will be visible to
the naked eye. With either case, the first task
is drawing a scaled site plan that will show the
edges of the excavation.

This plan can be composed using tape measures, or
as it is more common these days, an electronic
total station. A grid is normally set up, to
divide the site.

Excavation is also useful for digging out houses
and trenches. When clearing dirt out for roads
or sub divisions, excavation is what takes care of
things. Even though there are a few means, the
term excavation is used anytime that the earth or
dirt is disturbed.

Heavy machinery is also very common with excavation,
such as excavators or backhoes. Excavating crews
run the equipment and dig up soil and rocks for
whatever the purpose may be. Excavators are the
most used machinery, as they can move a lot of dirt
in a little bit of time.

Anytime you are taking part in excavation, you should
always use common sense and be safe. If you plan
to get down into a hole or trench, you should always
use a trench box. Even though the hole may not
be that deep, excavation sites can always cave in
and at that point - things are very dangerous and
possibly even deadly.

For digging up rare artifacts or putting in houses
or roads, excavation is something that has been around
for years and years. There is a lot to learn with
excavation, as you'll need to know how to run
machinery, shoot grade, and how to properly dig
holes and trenches so they won't cave in.

Backhoe Loader Equipment

2009-10-23T23:16:00.000-07:00

Also referred to as a loader backhoe, the backhoe loader is an engineering and excavation vehicle that consists of a tractor, front shovel and bucket and a small backhoe in the rear end. Due to the small size and versatility, backhoe loaders are common with small construction projects and excavation type work.

Originally invented in Burlington Iowa back in 1857, the backhoe loader is the most common variation of the classic farm tractor. As the name implies, it has a loader assembly on the front and a backhoe attachment on the back.

Anytime the loader and backhoe are attached it is never referred to as a tractor, as it is not normally used for towing and doesn't normally have a PTO. When the backhoe is permanently attached, the machine will normally have a seat that can swivel to the rear to face the backhoe controls. Any type of removable backhoe attachments will normally have a seperate seat on the attachment itself.

Backhoe loaders are common and can be used for many tasks, which include construction, light transportation of materials, powering building equipment, digging holes and excavating, breaking asphalt, and even paving roads.

You can often replace the backhoe bucket with other tools such as a breaker for breaking and smashing concrete and rock. There are some loader buckets that offer a retractable bottom, which enable it to empty the load more quickly and efficiently.

The retractable bottom loader buckets are often times used for grading and scratching off sand. The front assembly on a backhoe may be either removable or permanently attached. Often times, the bucket can be replaced with other tools or devices. In order to mount different attachments to the loader, it must be equipped with a tool coupler. The coupler consists of two hydraulic cylinders on the end of the arm assembly, which can expand and retract to allow different tools to be attached to the unit.

There are several types of backhoe loader brands, including New Holland, John Deere, and Case. Some will offer you cabs, while others won't. The newer types of backhoe loaders even offer you air conditioning, radios, and other accessories that make you feel like you are working with luxury.

Common with excavating jobs, the backhoe can serve many purposes. It can haul equipment and supplies in the loader bucket. Another great use is to cover up dirt when filling in trench lines or covering up pipe that was just put in the ground. The backhoe attachment at the rear is ideal for digging water pipes and sewer pipes.

The best thing about the backhoe loader is the fact that they are easy to operate. You don't need to be a rocket scientist to fully operate this nifty piece of equipment.

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Dump Trucks - Heavy Equipments And Machinery!

2009-10-21T23:55:00.000-07:00

Dump trucks or production trucks are those that are
used for transporting loose material such as sand,
dirt, and gravel for construction. The typical dump
truck is equipped with a hydraulically operated open
box bed hinged at the rear, with the front being
able to be lifted up to allow the contents to fall
out on the ground at the site of delivery.

Dump trucks come in many different configurations
with each one specified to accomplish a specific
task in the construction chain.

Standard dump truck
The standard dump truck is a full truck chassis with
the dump body mounted onto the frame. The dump body
is raised by a hydraulic ram lift that is mounted
forward of the front bulkhead, normally between the
truck cab and the dump body.

The standard dump truck also has one front axle,
and one or more rear axles which normally has dual
wheels on each side. The common configurations for
standard dump trucks include the six wheeler and
ten wheeler.

Transfer dump truck
For the amount of noise made when transferring, the
transfer dump truck is easy to recognize. It's a
standard dump truck that pulls a separate trailer
which can be loaded with sand, asphalt, gravel,
dirt, etc.

The B box or aggregate container on the trailer is
powered by an electric motor and rides on wheels
and rolls off of the trailer and into the main dump
box. The biggest advantage with this configuration
is to maximize payload capacity without having to
sacrifice the maneuverability of the short and
nimble dump truck standards.

Semi trailer end dump truck
The semi end dump truck is a tractor trailer
combination where the trailer itself contains the
hydraulic hoist. The average semi end dump truck
has a 3 axle tractor that pulls a 2 axle semi
trailer. The advantage to having a semi end
dump truck is rapid unloading.

Semi trailer bottom dump truck
A bottom dump truck is a 3 axle tractor that pulls
a 2 axle trailer with a clam shell type dump
gate in the belly of the trailer. The biggest
advantage of a semi bottom dump truck is the
ability to lay material in a wind row. This
type of truck is also maneuverable in reverse as
well, unlike the double and triple trailer
configurations.

Double and triple trailer
The double and triple bottom dump trucks consist
of a 2 axle tractor pulling a semi axle semi
trailer and an additional trailer. These types of
dump trucks allow the driver to lay material in
wind rows without having to leave the cab or stop
the truck. The biggest disadvantage is the
difficulty in going in reverse.

Side dump trucks
Side dump trucks consist of a 3 axle trailer pulling
a 2 axle semi trailer. It offers hydraulic rams
that tilt the dump body onto the side, which spills
the material to the left or right side of the
trailer. The biggest advantages with these types
of dump trucks are that they allow rapid unloading
and carry more weight than other dump trucks.

In addition to this, side dump trucks are almost
impossible to tip over while dumping, unlike the
semi end dump trucks which are very prone to being
upset or tipped over. The length of these trucks
impede maneuverability and limit versatility.

Off road dump trucks
Off road trucks resemble heavy construction equipment
more than they do highway dump trucks. They are
used strictly for off road mining and heavy dirt
hauling jobs, such as excavation work. They are
very big in size, and perfect for those time when
you need to dig out roads and need something to
haul the massive amounts of dirt to another
location.

Types Of Backhoe Loaders

2009-10-19T23:53:00.000-07:00

Different Types Of Backhoe Loaders

Caterpillar
Caterpillar hit a dial of power and performance with
its top of the line 446 backhoe loader when it first
introduced the D series version of the machine. The
102 HP machine also features a new operator station
and offers optional joystick controls. The dig
forces on the bucket have increased 10% on the
backhoe.

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.

Cranes - Type Of Cranes

2009-10-18T23:48:00.000-07:00

Cranes A crane is a tower or derrick that is equipped with cables and pulleys that are used to lift and lower material. They are commonly used in the construction industry and in the manufacturing of heavy equipment. Cranes for construction are normally temporary structures, either fixed to the ground or mounted on a purpose built vehicle.

They can either be controlled from an operator in a cab that travels along with the crane, by a push button pendant control station, or by radio type controls. The crane operator is ultimately responsible for the safety of the crews and the crane.

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 refered 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.

Trenches Vs Compact Excavators - Compare Machines!

2009-10-17T23:41:00.000-07:00

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 machines, 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.

Compact Excavators - Machinery & Equipments!

2009-10-16T23:37:00.000-07:00

The compact hydraulic excavator can be a tracked or wheeled vehicle with an approximate operating weight of 13,300 pounds. Normally, it includes a standard backfill blade and features an independent boom swing. The compact hydraulic excavator is also known as a mini excavator.

A compact hydraulic excavator is different from other types of heavy machinery in the sense that all movement and functions of the machine are accomplished through the transfer of hydraulic fluid. The work group and blade are activated by hydraulic fluid acting upon hydraulic cylinders. The rotation and travel functions are also activated by hydraulic fluid powering hydraulic motors.

Most types of compact hydraulic excavators have three assemblies - house, undercarriage, and the work group.

House
The house structure contains the compartment for the operator, engine compartment, hydraulic pump and also the distribution components. The house structure is attached to the top of the undercarriage via swing bearing. Along with the work group, the house is able to rotate upon the undercarriage without limit due to a hydraulic distribution valve that supplies oil to the undercarriage components.

undercarriage
The undercarriage of compact excavators consists of rubber or steel tracks, drive sprockets, rollers, idlers, and associated components and structures. The undercarriage is also home to the house structure and the work group.

Work group
The work group consists of the boom, dipper or arm, and attachment. It is connected to the front of the house structure via a swinging frame that allows the work group to be hydraulically pivoted left or right in order to achieve offset digging for trenching parallel with the tracks. Independent boom swing

The purpose of the boom swing is for offset digging around obstacles or along foundations, walls, and forms. Another use is for cycling in areas that are too narrow for cab rotation. Another major advantage of the compact excavator is the independent boom swing.

Backfill blade
The backfill blade on compact excavators are used for grading, leveling, backfilling, trenching, and general dozer work. The blade can also be used to increase the dumping height and digging depth depending on it's position in relation to the workgroup.

The most common place you'll find compact excavators is in residential dwellings. When digging phone lines or other things, these pieces of equipment are very common for getting between houses. Due to their small size, they can fit almost anywhere.

Over the years, the capabilities for compact excavators have expanded far beyond the tasks of excavation. With hydraulic powered attachments such as breakers, clamps, compactors and augers, the compact excavator is used with many other applications and serves as an effective attachment tool as well. Serving many purposes, the compact excavator is a great addition to any job that requires the use of machinery.

Bulldozers - Excavation Equipment

2009-10-15T23:33:00.000-07:00

The bulldozer is a very powerful crawler that is equipped with a blade. The term bulldozer is often used to mean any type of heavy machinery, although the term actually refers to a tractor that is fitted with a dozer blade.

Often times, bulldozers are large and extremely powerful tracked vehicles. The tracks give them amazing ground mobility and hold through very rough terrain. Wide tracks on the other hand, help to distribute the weight of the dozer over large areas, therefore preventing it from sinking into sandy or muddy ground.

Bulldozers have great ground hold and a torque divider that's designed to convert the power of the engine into dragging ability, which allows it to use its own weight to push heavy objects and even remove things from the ground. Take the Caterpillar D9 for example, it can easily tow tanks that weight more than 70 tons. Due to these attributes, bulldozers are used to clear obstacles, shrubbery, and remains of structures and buildings.

The blade
The blade on a bulldozer is the heavy piece of metal plate that is installed on the front. The blade pushes things around. Normally, the blade comes in 3 varieties:

1. A straight blade that is short and has no lateral curve, no side wings, and can be used only for fine grading.
2. A universal blade, or U blade, which is tall and very curved, and features large side wings to carry more material around.
3. A combination blade that is shorter, offers less curvature, and smaller side wings.

Modifications
Over time, bulldozers have been modified to evolve into new machines that are capable of things the original bulldozers weren't. A good example is that loader tractors were created by removing the blade and substituting a large volume bucket and hydraulic arms which will raise and lower the bucket, therefore making it useful for scooping up the earth and loading it into trucks.

Other modifications to the original bulldozer include making it smaller to where it can operate in small working areas where movement is very limited, such as mining caves and tunnels. Very small bulldozers are known as calfdozers.

History
The first types of bulldozers were adapted from farm tractors that were used to plough fields. In order to dig canals, raise earth dams, and partake in earthmoving jobs, the tractors were equipped with a thick metal plate in the front. Later on, this thick metal plate earned the name blade.

The blade of the bulldozer peels layers of soil and pushes it forward as the tractor advances. The blade is the heart and soul of the bulldozer, as it was the first accessory to make full use for excavation type jobs. As the years went by, when engineers needed equipment to complete larger jobs, companies such as CAT, Komatsu, John Deere, Case, and JCB started to manufacture large tracked earthmoving equipment. They were very loud, very large, and very powerful and therefore earned the nickname "bulldozer".

Over the years, the bulldozers got bigger, more powerful, and even more sophisticated. The important improvements include better engines, more reliable drive trains, better tracks, and even hydraulic arms that will enable more precise manipulation of the blade and automated controls. As an added option, bulldozers can come equipped with a rear ripping claw to break up pavement or loosen rocky soil.

The best known manufacturer of bulldozer is CAT, which has earned a vast reputation for making tough and durable, yet reliable machines. Even though the bulldozer started off a modified farm tractor, it rapidly became one of the most useful pieces of equipment with excavating and construction.

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Machines And Machinery: Definition & Info!

2009-10-05T23:18:00.000-07:00

Machine, Machinery, Machines

Machine is the devise that comprises of the stationary parts and moving parts combined together to generate, transform or utilize the mechanical energy. All the machines are made up of elements or parts and units. Each element is a separate part of the machine and it may have to be designed separately and in assembly. Each element in turn can be a complete part or made up of several small pieces which are joined together by riveting, welding etc. Several machine parts are assembled together to form what we call as complete machine. Or more specifically any mechanical or electrical device that transmits or modifies energy to perform or assist in the performance of human tasks.

Classification of Machines

Considering the various applications of the machines, they are classified into three main types, these are:

Machines generating mechanical energy:

The machines generating mechanical energy are also called as prime movers. These machines convert some form of energy like heat, hydraulic, electrical, etc into mechanical energy or work. The most popular example of these machines is the internal combustion engine in which the chemical energy of the fuel is converted into heat energy which in turn is converted into mechanical work in the form of the rotation of the wheels of the vehicle. Some other examples of this group of machines are gas turbines, water turbines, steam engine etc.

Machines transforming mechanical energy:

These machines are called converting machines because they convert mechanical energy into other form of energy like electricity, hydraulic energy etc. Some examples of these machines are electric generator in which the rotation of the shaft is converted into electrical energy, and hydraulic pump in which the rotation energy of the rotors is converted into the hydraulic energy of the fluid.

Machines utilizing mechanical energy:

These machines receive mechanical energy and utilize it for various applications. Some examples of these machines are lathe machine that utilizes the mechanical energy to cut metals and washing machine that utilizes the rotation of the rotor for washing the clothes.