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LEVER

The simplest machine, and perhaps the one with which you are most familiar, is the lever. A seesaw is a familiar example of a lever in which one weight balances the other.balances the other.
You will find that all levers have three basic parts:the fulcrum (F), a force or effort (E), and a resistance(R). Look at the lever in pic . You see the pivotal point (fulcrum) (F); the effort (E), which is applied at a distance (A) from the fulcrum; and a resistance (R), which acts at a distance (a) from the fulcrum. Distances A and a are the arms of the lever.

CLASSES OF LEVERS:.
The location of the fulcrum (the fixed or pivot point) in
relation to the resistance (or weight) and the effort
determines the lever class

 

Crowbars, shears, and pliers are common examples of first class of levers

INTRODUCTION ABOUT MACHINES

As you look about you, you probably see half a
dozen machines that you don’t recognize as such.
Ordinarily you think of a machine as a complex
device-a gasoline engine or a typewriter. They are
machines; but so are a hammer, a screwdriver, a ship’s
wheel. A machine is any device that helps you to do
work. It may help by changing the amount of force or
the speed of action. A claw hammer, for example, is a
machine. You can use it to apply a large force for pulling
out a nail; a relatively small pull on the handle produces
a much greater force at the claws.
We use machines to transform energy. For example,
a generator transforms mechanical energy into electrical
energy. We use machines to transfer energy from one
place to another. For example, the connecting rods,
crankshaft, drive shaft, and rear axle of an automobile
transfer energy from the engine to the rear wheels.
Another use of machines is to multiply force. We
use a system of pulleys (a chain hoist, for example) to
lift a heavy load. The pulley system enables us to raise
the load by exerting a force that is smaller than the
weight of the load. We must exert this force over a
greater distance than the height through which the load
is raised; thus, the load will move slower than the chain
on which we pull. The machine enables us to gain force,
but only at the expense of speed.
Machines may also be used to multiply speed. The
best example of this is the bicycle, by which we gain
speed by exerting a greater force.
Machines are also used to change the direction of a
force. For example, the Signalman’s halyard enables
one end of the line to exert an upward force on a signal
flag while a downward force is exerted on the other end.
There are only six simple machines: the lever, the
block, the wheel and axle, the inclined plane, the screw,
and the gear. Physicists, however, recognize only two
basic principles in machines: those of the lever and the
inclined plane. The wheel and axle, block and tackle,
and gears may be considered levers. The wedge and the
screw use the principle of the inclined plane.
When you are familiar with the principles of these
simple machines, you can readily understand the operation of complex machines. Complex machines are merely combinations of two or more simple machines. Next post we will discuss about LEVERS,,,

no mech, no world... Know mech, Know world...!!!

VTEC

VTEC (Variable Valve Timing and Lift Electronic Control) is a valvetrain system developed by Honda to improve the volumetric efficiency of a four-stroke internal combustion engine. This system uses two camshaft profiles and electronically selects between the profiles. It was invented by Honda, and was the first system of its kind. Different types of variable valve timing and lift control systems have also been produced by other manufacturers (MIVEC from Mitsubishi, AVCS from Subaru, VVTL-i from Toyota, VarioCam Plus from Porsche, VVC from Rover Group, VVEL from Nissan, etc.). it is somewat interesting and our mechanical is moving towards the concept of complete electrification,,,,aware,,

FOUR STROKE ENGINE,,,,,

3D ANIMATION ABOUT THE WORKING OF FOUR STROKE INGINE,,THE HERO OF THE ENGINE IS THE CYLINDER,,,IN WHICH THE LINEAR MOTION OF CONNECTING ROD DUE TO THE COMBUSTION AND EXPANSION PROPERTY OF GASOLINE(DIESEL,HYDROGEN) IS CONVERTED INTO THE  ROTATIONAL MOTION BY CONNECTING IT TO THE CRANKSHAFT,,THEN via TRANSMISSION AND GEARS THE KINETIC ENERGY IS TRANSFERED TO WHEELS,,,AND WE ENJOYS THE TRAVEL,,,REALLY INTERESTING,,,NOADAY HYBRID CARS ARE ON THE ROADS WHICH MAKES USE OF ELECTRIC MOTIR TOO FOR THE TRANSMISSION
VISIT http://mskmechanical.blogspot.com/2010/12/gasoline-power-vs.html FOR DETAILS,,,

Internal Combustion

The ­principle behind any reciprocating internal combustion engine: If you put a tiny amount of high-energy fuel (like gasoline) in a small, enclosed space and ignite it, an incredible amount of energy is released in the form of expanding gas. You can use that energy to propel a potato 500 feet. In this case, the energy is translated into potato motion. You can also use it for more interesting purposes. For example, if you can create a cycle that allows you to set off explosions like this hundreds of times per minute, and if you can harness that energy in a useful way, what you have is the core of a car engine!