03-03-2011, 03:21 PM
presentedby:
Biswajith rath
Introduction
• Most amazing, yet brutal discovery of 19th Century.
• Remarkable product of precision engineering.
Basics
• Apply explosive pressure behind a projectile to launch it down a barrel.
• Earliest, and simplest, application of this idea is the cannon
Cannon
Modern Bullet
• A combination of a projectile (the bullet), a propellant (gunpowder, for example) and a primer (the explosive cap), all contained in one metal package.
THE FIRST STEP TOWARDS AUTOMATION-Revolver
• Initially, the trigger lever pushes the hammer backward.
• As it moves backward, the hammer compresses a metal spring in the gun stock (the handle).
• At the same time, the trigger rotates the cylinder so the next breech chamber is positioned in front of the gun barrel.
• When you pull the trigger all the way back, the lever releases the hammer.
• The compressed spring drives the hammer forward.
• The hammer slams into the primer at the back of the cartridge, igniting the primer.
• The primer sets off the propellant.
• The exploding propellant drives the bullet out of the gun at high speed.
The Machine Gun
• Gatling Gun- Most older and popular design.
Fully Automatic Machine Gun
• Fully automatic machine gun use the power of the cartridge explosion to reload and re-cock the gun after each shot.
• There are three basic mechanisms for harnessing this power:
1)Recoil systems
2)Blowback systems
3)Gas mechanisms
• Recoil System
• A locking mechanism holds together the barrel and the breach bolt.
• Bolt and the barrel can move freely in the gun housing
Blowback System
• When the trigger is pulled, the sear releases the bolt, and the spring drives it forward.
• After the bolt chambers the cartridge, the firing pin sets off the primer, which ignites the propellant
• The explosive gas from the cartridge drives the bullet down the barrel. At the same time, the gas pressure pushes in the opposite direction, forcing the bolt backward.
Gas System
• Similar to Blowback system.
• The main addition is a narrow piston, attached to the bolt, that slides back and forward in a cylinder positioned above the gun barrel
Mechanism for auto bullet feed
• Spring operated magazine
• Ammunition hopper
• Ammunition bullet feed
• Mostly the 3rd mechanism is used for auto bullet feeding because it can hold a relatively high amount of ammunition compared to other 2 mechanism.
Automatic BULLET FEED
Advantages
• It could deliver heavy amount of gunfire in shorter time.
• Less man monitoring is required.
• Accuracy is more compare to other guns.
• It can hit the target from a great distance.
Disadvantages
• Difficulties arises when the gun is moved from one place to another place due to it’s heavy weight.
• Longer reload time.
• It’s get overheated.
Conclusion
• Machine gun had been one of the most important military developments in the history of man. It has been the reason behind the fall of many nations, repressing revolutions, overthrowing governments and ending wars.
• Gun manufacturers are continually adding new modifications to machine guns, but the basic mechanism has remained the same for more than a hundred years. Some of the modern machine guns can be fired using a remote control.
Biswajith rath
Introduction
• Most amazing, yet brutal discovery of 19th Century.
• Remarkable product of precision engineering.
Basics
• Apply explosive pressure behind a projectile to launch it down a barrel.
• Earliest, and simplest, application of this idea is the cannon
Cannon
Modern Bullet
• A combination of a projectile (the bullet), a propellant (gunpowder, for example) and a primer (the explosive cap), all contained in one metal package.
THE FIRST STEP TOWARDS AUTOMATION-Revolver
• Initially, the trigger lever pushes the hammer backward.
• As it moves backward, the hammer compresses a metal spring in the gun stock (the handle).
• At the same time, the trigger rotates the cylinder so the next breech chamber is positioned in front of the gun barrel.
• When you pull the trigger all the way back, the lever releases the hammer.
• The compressed spring drives the hammer forward.
• The hammer slams into the primer at the back of the cartridge, igniting the primer.
• The primer sets off the propellant.
• The exploding propellant drives the bullet out of the gun at high speed.
The Machine Gun
• Gatling Gun- Most older and popular design.
Fully Automatic Machine Gun
• Fully automatic machine gun use the power of the cartridge explosion to reload and re-cock the gun after each shot.
• There are three basic mechanisms for harnessing this power:
1)Recoil systems
2)Blowback systems
3)Gas mechanisms
• Recoil System
• A locking mechanism holds together the barrel and the breach bolt.
• Bolt and the barrel can move freely in the gun housing
Blowback System
• When the trigger is pulled, the sear releases the bolt, and the spring drives it forward.
• After the bolt chambers the cartridge, the firing pin sets off the primer, which ignites the propellant
• The explosive gas from the cartridge drives the bullet down the barrel. At the same time, the gas pressure pushes in the opposite direction, forcing the bolt backward.
Gas System
• Similar to Blowback system.
• The main addition is a narrow piston, attached to the bolt, that slides back and forward in a cylinder positioned above the gun barrel
Mechanism for auto bullet feed
• Spring operated magazine
• Ammunition hopper
• Ammunition bullet feed
• Mostly the 3rd mechanism is used for auto bullet feeding because it can hold a relatively high amount of ammunition compared to other 2 mechanism.
Automatic BULLET FEED
Advantages
• It could deliver heavy amount of gunfire in shorter time.
• Less man monitoring is required.
• Accuracy is more compare to other guns.
• It can hit the target from a great distance.
Disadvantages
• Difficulties arises when the gun is moved from one place to another place due to it’s heavy weight.
• Longer reload time.
• It’s get overheated.
Conclusion
• Machine gun had been one of the most important military developments in the history of man. It has been the reason behind the fall of many nations, repressing revolutions, overthrowing governments and ending wars.
• Gun manufacturers are continually adding new modifications to machine guns, but the basic mechanism has remained the same for more than a hundred years. Some of the modern machine guns can be fired using a remote control.
