1. Machine Guns By : By : Abu Mohammed Shaukath Abu Mohammed Shaukath 020107004, S 7 Mechanical 020107004, S 7 Mechanical

2. Introduction Most amazing, yet brutal discovery of 19 th Century. Most amazing, yet brutal discovery of 19 th Century. Remarkable product of precision engineering. Remarkable product of precision engineering.

3. Basics Apply explosive pressure behind a projectile to launch it down a barrel. Apply explosive pressure behind a projectile to launch it down a barrel. Earliest, and simplest, application of this idea is the cannon Earliest, and simplest, application of this idea is the cannon

4. 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. A combination of a projectile (the bullet), a propellant (gunpowder, for example) and a primer (the explosive cap), all contained in one metal package.

5. THE FIRST STEP TOWARDS AUTOMATION-Revolver Initially, the trigger lever pushes the hammer backward. Initially, the trigger lever pushes the hammer backward. As it moves backward, the hammer compresses a metal spring in the gun stock (the handle). 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. At the same time, the trigger rotates the cylinder so the next breech chamber is positioned in front of the gun barrel.

6. THE FIRST STEP TOWARDS AUTOMATION-Revolver (Contd) When you pull the trigger all the way back, the lever releases the hammer. When you pull the trigger all the way back, the lever releases the hammer. The compressed spring drives the hammer forward. The compressed spring drives the hammer forward. The hammer slams into the primer at the back of the cartridge, igniting the primer. The hammer slams into the primer at the back of the cartridge, igniting the primer. The primer sets off the propellent. The primer sets off the propellent. The exploding propellent drives the bullet out of the gun at high speed. The exploding propellent drives the bullet out of the gun at high speed.

7. The Machine Gun Gatling Gun- Most older and popular design. Gatling Gun- Most older and popular design.

8. 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. 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: There are three basic mechanisms for harnessing this power: 1)Recoil systems 1)Recoil systems 2)Blowback systems 2)Blowback systems 3)Gas mechanisms 3)Gas mechanisms

9. Recoil System A locking mechanism holds together the barrel and the breach bolt. A locking mechanism holds together the barrel and the breach bolt. Bolt and the barrel can move freely in the gun housing Bolt and the barrel can move freely in the gun housing

10. Blowback System When the trigger is pulled, the sear releases the bolt, and the spring drives it forward. 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 After the bolt chambers the cartridge, the firing pin sets off the primer, which ignites the propellant

11. Blowback System 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. 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.

12. Gas System Similar to Blowback system. Similar to Blowback system. The main addition is a narrow piston, attached to the bolt, that slides back and forth in a cylinder positioned above the gun barrel The main addition is a narrow piston, attached to the bolt, that slides back and forth in a cylinder positioned above the gun barrel

13. Automatic BULLET FEED

14. 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. 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. 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.

15. Thank You…