HOMEMADE COILGUN PDF

Power is supplied to the electromagnet from some sort of fast discharge storage device, typically a batteryor high-capacity high voltage capacitors one per electromagnetdesigned for fast energy discharge. Coilguns generally consist of one or more coils arranged along a barrel, so the path of the accelerating projectile lies along the central axis of the coils. Archived from the original on July 8, However, the practical construction of such arrangements requires the provision of reliable high speed sliding contacts. These systems are very quiet when projectiles are fired at velocities lower than the speed of sound, are clean, and require little maintenance.

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I also wrote this quick explanation for my science fair if anyone wants it: How it works The aluminium projectile is pushed down the barrel, in between the two fake Perspex rails 4. With the projectile in this position the railgun is circuit is not complete, allowing the capacitors to be charged.

The DC power supply 10 is connected to the capacitor banks. When the power supply is switched on, it places a voltage across the capacitors which the capacitors store. When the capacitors reach the desired voltage as measured by the voltmeter 5 , switch 1 13 is pressed to stop the charging. The ball valve of the pressure chamber 6 is closed, and 20 psi is pumped into the chamber as measured by the pressure valve. The camera 15 is made to begin recording at fps.

The ball valve is opened by hand as quickly as possible. Air flows through the hose 17 , into the rail gun, which pushes the projectile forwards. Eventually the projectile comes into contact with the conductive aluminium rails 3. At this point the circuit is complete, and the capacitors discharge.

Because the projectile passes in front of a board with 10cm increments on it 1 , the velocity of the projectile can easily be determined by reviewing the high speed footage.

The purpose of lightbulb 2 12 is as a bleeder resistor. In the event that the railgun misfires, and the capacitors are charged to a dangerous voltage, the capacitors can be safely discharged by pressing switch 2 This allows the energy in the capacitors to be discharged through the lightbulb.

The air injection system 6 is required so that the projectile contacts the rails with some initial velocity. Otherwise, there is a significant chance that the projectile may be spot-welded to the rails. Add Tip.

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This website is my engineering notebook. Read the slides for Magnetic Launches - Hands-on Ideas 10 , my presentation about coilguns on May 22, As of this website supports SSL. Let me know if you spot anything broken or just plain strange. Current projects: Click here to see my latest coilgun, my best coilgun or my levitator.

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They use a current to charge copper wires and create an electromagnet to launch a projectile. To build a coil gun, all you need are a few tools, some wire, and a disposable camera. All rights reserved. This image may not be used by other entities without the express written consent of wikiHow, Inc. Remove the paper layer from the disposable camera and locate the tabs on the bottom and sides of the casing.

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HOMEMADE COILGUN PDF

I also wrote this quick explanation for my science fair if anyone wants it: How it works The aluminium projectile is pushed down the barrel, in between the two fake Perspex rails 4. With the projectile in this position the railgun is circuit is not complete, allowing the capacitors to be charged. The DC power supply 10 is connected to the capacitor banks. When the power supply is switched on, it places a voltage across the capacitors which the capacitors store.

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