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Connecting the coil and circuit in coilgun Answered

When i connect the coil with the circuit, there spark in the switch. Is it because the switch doesn't strong enough ? The projectile didn't fly.

4 Replies

phalanx447 (author)2009-05-03

Could you give a little bit more information on your circuit? Did you use a relay in your trigger circuit like advised in this instructable: https://www.instructables.com/id/Coilgun-Handgun/

I've built one before, so I'll do my best to help. The more information or pictures you can provide, the better.

When mine sparked at the switch, it was because there was a tiny gap where the wires from the capacitors connected to the relay prongs. Check and make sure that they're set firmly in place. Also, look for any exposed wires, especially at junctions made in the circuit. If there are close together or touching, you sill short your circuit before it gets to the coil- resulting in your spark, a loud bang, and your projectile not flying.

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shinizaki (author)phalanx4472009-05-04

This the picture of my switch and circuit. The switch rated 6A and 250V

Sorry if ask this, what is the relay's function ? I am still new in this so i don't know much. I use coil-switch-circuit direct connection. Is the the switch good enough ? Or i need relay ?

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phalanx447 (author)shinizaki2009-05-07

So sorry I dissapeared on you. I had exams, but now that they're done, I'm back. Thanks for the pictures. Here's what I have for you. It probably is your switch. A relay will fix the problem. Here's how one works- sorry in advance for the picture's quality, I'm not too stable with a track pad. The image of the relay's insides- what it is is two partial circuits. One side is a coil what produces a magnetic field when electricity runs through it, just like your gun's. The other is an open metal switch that, when the coil makes the magnetic field, the swtich closes. This would make the electricity in your circuit go from the capacitor straight to the joil, rather than through the switch, which would be acting like a crimp in a hose with a lot of water flowing through it. How you would set it up into your circuit is the other image- A is your relay. B is your current switch. See how it's part of a whole new circuit? Fewer kinks for your electricity to go through. The Relay does need a battery in it, hence the 9v. C is your circuit- the relay should be between the positive end of the capacitor and the coil. D is your coil. I'm afraid I don't have YIM, but I will be around the next few days. Good luck!

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phalanx447 (author)phalanx4472009-05-07

Oops! The pictures where the wrong format! Let's try that again.

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