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Registered Member #1465
Joined: Sun May 04 2008, 10:41AM
Location:
Posts: 3
Hey everyone. I built this one afternoon, it's quite crude :D
It currently uses 4 photoflash (all 330v) capacitors; 2x 160 uF and 2x 80uF all hooked in parallel. The bank stores 33 J of energy. The charging circuit is ripped directly from a flash camera and the trigger was a switch from an old washing machine I believe. It uses 1x AA battery takes 15-20s to charge and it can fire a one inch segment of nail that fits inside a drinking straw up to my ceiling from the ground. It's speed is not very fast probably not muchgreater than 10 m/s if that. If anyone has suggestions on how I could improve it's efficiency, it would be a great help.
Registered Member #1430
Joined: Sun Apr 06 2008, 11:12AM
Location: Ã…rhus, Denmark
Posts: 102
i don't get it. i tried building a coilgun with 1,2,4 and 8 photoflash capacitors and 5 different coils but i just cant get the projectile to fly furter than 2-3 meters.
Registered Member #952
Joined: Mon Aug 13 2007, 11:07AM
Location: Finland
Posts: 388
High-Voltage, that's certainly a very nice looking one
Solidacid, here are some reasons for poor efficiency in coilguns: - Too many turns on the coil -> low peak current - Projectile weight and starting place not optimal - this is the most important thing to experiment with - Poor switch (use a SCR)
Take a look at for more information on tuning the gun.
I got a projectile of a few grams to fly about 10 metres with my 8 photoflash cap bank.
Registered Member #1062
Joined: Tue Oct 16 2007, 02:01AM
Location:
Posts: 1529
with only 33J, you only need a small SCR, the regular transistor looking one is fine.
will work, it has high enough ratings to expand your cap bank. Make sure you dont hard short the caps through this, and put a diode antiparrallel with the coil (to be on the safe side).
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33 J coilgun
If anyone has suggestions on how I could improve it's efficiency, it would be a great help.
