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Registered Member #314
Joined: Mon Mar 13 2006, 03:12AM
Location:
Posts: 52
Right now I am useing 1-2, 9 volt batteries. and i'm experimenting with 450 volt 22 uF capacitors. The coils i'm experimenting with are 12 turn, 4 layer. and made out of 24 AWG multistrand wire. I doubt that their strong enough to do much of anything. when i put power through it it's capable of moveing a wood screw about helf a centimeter. I've been looking online for magnet wire, and better capacitors. But before I buy anything I want to get something that kinda works.
Registered Member #215
Joined: Sun Feb 19 2006, 09:14PM
Location:
Posts: 30
450v @ 22uF isn't really a lot of energy:
Your cap = 2.2275 joules
Basic photoflash cap = 4.356 joules
So even a single modest photoflash cap would store more energy. How many of your caps do you have? A few in parellel would be perfect for shooting a small screw or nail.
Coils sound about right for a first CG.
wrote ... Don't give the roadmap; make him dig a little. That's the only way he'll truly learn
Thats pretty much how I was introduced. People gave me basic information and I did all the research and homework until I felt confortable with it
Registered Member #314
Joined: Mon Mar 13 2006, 03:12AM
Location:
Posts: 52
so i'm not so far off!!! thats good to hear. I found a transformer from an old CNC machine i used to have and it converts 24 volts to 12 volts, so hopefully i can use this to either A. provide a steady power supply for the 555 timer and charging circuit. or B. use it to step up the voltage. Right now i can get the screw to move a little, and thats only with 3 volts, cant wait to see what it'll do with 400!! :)
Registered Member #233
Joined: Wed Feb 22 2006, 09:06AM
Location: Dortmund, Germany
Posts: 7
... wrote ...
I am kind of reluctant to give information here for fear that Yohan might deem it inappropriate, but to charge a capacitor you need to connect both terminals to a dc source. Because for most coil guns you need several hundred volts batteries get expensive/bulkley, so most people turn to different charging methods. For a beginner coilgun I recommend taking to small 120v->12v transformers and hooking the 12v sides of the first one to the 12v side of the other one, then plugging the first one in so you get a relatively low current 120vac on the output. From there you can full wave rectify it to give about 170v, add a doubler to get 330v, or a tripler to get a little over 500v. Do not think of plugging a cap strait into a wall outlet. Just be safe about it.
Here in Germany where we have 230VAC @ 50Hz I just use a 60W Light Bulb and a diode to charge my caps. The 60W bulb as a limiting resistor and the diode to get the positive part of the sine wave and therefor the RMS of 230VAC which is ~ 1,4 * 230VAC
Registered Member #111
Joined: Fri Feb 10 2006, 01:04AM
Location: Menasha,Wisconsin
Posts: 65
the only thing i can say about giving him all the answers is, when i started, i had no resources to go by. i experimented, and shocked myself enough to stop for a while. while i am still rather new at this, dont let your egos get in the way of helping him out. for instance help hime with a boost converter. even the theory is confusing to me still and i have made a few.
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need assistance on my first coil gun
