Old 02-16-2011, 05:28 PM #161
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Default Re: Halo Style 2 stage COILGUN

Well, I can finally start moving forward with my coilgun The boost converter I was working on is now working. I had switched two wires somehow on the mosfet. A rather simple mistake but it took retracing every connection to figure out what I had done wrong.

This one will end up making it into the coilgun. Next step is designing the frame and molding it. Using ABS plastic for this one.

If anyone is curious and unaware on plastic molding, get some black sewer pipe from your local hardware store. Cut a section out, and place in your oven at around 300 degrees. Place it on top of some aluminum foil, (preferably as smooth as possible) make a wire frame (any wire will do that's strong enough to support the weight of a wet towel + the plastic)

Watch the plastic in the oven, it will soften and sag. When it is flat on the foil, take it out of the oven (make certain the windows are open with a fan blowing) this will give off fumes. You need to have a cold wet towel over your wire frame, and flip the hot plastic onto it. (oven mitts are a must of course) the cold water will harden it fairly quickly, and you have a plastic shell the shape of the wire frame and towel. You can do this outside with a toaster oven if the sections you are using are small enough sections of plastic to fit inside it.

You will need to sand out lumps and sand off any undesired markings, then give it a light buffing with a soft buffing wheel. Any sort of nice balloon buff should work well for a final polish on the black plastic, using any sort of fine metal polish buffing compound.


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Old 02-16-2011, 05:30 PM #162
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Default Re: Halo Style 2 stage COILGUN

ha! Another coilgunner. We're getting big uh?
Thanks for the tips on ABS molding. It could be useable to me..
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Old 02-16-2011, 07:24 PM #163
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Default Re: Halo Style 2 stage COILGUN

Sounds interesting.
When will we see first pics of your housing? ^^

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Old 02-17-2011, 10:06 AM #164
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Default Re: Halo Style 2 stage COILGUN

My bullpup rifle failed to achieve any more power at 3000uF. In fact it was weaker(must have created a longer pulse somehow). *scratches head* So I removed those capacitors to return it to 2450uF and power returned. I know I said that I would post a video, but there are a few more features that I want to add while moving up to the 2 stage design. So far I have installed an aluminum tube over most of the epoxy tube, for additional mechanical strength to prevent breaking. I'm also going to add an imitation muzzle break/sight to give it a paramilitary look.

I will add a machine gun green canvas strap for the weight which is ~ 2 kilos and to make it look cool. Law enforcement would shoot first and ask questions later, if I was walking around in public. ^^ I'm trying to think of a name for it while looking at the website coilgun.ru
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Old 02-17-2011, 11:22 AM #165
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Default Re: Halo Style 2 stage COILGUN

Did you make a new 2D model of your housing? Always curious when it comes to the looks ^^

Regarding loss of power: You have more capacity, but the very same coil...so the pulse is longer. Maybe the charger is too weak as well, and wont charge to 350...maybe only 280V...even longer pulse would be the result.

Remove 1 layer and try again! ;-)
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Old 02-17-2011, 12:42 PM #166
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Default Re: Halo Style 2 stage COILGUN

I'm not an expert but, more capacitance usually results in longer pulses. Isn't making more stages with 3000uF better?
suggestion: Bullpup-MR-3000
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Old 02-17-2011, 03:34 PM #167
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Default Re: Halo Style 2 stage COILGUN

Thats right...decreasing numbers of layer would even that out....a bit.

In general its like, the more stages, the more efficient it gets...depends on pulse-durations of course.
I am not a fan of those SCR V-switches, because 30% of the pulse is wasted. Same with moving the coils further away from the contacts/gates...
makes no sense.
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Old 02-17-2011, 03:36 PM #168
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Default Re: Halo Style 2 stage COILGUN

makes no sense 400v @ 300uF having 100% power, and 400v @ 3000uF having 1000% power. I think that another stage to use the remaining charge would be better..
dunno about the scr switches, maybe -fet controlled?

edit: hey! you're a blu-ray!
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Old 02-17-2011, 03:48 PM #169
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Default Re: Halo Style 2 stage COILGUN

Yay ^^ blu ray...I feel like dancing xD

Regarding the SCRs.....ok for switching...I meant the V-switch consisting of 2 SCR which cuts off the ongoing pulse-progress, when the projectile is right in the middle of the coil!
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Old 02-17-2011, 03:58 PM #170
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Default Re: Halo Style 2 stage COILGUN

hahahah.. soon you will be a bluey, getting more expensive everyday uh?
I'm no expert.. I'll adjust the pulse capability using the coil, I'll not use a 'limiter' or something similar to deactivate the pulse when I want it. I'll adjust the capacitance for that then.

offtopic:
about your laser gun. How you get the ssy-1? I really liked it..
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Old 02-17-2011, 04:04 PM #171
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Default Re: Halo Style 2 stage COILGUN

You can use any laser-head for this. Doesnt have to be a SSYhead.
Dont tell anyone: Its not pulled from an American tank. I even have the original base-plate with all optics and trigger-board.

Regarding coilguns: Thats the right way! The more coils you get, the faster pulses you need...
My rifle will have 9 stages....1000J in total...cant wait to test it. Before that, I will make a 3 stage coilgun with 320J in total.
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Old 02-17-2011, 04:09 PM #172
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Default Re: Halo Style 2 stage COILGUN

Oh well. I wanted to build myself such a thing but don't know where to start my research. Maybe if I get a tank (with free shipping) I could extract the head with my 20W soldering iron, right?

CG: *waiting eager for your rifle *
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Old 02-17-2011, 04:14 PM #173
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Default Re: Halo Style 2 stage COILGUN

Just keep your eyes open and check ebay.
If nothing helps, I have several heads laying around ...."laying around"!
Wont be cheap, but I would sell you one. Mail me for details.

Guess it will be done middle of the year. Will be hard to make such a !weapon!...maybe it will even pierce the door of a car. xD
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Old 02-17-2011, 04:31 PM #174
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Default Re: Halo Style 2 stage COILGUN

ok..
Whats the predicted efficiency of your 1000J 9S rifle?
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Old 02-17-2011, 04:34 PM #175
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Default Re: Halo Style 2 stage COILGUN

No idea!
Biggest project ever. Will be hard to achieve anyway. All the wires will have the mass of the entire frame xD
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Old 02-17-2011, 04:35 PM #176
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Default Re: Halo Style 2 stage COILGUN

I'd like to meet someday with some coilgunners, and together make something like that.
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