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Registered Member #1062
Joined: Tue Oct 16 2007, 02:01AM
Location:
Posts: 1529
I've been working on a coil gun. I am working on them for a science fair project in determining the best way to affect effeciency. I hope to get 5kJ worth of Capacitors, but im still working on getting them. Ile update as i get items/construct.
Parts i have:
3x ST180S12POV (SCR's) - Datasheet: 4x Fast recovery diodes: R6021225HSYA - 5x 300 watt, 1000ohm bleeder resistors 1' x .5" Hymu-80 rod - will become proectiles
Parts i need:
Capacitors - 6x 400v 2900uf -- Shipping --
Plans/Pics:
The SCR's and Diodes, with AA for comparison:
Bleeder resistors fairly big, larger than expected
Heres some renderings done on Rhino of the railgun and coilgun. Capacitor bank is shown on railgun, and railgun is ghost rendered. Each little sqare is 1/4in, and each big square (marked by darker lines) is 1in.
Coilgun:
Specs: 14 in long, 3 coils. AWG wire - 12 624J each stage
I have decided on using a quad comparator and phototransistors to trigger.
Update
After a long delay, started project again. I ditched the railgun, and im using 624J X 3 for a multistage coilgun. Heres the coil gun:
Capacitors are shipping. My charging will be a voltage multiplier for 110 to ~600v. Capacitors will be in sets of 2 for each stage.
Update 2
Ive mounted everything on a base and wired the anti-parrallel diodes and SCR's together. Now i am just lacking the capacitors and triggering system. I have started making a triggering system using a LM339 Quad-Comparator. If you look at earlier pic, you can see the that the IR Emitter/Reciever are built in. Ive got the basic LM339 working, but i gotta make it work with a 2SB772 NPN transistor for it to switch the SCR's.
Heres a pic:
The empty space will be where the Capacitors will go. The (+) of the cap bank will connect to the studs of the SCR's and the (-)'s will connect to the Diode (screwed down part). In the upper right is my LM339 triggering system prototype. The Aluminum thing right after the CG is a simple set of IR Emitter/Recievers i will use with my PC to chrono the projectile. Ferroxcube, chtechnology, and Powerohm logos are on there to show who donated parts.
Registered Member #1062
Joined: Tue Oct 16 2007, 02:01AM
Location:
Posts: 1529
a 1/3rd horsepower Drill O.o
Doing it at school,so table saw, radial arm saw, drill press, band saw, metal bandsaw, horizontal bandsaw, drum sander, belt/disc sander, scroll saw, spot welder, mig welder, arc welder, and a foundry O.o.
Registered Member #1083
Joined: Mon Oct 29 2007, 06:16PM
Location: Upland, California
Posts: 256
If I recall, it's best if you have a resistor of about 1k on the gate of the fire scr, if you're running straight from a 9v battery. P.S. What program did you use for the schematic?
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coil gun
