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Forums
4hv.org :: Forums :: Projects
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Ring Launcher

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Part Scavenger
Sun Sept 10 2006, 02:20AM Print
Part Scavenger Registered Member #79 Joined: Thu Feb 09 2006, 11:35AM
Location: Arkansas
Posts: 673
A fun project for the weekend, I started quite some time back and never got around to finishing it. I finished her this afternoon. The aluminum ring is from a hard drive, the post from a printer, the brass rings on the voltmeter are actually shotshells. The wood is white oak from a tree that was in our backyard. It silently launches the ring about three feet in the air. Came out looking rather sharp I think. There is a guy at an alternator shop who is saving wire for me, I built this (in part) so I could show him something I did with his wire.

Enjoy.
1157854855 79 FT0 100 4578

1157854855 79 FT0 100 4580
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ragnar
Sun Sept 10 2006, 03:54AM
ragnar Registered Member #63 Joined: Thu Feb 09 2006, 06:18AM
Location:
Posts: 1425
Wow... that's really, really nice. I recognised the shotgun shells around the LEDs, they are SO charming!!

Beautiful work on the box-edges, too!
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Alex
Sun Sept 10 2006, 04:46AM
Alex Geometrically Frustrated
Registered Member #6 Joined: Thu Feb 02 2006, 04:18AM
Location: Bowdoin, Maine
Posts: 373
Very nice! A good example of what attention to aesthetics and detail can do to an otherwise average project. Well done.
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Avalanche
Sun Sept 10 2006, 10:51AM
Avalanche Registered Member #103 Joined: Thu Feb 09 2006, 08:16PM
Location: Derby, UK
Posts: 845
Nice, I like the woodwork there!

Those shotgun shells add a nice touch, I might have to 'borrow' that idea for things like headphone sockets and switches as well tongue
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Marko
Sun Sept 10 2006, 01:29PM
Marko Registered Member #89 Joined: Thu Feb 09 2006, 02:40PM
Location: Zadar, Croatia
Posts: 3145
Very nice box!

A TC built in similar one with those shell leds may be be even more gorgeous smile

PS. just saw avalanche's coil looking somewhat like such..
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Part Scavenger
Sun Sept 10 2006, 04:59PM
Part Scavenger Registered Member #79 Joined: Thu Feb 09 2006, 11:35AM
Location: Arkansas
Posts: 673
Thanks! It's a big hit with my sisters too, they've been playing with it all morning. I guess I should give some credit to my dad. He cut and glued the box together, but he's never interested in finishing them for some reason. That's always my job.
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Avalanche
Sun Sept 10 2006, 05:38PM
Avalanche Registered Member #103 Joined: Thu Feb 09 2006, 08:16PM
Location: Derby, UK
Posts: 845
hehe yes I posted my SGTC not long after seeing this, because it looked so similar. You win with the case though, it has a much nicer construction and finish than the one I built...

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Marko
Sun Sept 10 2006, 05:46PM
Marko Registered Member #89 Joined: Thu Feb 09 2006, 02:40PM
Location: Zadar, Croatia
Posts: 3145
Doh, I should have competed with my ATX DRSSTC electronics-shielding for the ugliest box ill

For curiosity, you didn't describe is it just a thompson launcher or you have caps in it, or both cheesey

(wondering because of all that leds in front)
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Part Scavenger
Sun Sept 10 2006, 11:31PM
Part Scavenger Registered Member #79 Joined: Thu Feb 09 2006, 11:35AM
Location: Arkansas
Posts: 673
Well, I don't really know any difference between any launchers. I didn't really do any research at all on the topic. I just remembered seeing one in the science museum, and spent about 30 min figuring out how it worked. Basically, I have a voltage doubler feeding a 400V, 470uF 'lytic. I then dug out an SCR, found out what it's pulse rating was, and designed the inductor accordingly. Actually, I could have gotten by with far better performance, but I didn't really want it to shoot 6' in the air, so I added some more inductance. A smarter way would have been to get a smaller cap I guess, but at that point the inductor was the easiest thing to change. BTW, there is a huge decrease in performance between a mechanical switch and the SCR.

The voltmeter is basically a divider that reads the voltage across the cap and feeds into an LM324 which, in turn, lights the leds.

If I can ever get around to it, I was planning to put the schematic, PCB's and some gut pics on my site, but unless there's demand I probably won't do it any time soon.

EDIT: Here's the PCB's though.
Link2
Link2
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Marko
Mon Sept 11 2006, 10:56AM
Marko Registered Member #89 Joined: Thu Feb 09 2006, 02:40PM
Location: Zadar, Croatia
Posts: 3145

Is taht pole of metal or it's a wierd looking non-conducting stuff?

For plse launchers metal shaft would waste lot of energy unneedingly..
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