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prototype ballistic knife

Post questions and info about pneumatic (compressed gas) powered cannons here. This includes discussion about valves, pipe types, compressors, alternate gas setups, and anything else relevant.
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Unread postAuthor: Crna Legija » Thu Apr 28, 2011 3:10 pm

i started to make one like the pic jsr posted, but im going to use a leaver to hold it back. more like the real thing. should have pics later today.
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Unread postAuthor: Crna Legija » Fri Apr 29, 2011 12:17 pm

its been awhile hope you dont mine the double post but i have new pics, still need to make the leaver/trigger but it should be done later today.
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Attachments
seal.jpg
this it the pipe that connects to the knive.
blade+rod.jpg
the pipe and blade side, i got some really crap epoxy took like 3hr to get hard enough to touch without recking it.
blade+rod.jpg (23.24 KiB) Viewed 566 times
fillvalvehandle.jpg
the fill valve.
fronthandle.jpg
the front of the handle part.
all.jpg
thats the hole thing its 25 cm long like that. the blade part weighs a hefty 89 grams
all.jpg (21.25 KiB) Viewed 566 times
'' To alcohol... The cause of, and solution to, all of life's problems.”
--Homer Simpson

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Unread postAuthor: warhead052 » Fri Apr 29, 2011 1:11 pm

So pretty much the QD propels the knife forward, and the little discharge of air boosts it? Am I correct on that? If so, I think I know what I am gonna be spending $10 on!
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Unread postAuthor: jakethebeast » Fri Apr 29, 2011 3:02 pm

Crna, if youd like i could make a REAL blade :D pm if you want
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Unread postAuthor: mark.f » Fri Apr 29, 2011 3:06 pm

Actually, wouldn't a "real" blade be pretty brittle for this application?

EDIT: PS, Crna Legija, how do you cut your o-ring grooves? I've been using a miter saw followed by needle files to cut mine, but it's a little hit and miss.
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Unread postAuthor: jakethebeast » Fri Apr 29, 2011 3:07 pm

nope, if its hardened right it would flex, so it would giv you greater impact without breiking.

EDIT: when i get some gas to my gasforge i can do few blades from 5160 springsteel and show you what i mean
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Unread postAuthor: Crna Legija » Fri Apr 29, 2011 7:42 pm

jakethebeast wrote:Crna, if youd like i could make a REAL blade :D pm if you want



thanks, but if it works out to be powerful enough ill make one theres lots of how to on the net.

mark.f wrote:Actually, wouldn't a "real" blade be pretty brittle for this application?

EDIT: PS, Crna Legija, how do you cut your o-ring grooves? I've been using a miter saw followed by needle files to cut mine, but it's a little hit and miss.



warhead052 wrote:So pretty much the QD propels the knife forward, and the little discharge of air boosts it? Am I correct on that? If so, I think I know what I am gonna be spending $10 on!


yep that it

i put a peace of all thread in the pipe and tighten two nuts on ether side. then put in the drill press and used a round fill to make the cut.
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Unread postAuthor: jackssmirkingrevenge » Fri Apr 29, 2011 8:05 pm

Looking good! Curious to see your lever design.

i got some really crap epoxy took like 3hr to get hard enough to touch without wrecking it.


This is fairly normal, in general the longer epoxy takes to cure, the stronger the result. I usually allow 24 hours for my marine epoxy to cure, depending on ambient temperature.

jakethebeast wrote:Crna, if youd like i could make a REAL blade :D pm if you want


I'm liking this level of cooperation on the forums of late :)
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Unread postAuthor: Crna Legija » Fri Apr 29, 2011 10:09 pm

the leaver is simple
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Attachments
FittingQuickDisconnect2.jpg
just like this one.
FittingQuickDisconnect2.jpg (11.75 KiB) Viewed 481 times
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Unread postAuthor: warhead052 » Fri Apr 29, 2011 11:28 pm

Ok, I may be making my own when I finish off a screw in schrader project... (I am making a few, just to be on the safe side...) I will build a little chamber and stuff for this project though! This is going to be a very fun project.
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Unread postAuthor: jakethebeast » Sat Apr 30, 2011 2:39 am

crna, trust me. From internet tutorial, its very hard to make a blade that would survive this kind of beating. but its your knife, not mine :)
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Unread postAuthor: Crna Legija » Sat Apr 30, 2011 7:08 am

hey if you wanna do it for free, im in :D didn't get any work done today wasn't home.
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Unread postAuthor: warhead052 » Sat Apr 30, 2011 8:58 am

Ok, my epoxy is almost done curing, I left it over night and for some reason its not done.... :| But I will definatly start and fire it off when I can!
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Unread postAuthor: Crna Legija » Sat Apr 30, 2011 9:37 am

nice, get some pics.
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Unread postAuthor: warhead052 » Sat Apr 30, 2011 9:44 am

I will try! It is still curing, I am putting it through some heat to mold it a little bit better to make sure of no leaks, but yeah.
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