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Jackhammers...

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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Jackhammers...

Unread postAuthor: FishBoy » Fri Oct 10, 2008 9:04 am

I was wondering how the pneumatics of a Jackhammer work, anybody know? I was thinking it would be cool to make a mini one, even if it didn't quite work.
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Re: Jackhammers...

Unread postAuthor: Ragnarok » Fri Oct 10, 2008 9:22 am

FishBoy wrote:I was wondering how the pneumatics of a Jackhammer work, anybody know?

Unfortunately, I used to have a book that explained it with nice diagrams, but I got rid of it only a couple of weeks ago.

Hmm, the internet seems to be rather lacking in anything about them. I would have expected how stuff works to have an explanation...

What I can remember is that they're not particularly simple, and wouldn't be an easy project.
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Unread postAuthor: FishBoy » Fri Oct 10, 2008 9:28 am

ok, this is mainly out of curiosity
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Unread postAuthor: Ragnarok » Fri Oct 10, 2008 9:42 am

FishBoy wrote:ok, this is mainly out of curiosity

Well, IIRC, they're basically a pneumatically driven hammer/weight that strikes the back of the drill bit, a bit like you might use a hammer and chisel.
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Unread postAuthor: Biopyro » Fri Oct 10, 2008 9:57 am

I'd assume its a QEV which vents into the cylinder where the drill bit is, pushing the bit down. then a second QEV vents under the bit to push it up again. (air is released after each stage and the QEV's run on pressure switches)
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Unread postAuthor: jackssmirkingrevenge » Fri Oct 10, 2008 10:55 am

Sounds like it would make one hell of a full auto pneumatic breech :)
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Unread postAuthor: Ragnarok » Fri Oct 10, 2008 11:13 am

jackssmirkingrevenge wrote:Sounds like it would make one hell of a full auto pneumatic breech :)

Actually, I've developed something around a similar concept - it can reload as fast as the chamber can reset for the next shot.
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Unread postAuthor: Pilgrimman » Fri Oct 10, 2008 12:59 pm

http://www.explainthatstuff.com/jackhammer.html

This kind of helps. There is a .gif animation.
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Unread postAuthor: jackssmirkingrevenge » Fri Oct 10, 2008 1:06 pm

Interesting, for some reason reminds me of this design...
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Unread postAuthor: Pilgrimman » Fri Oct 10, 2008 1:13 pm

Ha ha yeah :D I tried to link to it directly, but it wouldn't work, so I said "Screw it" and linked to the page instead :lol:
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Unread postAuthor: jackssmirkingrevenge » Fri Oct 10, 2008 1:14 pm

Didn't even try to link it, I figured they'd be protective of their precious animation so uploaded it here directly :)
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Unread postAuthor: CS » Fri Oct 10, 2008 1:27 pm

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