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35 bar repeater ( new pics on page 4)

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: Brian the brain » Thu May 08, 2008 3:59 pm

I will not knock open the hammer.There would be no point. :D

I need the hammer to knock open the valve.
I will use a similar trigger system I used in the rubber bandgun I posted a few months ago. ( shotgun replica thread)
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Unread postAuthor: MaxuS the 2nd » Thu May 08, 2008 4:03 pm

:lol: Of course. Can't wait to see this thing in action, BTB.
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Unread postAuthor: psycix » Thu May 08, 2008 5:23 pm

Well BTB, youve created something worth the attention again :D
Really awesome.
We want to see it in action!



For the air vs water hijack:

Ragnarok wrote:Air and water at 500 psi will put exactly the same strain on the valve.
Yes, different things will happen if it should fail, but 500 psi is 500 psi - guys.


Indeed! 500 psi is 500 psi, and it doesnt matter if its water or air.
Just take things literally:
psi -> pounds per square inch
It doesnt matter what it is, but 500 pounds of force on a square inch area is indifferent to what gas or liquid you use.
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Unread postAuthor: Brian the brain » Sat May 10, 2008 1:23 pm

Just tried a new spring between the pin and the phram, so I don;t need an external spring for the pin.This means it is now again compacter.

I got about 20 good firings out of a 500 gr paintballtank, filled to "only"25 bar of air.And a lot of puffs..

Not that they were all powerfull enough for my taste, but still.

The restricted flow from the reservoir (PB tank) probably upped the number of shots, but gave them less force.

I'll need to get fittings and build my own reservoir, preferably 1.25"

Pretty sure I can get it to form an ergonomic "sawed-off" style lever action gun, at least capable of 5-6 very powerful shots.
Think "terminator II"
Previous work on falling block reloader:
http://www.spudfiles.com/forums/how-to- ... t3906.html

I have decided to dub this new project B2TB . Why?
It's a new generation of sawed off by BTB and it's short for
"Bad to the Bone"
wich is also a song from the Terminator II movie.
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Unread postAuthor: MrCrowley » Sat May 10, 2008 3:51 pm

@BtB,
Oh yeah I remember the falling block, did that ever get properly tested?
What are you going to end up making it out of?


Off-topic:
psycix wrote:
Ragnarok wrote:Air and water at 500 psi will put exactly the same strain on the valve.
Yes, different things will happen if it should fail, but 500 psi is 500 psi - guys.


Indeed! 500 psi is 500 psi, and it doesnt matter if its water or air.
Just take things literally:
psi -> pounds per square inch
It doesnt matter what it is, but 500 pounds of force on a square inch area is indifferent to what gas or liquid you use.

I'm not sure if you guys know, but that's exactly what I said in my first post to that guy. It looks like this was aimed at both me and the other guy, where I had said the same thing as what Rag just summed up.

Just a bit confused.
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Unread postAuthor: Lentamentalisk » Sat May 10, 2008 4:01 pm

does anyone have diagram or anything of a hammer valve? How from what I have read they seem very tricky to machine, but you guys seem to be making them fairly easily, so I was wondering what your trick is. I have searched the forums to no avail, though I remember seeing some hammer valves somewhere on here.
I absolutely love the falling block idea!
Keep up the good work!
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Unread postAuthor: Brian the brain » Sun May 11, 2008 2:25 am

1/2" to 1/4"reducer ( metal ofcourse).
Take a bolt with a head the size it WON'T go through with a head shaped like : \/
All you need now is a rubber washer for the seal and a spring and nut to keep the bolt in place.


There are many ways to do this
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Unread postAuthor: microman171 » Sun May 11, 2008 2:38 am

Can you be sligtly more specific? Like a diagram or somthing? I have been wondering about these for a while (and a google didnt turn up anything) What does a hammer valve do?
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Unread postAuthor: Brian the brain » Sun May 11, 2008 2:45 am

It's basically an object blocking a hole, wich can be opened by pushing or knocking that object away from the hole.

Maybe you are familair with car tire valves?
That is the same in principle.If the stem was sticking out a little more it could be hammered. ( it still can, just not as easy)
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Last edited by Brian the brain on Mon May 12, 2008 4:31 am, edited 1 time in total.
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Unread postAuthor: microman171 » Mon May 12, 2008 1:37 am

Ohhhhh That is a really good idea for say a coper. I could use it and the main valve? Like a finger trigger? Or is it called a hammer valve for a reason...?
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Unread postAuthor: Hawkeye » Mon May 12, 2008 7:00 am

Yes because it is knocked open with a spring loaded "hammer".
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Unread postAuthor: microman171 » Mon May 12, 2008 2:04 pm

hmmmmmm. So I could use a sear to hold onto the hammer... Thanks for all the help guys!
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Unread postAuthor: Brian the brain » Tue May 13, 2008 3:28 pm

Succes!!
I made a crude body and a hammer out of plywood, weighted by a thick brass fitting at the top.
It looks like hell, but it works!!

A spring smacks the hamer into the hammer valve.The trick is , when the hammer is in rest position, it doesn't push the valve.It only knocks open the valve by ongoing momentum.
The spring is just too short to push the hammer onto the valve.

Now to make it look good.Both the hammer-valve set up functions and I've already once made a falling block reloader.

So now I need to combine those wto in a good way.
I'm thinking hard wood stock/body and metal moving parts.
I've got work to do.
Also I need a bigger chamber for more shots!! :D
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Unread postAuthor: psycix » Tue May 13, 2008 5:47 pm

Any pics of the building process? :D
Sounds like your making good progress, keep it up!
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Unread postAuthor: microman171 » Wed May 14, 2008 2:44 am

Yeah! Can we please have some pictures?
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