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Single pump pneumatic pistol prototype, dodgy mark 1

Built a pneumatic cannon? Then post it here! This section is for completed, finished cannons that you have built. Please include pictures and information.
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Single pump pneumatic pistol prototype, dodgy mark 1

Unread postAuthor: Teflon » Sun Jun 02, 2013 9:33 am

Hello once more spudders.

I recently purchased a minilathe.
Oh the fun I've been having with it.

One side project I have been working on is a single pump pistol.

I've got the design all worked out, and I've been quickly throwing together a prototype, as you can see below, its far from finished.

So far I've got the piston, hammer valve, hammer, and trigger mechanism all made, I've worked out the final dimensions for all these components, however as I've been working with scrap so far, its not exactly neat, but whatever it works.
I have achieved my goal of working out any bugs in the basic workings.

It will be shooting 6mm BB's.
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Attachments
SAM_0331_Edited.JPG
Ahh, chopping board and rubber bands
SAM_0332.JPG
The trigger mechanism locks onto a groove in the rod when the rod is pulled back
SAM_0337.JPG
Just need a lever, and a barrel now...

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Unread postAuthor: Brian the brain » Tue Jun 04, 2013 11:22 am

Very interesting!

How about a diagram of the internals?

I can't figure out where the hammervalve is located.
It looks to be a springpiston type launcher...
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Gun Freak wrote:
Oh my friggin god stop being so awesome, that thing is pure kick ass. Most innovative and creative pneumatic that the files have ever come by!

Can't ask for a better compliment!!
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Unread postAuthor: jackssmirkingrevenge » Tue Jun 04, 2013 3:50 pm

I had missed this, interesting!

I second Brian's request for a diagram :)
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Unread postAuthor: Teflon » Tue Jun 04, 2013 7:55 pm

Im at work at the moment so a quick paint diagram should hopefully do the trick.

The back of the valve is polished to 5.92mm and the hole is drilled and polished out to what i hope is 6.00mm with the valve pushed forward and my finger on the barrel port hole, i cant blow air through, but the valve does move freely.

i plan to put a lever under the piston, with the axis below the line of force when pumped, so that the force of the piston pushing out will hold the lever up, i have done this with another gun and it worked very well.
of course once ive shot the lever will simply fall.. so ill need some sort of friction or mechanism to hold it up anyway.

the gun will be bolt loading.

as it is at the moment it makes a rather nice crack when you hold pressure on the piston by hand and fire it.
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Attachments
hammer valve.JPG
you might have to zoom in to see this one...
hammer valve.JPG (4.16 KiB) Viewed 724 times

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Unread postAuthor: jackssmirkingrevenge » Wed Jun 05, 2013 12:26 am

Nice! It's not going to be a powerhouse by any measure but I like the fact that it's self contained, good show!
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