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Bolt Action Musket

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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Bolt Action Musket

Unread postAuthor: Lockednloaded » Mon May 17, 2010 4:40 pm

This is really more of a side build for me, but I think it looks nice nonetheless. It is a spare parts gun with the valve reconfigured from my old semi-auto shotgun. Here's some specs:
SPECIFICATIONS:
CHAMBER-1" pvc
VALVE- super modified sprinkler valve (new diaphragm)
BARREL- about a foot of 3/4" pvc
PILOT VALVE- 1/4" 125psi pop-off.

Now its picture time!

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Unread postAuthor: deathbyDWV » Mon May 17, 2010 5:07 pm

That looks kinda like my first pneumatic gun... I like how you set up the pop off as the trigger... I've always kinda wanted to do that with a longer string for my big cannon so i can fire it artillery style... :P
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Unread postAuthor: Gun Freak » Mon May 17, 2010 5:15 pm

Is the breech housed in 1.25" pvc?
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Unread postAuthor: Lockednloaded » Mon May 17, 2010 5:41 pm

The great thing about the pop off pilot is that it works well for a poor man's semi, and has full 1/4" flow.
Yes the breech is housed inside 1 1/4", i recommend it for 3/4" breech loaders, great fit

P.s.
would anyone like a picture of the new diaphragm, i just opened it up, so now or never
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Unread postAuthor: Gun Freak » Mon May 17, 2010 5:50 pm

yeah
afkldsfhakldfhakld
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Unread postAuthor: Lockednloaded » Mon May 17, 2010 5:54 pm

Gun Freak, if you hold down space it makes the message long enough :idea:

Here it is, it greatly increases flow, no spring and less dead weight
The spring is just for comparison

sealing face:
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Back support washer
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Unread postAuthor: Gun Freak » Mon May 17, 2010 7:03 pm

So does the pressure of the screws tightening hole the diaphragm in place enough to seal the air pressure too? Or do you use an o-ring around the groove of the sprinkler?
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Unread postAuthor: Lockednloaded » Mon May 17, 2010 7:19 pm

the diaphragm is free standing inside the valve. For sealing the cap i just cut the o'ring off the original diaphragm.
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Unread postAuthor: Gun Freak » Mon May 17, 2010 7:22 pm

How does it seal if it is free standing? I'm confused :?
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Unread postAuthor: Lockednloaded » Mon May 17, 2010 7:48 pm

the diaphragm is filled from the back, the air pressure pushes it against the pipe inside the valve. or are you asking about the cap?
maybe free-standing is the wrong word...
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Unread postAuthor: Gun Freak » Mon May 17, 2010 7:49 pm

Oh ok so it isn't touching the seat until filled.
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Unread postAuthor: Lockednloaded » Mon May 17, 2010 8:00 pm

yea, pretty much like a piston
It yields much more power than your average sprinkler, and can take up to 200 psi, but I won't be doing that any time soon, my bike pump died and i can't get a new one until school ends.
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Unread postAuthor: Gun Freak » Mon May 17, 2010 8:04 pm

well the gun is pvc anyway, 200 psi wouldnt be safe.
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Unread postAuthor: Lockednloaded » Mon May 17, 2010 8:08 pm

pvc should be safe to 200 psi, most people dont trust it to anywhere near its rated pressure because of its "failure mode" I trust my solvent weld, but i cannot take it past 125 because of my trigger :(
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Unread postAuthor: Gun Freak » Mon May 17, 2010 8:09 pm

well put a blowgun on there and you're set
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