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Pneumatic Pressures: The Safe, The Possible, And The Crazy

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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Re: Pneumatic Pressures: The Safe, The Possible, And The Cra

Unread postAuthor: wyz2285 » Tue Dec 01, 2015 4:40 pm

I suppose the dimensions are in millimeters and pressure in psi?
Well I only have 400mm of tube and currently time is restricted. Might do it if not too busy during Christmas. Shot count isn't important, I can have a 2000 psi output tank with me to refill. Finally taking a gun license next February and I'd like to have a PCP rifle to use instead of a springer.
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CpTn_lAw wrote::D "yay, me wanna make big multishot pnoob with 1000 psi foot pump compressor using diamond as main material. Do you think wet bread make good sealant? " :D
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Re: Pneumatic Pressures: The Safe, The Possible, And The Cra

Unread postAuthor: Gippeto » Tue Dec 01, 2015 5:33 pm

Dimensions are in inches. Pressure and hoop stress are in psi.

What happened to the pcp rifles you built?
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Re: Pneumatic Pressures: The Safe, The Possible, And The Cra

Unread postAuthor: wyz2285 » Tue Dec 01, 2015 6:02 pm

The valve jammed and since the chamber was epoxied it's beyond repair.
From the quality of the 2240, I suppose the stock barrel wouldn't be very good. Still, not very willing to install decent one and design a completely new receiver... Gonna spend the co2 cartridges that came in with it and see what it can do.
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CpTn_lAw wrote::D "yay, me wanna make big multishot pnoob with 1000 psi foot pump compressor using diamond as main material. Do you think wet bread make good sealant? " :D
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Re: Pneumatic Pressures: The Safe, The Possible, And The Cra

Unread postAuthor: Gippeto » Tue Dec 01, 2015 7:04 pm

That's unfortunate.

2240 is...inexpensive. Stock barrels are hit and miss...some are horrid...some are VERY good. Most benefit from having the forcing cone/chamber/transfer port/ leade area de-burred and polished and a re-crown. Some bores can use a bit of lapping too.

Trigger will benefit from a lighter sear spring, shim the side play out of the guts, stone and lube the contact points. Lots of info available with a quick google search.
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Re: Pneumatic Pressures: The Safe, The Possible, And The Cra

Unread postAuthor: wyz2285 » Tue Dec 01, 2015 7:21 pm

Yeah I started searching about the trigger as it was a bit heavy for my likings.
Dunno if I dare to change the barrel... Maybe I'll drill the transfer port into the receiver and cut off the rear of the barrel.
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CpTn_lAw wrote::D "yay, me wanna make big multishot pnoob with 1000 psi foot pump compressor using diamond as main material. Do you think wet bread make good sealant? " :D
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Re: Pneumatic Pressures: The Safe, The Possible, And The Cra

Unread postAuthor: jackssmirkingrevenge » Wed Dec 02, 2015 2:35 pm

Here's the mod I had done for my 1322, weak spring and brass spring guide:

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Re: Pneumatic Pressures: The Safe, The Possible, And The Cra

Unread postAuthor: wyz2285 » Wed Dec 02, 2015 3:28 pm

Yep thats what I have in mind, a spring guide seems like a standard mod.
How did you mill the curve of the receiver bottom?
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CpTn_lAw wrote::D "yay, me wanna make big multishot pnoob with 1000 psi foot pump compressor using diamond as main material. Do you think wet bread make good sealant? " :D
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Re: Pneumatic Pressures: The Safe, The Possible, And The Cra

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Re: Pneumatic Pressures: The Safe, The Possible, And The Cra

Unread postAuthor: jackssmirkingrevenge » Wed Dec 02, 2015 3:33 pm

Shallow pass with a 3/8" ball mill.
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