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My first piston

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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My first piston

Unread postAuthor: wannabie » Mon Jul 09, 2007 1:29 am

This is my new co-axle piston gun i made mainly from Polly pipe but some peices are brass. one day on these long and boring hollidays i found i had a 1"-1/2" fiting that was threaded all the way through so i could screw on my barrel backwards and i thought OMFG i can make a piston so it took me about 3 days till i had it finished and fully operational.Although it can only shoot through 10mm plaster board :( i dont know why....

here it is :D

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i hope you like it :D :D :D
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Unread postAuthor: MrCrowley » Mon Jul 09, 2007 1:38 am

Try increasing your pilot valve for more performance. Looks like a nice gun.
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Unread postAuthor: Infernal Maveric » Mon Jul 09, 2007 2:00 am

Looks like a nice coax you got there. The grip seems really uncomfortable to hold but still looks good.

McCrowley, INcreasing the pilot makes for slower air exhaustion, thus slower opening times/worse performance.

Decrease your pilot and it will open faster.

What pressure are you shooting with?
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Unread postAuthor: wannabie » Mon Jul 09, 2007 2:04 am

im shooting at 100psi. and the handle is acatually comfortable because you hold it just like a pistol grip.


@ Mr.crowley what do you sugest for the pilot?
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Unread postAuthor: Insomniac » Mon Jul 09, 2007 2:07 am

Infernal, he means increasing the pilot valve, not the pilot volume. A bigger valve will vent faster and improve performance. That looks like a fun little gun you have there.
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Unread postAuthor: Pete Zaria » Mon Jul 09, 2007 2:08 am

MrCrowley meant increase the size of the pilot valve to vent the pilot volume faster, not increase the amount of pilot volume.

@wannabie,
The higher-flow your pilot valve, the faster it will open your main valve, and the more power you'll get.
QEV's, pistons, and modified sprinklers are the "best" pilot valves, but are probably overkill for a gun this small.

Personally, I'd fully mod a blowgun (read around here...) or just use a ball valve (like a 1/2").

Peace,
Pete Zaria.
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Unread postAuthor: Infernal Maveric » Mon Jul 09, 2007 2:10 am

Oh ok thanks, guess I just read it wrong.

Yeah, adding a bigger pilot valve would help performance a lot. A bigger ball valve or a modded blow gun would work well.

Can you, or have you taken the gun to 150PSI? At that pressure the gun would be way more powerful.
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Unread postAuthor: wannabie » Mon Jul 09, 2007 2:27 am

thanks guys i might try it woth a 1/2" ball valve and i could take it to 150 psi but i cbf pumping it that high :lol:
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Unread postAuthor: MrCrowley » Mon Jul 09, 2007 3:15 am

I would say a 1/2" ball valve would be your best bet/
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Unread postAuthor: spud yeti » Mon Jul 09, 2007 9:25 am

Looks good, well done. I'd also say a 1/2" ball valve would work well.
Are you using a bike pump to fill it?
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really good quote/phrase here
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Unread postAuthor: Mitchza89 » Thu Jul 12, 2007 10:57 pm

Thats a really nice gun. With a decent pilot vent valve, it'll be an absolute animal.
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Unread postAuthor: wannabie » Fri Jul 13, 2007 1:51 am

@ spud yeti yes im using a bike pump to fill it.

and i have added a 1/2" ball valve but it hasnt seemed to make any diffeerence any idea's why?
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Unread postAuthor: rna_duelers » Fri Jul 13, 2007 3:12 am

Nice set up,poly all the way,it's good stuff with it's 16 bar running pressure plus it's cheap!

Whats the piston made of?Hotglue moulded?
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Unread postAuthor: wannabie » Fri Jul 13, 2007 3:15 am

The piston is a bit of curtain rod that happend to fit very nicly in the pipe and the sealing face is some kind of foamy stuff that seals good.
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Last edited by wannabie on Fri Jul 13, 2007 3:27 am, edited 1 time in total.
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Unread postAuthor: spud yeti » Fri Jul 13, 2007 3:20 am

thats a very...er...creative sounding piston! LOL, mine are all like that too, whatever fits well works hey! (and it usually doesnt cost :D )
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really good quote/phrase here
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