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piston valve mkII

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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piston valve mkII

Unread postAuthor: urgle the danish cow » Wed Jul 21, 2010 12:15 pm

this is a revised version of my first piston valve by adding a blowgun and reducing pilot vloume(still needs work). the chamber is 3/4in copper pipe and the barrel is completely threaded but was surprisingly cheap being 1/4in bore and is 3 feet long. i found it in the lamp section of my hardware store as a wire housing for lamps. i havent got a chance to take any damage pics as i finished the enlarged chamber and barrel today. i have a smaller barrel and airchamber from an old gun with a pressure washer barrel for the barrel.
the piston is made of hot glue and has a rubber sealing face.
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Attachments
IMG_0263.JPG
the gun with the long barrel and chamber
IMG_0257.JPG
with the old short barrel
IMG_0262.JPG
looking down the gun
IMG_0258.JPG
veiw from the back with the short barrel on
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urgle the danish cow
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Unread postAuthor: clemsonguy1125 » Wed Jul 21, 2010 12:19 pm

Looks good, but that pilot volume is HUGE, if you reduce it you will see a noticable power increase.
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That is all.
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Unread postAuthor: urgle the danish cow » Wed Jul 21, 2010 12:25 pm

clemsonguy1125 wrote:Looks good, but that pilot volume is HUGE, if you reduce it you will see a noticable power increase.

:D you should have seen it before. it was gigantic! and yeah im workin on it. as you may have known from my 1/2 coax project about a week ago im not very good at pistons
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Unread postAuthor: Clarke » Wed Jul 21, 2010 6:41 pm

You should switch the blowgun with the schrader so it has a more gun type feel and it will probably increase you accuracy.
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Unread postAuthor: urgle the danish cow » Wed Jul 21, 2010 9:22 pm

Clarke wrote:You should switch the blowgun with the schrader so it has a more gun type feel and it will probably increase you accuracy.

i was going to have a 90 degree elbow for the blow gun for that but that is a good idea, i will do that. cheers
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Unread postAuthor: ilovefire » Thu Jul 22, 2010 2:12 am

cool looks good! its almost the same a what i was thinking of trying to make
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Unread postAuthor: Clarke » Thu Jul 22, 2010 6:52 am

As clemsonguy1125 said i think you need to re do the pilot side and you will see a noticable increase in power, combined with the new blowgun position and this think would be a great clean looking gun.
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Unread postAuthor: Clarke » Thu Jul 22, 2010 6:59 am

As clemsonguy1125 said i think if your re-did your pilot side and re-positioned the blowgun i think you will notice far better power and accuracy.

Edit; Sorry double post
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