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Spare parts piston valve

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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Spare parts piston valve

Unread postAuthor: urgle the danish cow » Wed Mar 31, 2010 6:24 pm

this is my first post and good piston valve so constructive critizism is welcome.
This is made of spare parts after a project with a friend and to be honest i got this idea while doin Geometry homework :roll:
the barrel is made from a pressure washer and i filed out the hex at the end.
it has a relativly small air chamber but it works great.
the piston is cast of hot glue and the sealing face of rubber.
it uses vehicle gear lubricant as lube
it shoots rather fast so airsoft bbs only go about 25m before going wherever they please. i find most sucess in lead .22 bullets
i did have a plan to put a red dot on it but with its limited range with cheap ammo i decided against it.
it shoots very strong im not sure how strong but according to damage it seems to shoot stronger then my airsoft dragunov which shoots 520 fps with .20s.
using this air rifle i can shoot through the bottom and top of a soda can with a .20
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Attachments
IMG_0190.JPG
the air rifle in comparison to my hand
IMG_0192.JPG
Airsoft BB damage on a board at 120 psi
IMG_0194.JPG
4 .177 bbs damage on board at 120 psi
Last edited by urgle the danish cow on Wed Mar 31, 2010 7:35 pm, edited 1 time in total.
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Unread postAuthor: mark.f » Wed Mar 31, 2010 6:38 pm

Click "edit" on your post and look under the textbox. There's a field for the file you wish to upload and a space for comments. Select the image on your computer, and add your comment, and then click "Add Attachment".
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Unread postAuthor: MrCrowley » Wed Mar 31, 2010 7:17 pm

This might help also (read my post in this topic as well if you want to upload it to Spudfiles):
http://www.spudfiles.com/forums/posting ... 13190.html
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Unread postAuthor: Mr.Sandman » Wed Mar 31, 2010 7:23 pm

Umm the bottom of a soda can with a .2 gram bb is only 350 fps. Im not sure where you are getting 520 fps from the bottom of a can.
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Yeah, it's that important.
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Unread postAuthor: urgle the danish cow » Wed Mar 31, 2010 7:25 pm

Mr.Sandman wrote:Umm the bottom of a soda can with a .2 gram bb is only 350 fps. Im not sure where you are getting 520 fps from the bottom of a can.
Mr. Sandman that is the speed of my dragunov

edit by MrCrowley: Please don't double post.

mark.f wrote:Click "edit" on your post and look under the textbox. There's a field for the file you wish to upload and a space for comments. Select the image on your computer, and add your comment, and then click "Add Attachment".
thank you sir
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Unread postAuthor: deathbyDWV » Wed Mar 31, 2010 8:25 pm

Looks good for a just spare parts. Nice work.
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