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piston construction

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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piston construction

Unread postAuthor: bikingpro911 » Sun May 18, 2008 9:35 am

ok here it is...im sure itll work but i wanna see what every1 else says about this. can i make a piston out of a 7/8" mm long socket, bike tube sealing face, long screw long enough to go threw the 7/8" bolt with a thick piece of flush robber at the end with a bike tube cut up a little bigger than the diameter of a 1" T and a washer at the end followed by a nut while in the back there is another flush piece of thick rubber with a cut up bike tube a little bigger than a 1" sch40 pipe towards the pilot valve so i can put the bolt itself into the 1" T to seal up right against the barrell pipe and in the back the bolt/socket is sleaved into the modified 1" sch40 pipe(i used rotary tool to shave out the inside a little) so then the back of the bolt/socket is towatrds the pilot valve and when i put pressure in the area no air will leak out...and ill have a T on the pilot valve and put a bike tube valve on the bottom part of the T to put air into the pilot area and the other end be facing towards the piston and the other end have a 3/4" cap sleeved inside the last end of the 1" T and have a compression fitting screwed into the back of that same 3/4" cap with a hose attached to the fitting with a blowgun thing at the end of the hose so i can let the air behind the piston out so it can slide back and let air passs threw the barrell tp propel the projectile?




sorry if it is alot and confusing but ull get it. op and i lubed the pistoin before i would put it in.


any advice would be VERY helpfull :D
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Unread postAuthor: jrrdw » Sun May 18, 2008 9:54 am

1st off you need to break up your description a little bit so it's understandable. Put a . after each point your describing and use capitals at the beginning of each sentence.

2nd use a drawing program to illustrate your design, it really helps your written description. Please fix those things in your description so we can help you.

MS paint is a excellent program for quick illustrations. Best of all it's free and very easy to use.
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Unread postAuthor: SpudFarm » Sun May 18, 2008 10:04 am

i really don't want to try to understand all those letters before you have done like jrrdw said so i throw in a diagram and you can try to understand that and say if it was something like that you meant
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Unread postAuthor: bikingpro911 » Sun May 18, 2008 2:03 pm

so then you need a hole going threw the piston to put air into the chamber?
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Unread postAuthor: SpudFarm » Sun May 18, 2008 2:10 pm

only if you have the piston completely sealed against the piston housing
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Unread postAuthor: bikingpro911 » Sun May 18, 2008 2:13 pm

ooo ok thanks alot
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Unread postAuthor: SpudFarm » Sun May 18, 2008 2:17 pm

to show you abit i throws in a pic of my piston.

Edit: ignore the red ring
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Unread postAuthor: bikingpro911 » Sun May 18, 2008 2:23 pm

crap thats almost like mine. i wish i had a cam but the front of it is bassically the same but i have another sealing face on the back and it is sleaved inside a 1" pvc pipe. nice
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Unread postAuthor: SpudFarm » Sun May 18, 2008 2:34 pm

this piston worked so well because:

1. the sealing face bent forward when filling so it filled up fast, and back when piloted to seal.

2. it was light

3. it har a "seal" at the back

4. i use another one now
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