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help with piston

Post about things you have launched or thought about launching. Also post about various materials used for building cannons. No posts about explosive projectiles!
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help with piston

Unread postAuthor: spudthug » Sat Mar 31, 2007 8:40 pm

ok basically i know how a piston works i searched the wiki and everything

[air goes in behind piston piston seals barrel rest of air goes into chamber...squeeze blowgun created a vaccuum pulls piston against pilot air goes from chamber to barrel...]

but i need a good diagram of it and i have nothing to draw it on...my dad is gonna help me build it at his shop but he needs a diagram to build it with me...he doesnt quit understand how to build it....


specs..

1. it is going to be a double chamber fire extinguisher gun and is going to be kinda like this
http://www.spudfiles.com/forums/viewtopic.php?t=4650&

2. it is going to be like that but with 1" piping and using only 1 port and a homemade piston...


all i need is a diagram of the inside of a psiton valve sitting in a tee so he understands...if u need to see the gun i will draw a diagram of how it is going to look in a bit..post if u do and if u want to draw a diagram
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4" piston valved cannon-half done..( i spilt my cement...)

Hybrid- 75% done. need to build propane holder and drill/tap sparkplug hole..
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Unread postAuthor: willarddaniels » Sat Mar 31, 2007 10:00 pm

Here is a pic of the guts of a supah: You can see where the piston seals the chamber on the right side of the piston. Imagine this inside a T and you've got it. I am weary of posting this pic and I don't want to exploit any further what Joel and others have done.
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Last edited by willarddaniels on Sun Apr 01, 2007 11:11 pm, edited 1 time in total.
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Unread postAuthor: A-98 » Sat Mar 31, 2007 10:05 pm

heh, so thats what the inside of a supah looks like. i was thinking of a totally different design. i wont ask anymore bout the workings of the valve, but my question is, how did you get that pic? do you have a supah?
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Unread postAuthor: willarddaniels » Sat Mar 31, 2007 10:30 pm

I got the pic from spudfiles, someone posted it a while back. I knew it would be a keeper so I saved it.
I do not have a supah... yet. I am currently making some of my own and experimenting on tweaking different areas of the valve. If I could just finish my other projects first... this is not a priority on the wife's honey-do list.
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Unread postAuthor: spudthug » Sun Apr 01, 2007 7:16 am

ok guys not to be mean but stop talking bout supahs and willard that is gonna be blocked in like a day...but i really need like a picture of like a homemade piston on the inside for my dad...i have seen one on here before but i cant find it again...
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4" piston valved cannon-half done..( i spilt my cement...)

Hybrid- 75% done. need to build propane holder and drill/tap sparkplug hole..
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Unread postAuthor: schmanman » Sun Apr 01, 2007 7:31 am

well, here's this....

it's a little off on size, but this is how my valve looks inside


click to view larger image-

Image
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Unread postAuthor: Kenny_McCormic » Sun Apr 01, 2007 8:44 pm

there was a wonderful set of animated diagrams of every type of piston valve on spudtech but now thats all gone.
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Unread postAuthor: willarddaniels » Sun Apr 01, 2007 11:22 pm

spudthug wrote:ok guys not to be mean but stop talking bout supahs and willard that is gonna be blocked in like a day...but i really need like a picture of like a homemade piston on the inside for my dad...i have seen one on here before but i cant find it again...

I took the pic off so as not to offend those with an unaligned ethical compass.
Honestly, if you you can't use a nice picture of the guts of a great supah to get an idea how to build one, you shouldn't mess with it. Do you really need someone to draw a picture with all the parts labeled along with the specs, tolerances, sizes of o-rings, tension of spring(s), air speed of an unladen swallow, number of screws, weight of hollowed-out pvc stock/piston, dia. of bore for pilot, etc.
With all the research you did, it should be pretty self-explanatory with a picture and then with the diagram schmanman provided.
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