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3 inch piston

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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Unread postAuthor: richardbridges » Fri Sep 15, 2006 4:14 pm

metal washers - $0.12
rubber washer - $2.00
bolt - $0.45
o-rings $10.00 for 50
bell reducers - $0.99
Everything else is scrap 3" and 4" schedule 40 pipe. Boiled and pressed flat, then trimmed down on a drill press.

Not sure on the weight. Less than a pound though.
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Unread postAuthor: Infernal Maveric » Fri Sep 15, 2006 4:18 pm

Very well written, and highly detailed instructions on how to make that piston.

Just wondering...Shouldn't this have ben posted in the "How to" section of the forums?

Nice to have a price list aswell and hope to see more from you =)

Mav
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Unread postAuthor: badkitty » Wed Sep 27, 2006 1:49 am

so would the equalization holes be drilled into part #2 and 3 ...but not in the rubber..so air can pass out of piston but not back thru?....i just made mine, but wouldnt fire. tho i guess i did have too much gap between piston and inner cylinder. i also have aspring behind piston , which may not give it enuff travel..its like 1'' travel

i saw a design that didnt use o-rings, just the small gap between piston and wall...but mine is too great as the pressure equalizes too quick. good thing it was only out of 2'' and 1''pvc that i had around..no money really spent.
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Unread postAuthor: richardbridges » Wed Sep 27, 2006 6:01 am

The hole would go all the way through everything except the rubber.
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Unread postAuthor: SpudStuff » Wed Sep 27, 2006 11:04 am

I'm sorry I thought the first post on this page was the how-to...
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Last edited by SpudStuff on Wed Sep 27, 2006 6:57 pm, edited 1 time in total.
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Unread postAuthor: richardbridges » Wed Sep 27, 2006 3:22 pm

You say FK your mother what btch. Its pneumatic related. Not a how to. This is my piston I am working on, and thought that other people might find somthing usefull, and or give me some input.
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Unread postAuthor: )DEMON( » Wed Sep 27, 2006 3:28 pm

I find it hard to get perfectly flat pvc by boiling it. Have you tried to do that befor? When I did this my pvc was roughly flat but a little distorted and warped.
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Unread postAuthor: richardbridges » Wed Sep 27, 2006 4:46 pm

I used a large "C" clamp and two old table saw blades, but it left raised space in the center. I finally found metal cover plates for elecrical boxes that made everything easier. They are four inch by four inch, less than a dollar in any hardware store, and fit really nicely in a pot of boiling water. I will do a how to in a couple of days, with pics. I have blood poisoning at the moment and my wife won't let me do anything.
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Unread postAuthor: Mr.Taterhead » Wed Sep 27, 2006 5:59 pm

Thanks for the pics, I have been trying to learn all I can about pistons and this was very helpful. :D
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Unread postAuthor: MrCrowley » Wed Sep 27, 2006 6:41 pm

Piston Animation(all 3 types of pistons):
http://forums.spudtech.com/topic.asp?TO ... hichpage=1

How to make a barrel sealing piston(video):
http://www.bcvids.com/dload.php?action=file&file_id=4

How to make a co-ax piston out of a pringles can
http://www.geocities.com/cain333_2000/

My very own barrel sealing piston pringles can thingy:
http://www.spudfiles.com/forums/viewtopic.php?t=3609&
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