SpudFiles

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.

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

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.

The hole would go all the way through everything except the rubber.

I'm sorry I thought the first post on this page was the how-to...

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.

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.

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.

Thanks for the pics, I have been trying to learn all I can about pistons and this was very helpful.

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&