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Help me Build my 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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Help me Build my piston

Unread postAuthor: Marffy » Thu Dec 15, 2011 8:41 pm

I need help making my piston. I'm wondering What to use for everything. My shop class has a lathe so i'm thinking I can make the piston out of aluminum? I tried using foam balls for a bumper but it didn't work out well. And for a seal should i use a piece of bicycle tube or rubber sheets? I'll probably go to the hardware store this weekend so any suggestions for materials to use would be great. Also if you have picture of your piston and you posted that would be great. I really need some ideas...
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Unread postAuthor: Hawkeye » Thu Dec 15, 2011 8:57 pm

Your signature is delivering on its promise.
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Unread postAuthor: evanmcorleytv » Thu Dec 15, 2011 9:27 pm

are you using this for a small QEV, or a large barrel sealer?
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Re: Help me Build my piston

Unread postAuthor: velocity3x » Thu Dec 15, 2011 9:37 pm

Marffy wrote:I really need some ideas...


http://www.spudfiles.com/forums/piston- ... 23060.html
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Unread postAuthor: jackssmirkingrevenge » Thu Dec 15, 2011 10:00 pm

I would go for delrin/acetal or uhmwpe, even nylon if it's available. synthetics are easier to machine and lighter, giving you better performance for less effort.
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Unread postAuthor: Marffy » Thu Dec 15, 2011 11:39 pm

small. 1" piston.
Thanks for some ideas...
If i find some nylone stuff i'll use it.
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Unread postAuthor: jrrdw » Fri Dec 16, 2011 7:57 am

Member since July 2009 and such newbish questions? :shock:

Someone has not payed attention. I haven't had to say this in a long time but it's a 'fitting' time. UTFS!

There's a play on words in there to help you out if you can 'find' it. :roll:
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Unread postAuthor: Hawkeye » Fri Dec 16, 2011 8:12 am

Half the time at least a piston material can be found that's already a slide fit inside the pipe of choice so having a lathe etc. is irrelevant.
That means the average piston assembly requires cutting off a section of Delrin etc and screwing a pice of neoprene from roofing supplies onto the face.
A daunting task.
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Unread postAuthor: mattyzip77 » Fri Dec 16, 2011 12:11 pm

There are a million how tos here and on youtube! Do some research dude!!! Also I use a rubber sanding drum as a piston in one of my cannons and in my opinion its better than a bolt/washer piston. You can get them at harbor freight for like 8 bucks!! Good luck!!!
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Re: Help me Build my piston

Unread postAuthor: velocity3x » Fri Dec 16, 2011 2:22 pm

Marffy wrote:I need help making my piston


This is the 3rd time you've gone down this road and you STILL don't get it??? :roll: :roll: Maybe it's something you shouldn't attempt.

1St time: http://www.spudfiles.com/forums/viewtop ... tml#266636

2nd time: http://www.spudfiles.com/forums/viewtop ... tml#277029
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Re: Help me Build my piston

Unread postAuthor: jrrdw » Fri Dec 16, 2011 3:05 pm

velocity3x wrote:
Marffy wrote:I need help making my piston


This is the 3rd time you've gone down this road and you STILL don't get it??? :roll: :roll: Maybe it's something you shouldn't attempt.

1St time: http://www.spudfiles.com/forums/viewtop ... tml#266636

2nd time: http://www.spudfiles.com/forums/viewtop ... tml#277029


No more spoon feeding...or flaming necessary! Locked.
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