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Possible pre-made 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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Possible pre-made piston

Unread postAuthor: LikimysCrotchus5 » Sat Apr 26, 2008 8:25 pm

I was searching on mcmaster just a little while ago and i was looking at the rubber section and i found rubber balls!

I think that they possibly may be good pre-made pistons because they will probable seal well and sizes are up to 8".

Im just worried about the weight as the balls get larger in size.

they are pretty cheap as well.

What do you guys think?

Example: 9957K15 on Mcmaster
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Unread postAuthor: ghostman01 » Sat Apr 26, 2008 8:45 pm

they should work if you can find good t's for them to fit in, spose thed also eliminate the need of o-rings .
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Unread postAuthor: LikimysCrotchus5 » Sat Apr 26, 2008 8:46 pm

Im just worried about, as i said before, the weight may be to heavy for the air to push.
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Unread postAuthor: Velocity » Sat Apr 26, 2008 10:19 pm

LikimysCrotchus5 wrote:Im just worried about, as i said before, the weight may be to heavy for the air to push.


It would have to be really heavy for the air not to be able to move it backwards; the main problem is that that material has a lot of friction, which might hold it back. However, a healthy serving of white lithium grease should do the job.
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Unread postAuthor: LikimysCrotchus5 » Sat Apr 26, 2008 10:32 pm

if you guys think that this is feasible, i might buy it to replace my current piston i have in my 4 inch cannon.

I think it would perform better but i am a little worried about a seal because at one time i had my piston with a rounded sealing face and that leaked a little but i got that fixed with a washer.

My current piston has friction on the sides on it when pushing the piston into the housing but then later gets easier. i did put white lithium grease on but i think it need so be a "Healthy Serving" just as velocity said.
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Unread postAuthor: Eddbot » Sat Apr 26, 2008 10:51 pm

if it is too heavy, you could drill holes all over the place and fill them with something lighter
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Unread postAuthor: ghostman01 » Sun Apr 27, 2008 3:18 am

OR high damage ammo ! lol
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Unread postAuthor: sniper hero » Sun Apr 27, 2008 3:58 am

I say you should buy and try
if it doesn't work you still have a funny thing
but what do you think about using it for ammo(just a few because of the price)

EDIT I see someone else was first to say the ammo idea
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Unread postAuthor: Gippeto » Sun Apr 27, 2008 11:59 am

If you sand the end of your barrel "true" to the bore of the tee , you should never have a problem with sealing.

Time consuming... yes, but it works. :)
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Unread postAuthor: LikimysCrotchus5 » Sun Apr 27, 2008 6:58 pm

Gippeto wrote:... "true" to the bore of the tee ...


I dont quite understand that phrase that i just quoted.
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Unread postAuthor: JDP12 » Sun Apr 27, 2008 7:01 pm

i think by true, he means flush
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Unread postAuthor: Velocity » Sun Apr 27, 2008 7:11 pm

I don't think that rubber balls would work so well as pistons. Flat sealing faces have worked well for me; anything curved at all can cause leaks.
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Unread postAuthor: THUNDERLORD » Sun Apr 27, 2008 7:24 pm

Sounds like a good idea to try.
And reminds me of JSR's pengun of course.
But I don't think the toy ones would work because they aren't very sturdy.
But all this does give me an ammo idea. 8)
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Unread postAuthor: LikimysCrotchus5 » Sun Apr 27, 2008 7:25 pm

The one i am talking about isnt a toy one, its from Mcmaster, i doubt its a toy.
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Unread postAuthor: THUNDERLORD » Sun Apr 27, 2008 7:30 pm

LikimysCrotchus5 wrote:this isnt a toy one, its from Mcmaster, i doubt its a toy.


That's why I was saying it sounds like a good idea to try.
But the actual idea made me think about the toy ones.
And maybe using them for ammo.
Oh the ricocchet possibilities (in particular) :wink: 8)
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