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Pistonsss

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: Mr.Russ » Thu Sep 06, 2007 11:34 pm

okay i was just asking for a stupid reason, thinking there might have been a difference in socket lengths between the 2 brands because i was going to cut the deodorant can today, and i dont have the T yet.
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Unread postAuthor: MrCrowley » Thu Sep 06, 2007 11:37 pm

Any aerosol can is usually the same or very similar diameter so its not a huge f*ck-up if you do indeed f*ck it up. I went through 3 or 4 myself.
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Unread postAuthor: Mr.Russ » Thu Sep 06, 2007 11:42 pm

lol.

to empty your can did you just hold the nozzle down? ir take the nozzle off, and smack the white bit sticking out on the corner of a table to all the deodorant comes out?
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Unread postAuthor: MrCrowley » Thu Sep 06, 2007 11:45 pm

I put a nail through the side of it. Not best way to do it, but sure is the fastest.
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Unread postAuthor: Mr.Russ » Thu Sep 06, 2007 11:47 pm

smacking it in the corner of a 2x4 is probably the same :P


without the risk of a nail flying everywhere lol


anything that i can use instead of hot glue to reinforce? i have like one of them left lol
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Unread postAuthor: MrCrowley » Thu Sep 06, 2007 11:50 pm

Do you have a hole-saw around the same diameter? Cut a thick piece of wood out and stick it in there.

32mm fittings fit pretty good in the deo can as well.
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Unread postAuthor: Mr.Russ » Thu Sep 06, 2007 11:53 pm

i think i might have one..

would it be best do like 2 cuts so it goes right to the end of the can? cause i think that even if you did have a bumper the and of the can would still get damaged due to the pressure.
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Unread postAuthor: MrCrowley » Thu Sep 06, 2007 11:57 pm

What I did was filled about 1/4" of the piston can with hot glue, and stick a 32mm fitting in there and then hammered the deodorant can down around the outside of the fitting, then I bolted the bumper onto the back.

It's impossible for it to get damaged without the actually fitting getting damaged because when it slams back most of the energy is used through the bumper, but the little energy that is left, will be spread out across the fitting and the back of the can, and since the cans end is hammered down around the fitting, it is totally reinforced.
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Unread postAuthor: Mr.Russ » Fri Sep 07, 2007 12:05 am

thats a good idea. does it have to be a pressure fitting? if not ill buy a dwv because their cheaper lol(and im tight)


Did you use a coupling? i have an idea of a different way you could do it.. ill make a diagram
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Unread postAuthor: MrCrowley » Fri Sep 07, 2007 12:08 am

No it was a DWV fitting. Coupling could work I guess, I used a bushing.
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Unread postAuthor: Mr.Russ » Fri Sep 07, 2007 12:23 am

this is my idea.

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there will be an empty part in the piston so it is a bit lighter, and because of the bolt there the can wont crush. you can put your material for the bumper inside the end cap and have it cooming out, or just have it around the end.



does anyone know any way to make the OD of the piston any wider?

other than tape.
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Unread postAuthor: dongfang » Fri Sep 07, 2007 1:16 am

Hi,

Looks like it is going to be a nice valve.

The hardest part is always to get them to seal. If you trigger with a small valve, the piston to tee seal has to be pretty good, otherwise air is just going to hiss by it, maintaining the pressure in the pilot chamber (that you want to clear). So you might want to spend a little time looking for something really good before assembling. It must also be mechanically strong.

If you can find an o-ring or gasket that fills exactly the gap between them, perfect. Then, see if you can find some other pipe or other plastic part that can be cut to make 2 small support rings for the gasket - one on each side.

You might also want to fill some of the dead space in the pilot chamber with something so there will be less pilot air to get rid of before the valve fires.

Good lock with it :lol:

Regards
Soren
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Unread postAuthor: jackssmirkingrevenge » Fri Sep 07, 2007 3:48 am

Mr.Russ wrote:does anyone know any way to make the OD of the piston any wider?


Seal the gap at one end and pour in some epoxy to fill the gap :)
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Unread postAuthor: Mr.Russ » Fri Sep 07, 2007 7:21 pm

i dont have epoxy lol

im pov.


thanks soren. i figured if i install the blowgun and try piloting it with that, and it doesnt work the gun wont be broken because i would have to make the pilot valve bigger, so i wold just drill and re-tap the previous hole.

I dont think there would be too much dead space between the back of the piston and the end cap. i have to put the bumper in aswell.


Thanks for the feedback


EDIT: just one more question. In a barrel sealer, where should the piston be placed?

should it cover the top socket, and have a small gap so air can blow by into the chamber? or should it only cover half of the top socket, like in picutre number 2.
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Unread postAuthor: Rudesill Ballistics » Sat Sep 08, 2007 12:16 am

I would go with number one.
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