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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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Piston

Unread postAuthor: flamerz14 » Mon Jun 25, 2007 2:47 am

what can I use as a piston in a 1'' co-axial?also, oes it need a spring to push it back to its original position?
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Re: Piston

Unread postAuthor: jackssmirkingrevenge » Mon Jun 25, 2007 2:53 am

flamerz14 wrote:also, does it need a spring to push it back to its original position?


not necessarily, especially if you´re filling it from the pilot area.
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Unread postAuthor: flamerz14 » Mon Jun 25, 2007 3:04 am

In front of the pilot area..
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Unread postAuthor: Pyro Ninja » Mon Jun 25, 2007 3:06 am

you could making it out of hot glue........get some 1" pipe spray it with cooking oil spray........use you glue gun and squeeze glue into the pipe to the hight you want the piston to be.....wait till it cools.....pop it out..........drill a hole for a bolt....then bolt a 1" circle of neoprene on it..........a way to make nice circles of neoprene is to: make one end of the 1" pipe nice and shape like a potato slug cutter........push it into the neoprene hard and twist it a bit........i did this with a mouse pad and it made perfect circles :)
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Unread postAuthor: flamerz14 » Mon Jun 25, 2007 4:42 am

:D great idea..would'nt that need loads of glue? my glue gun fell 1m pus and the inside broke..i switched it on it didn't work.any other ideas for material?
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Unread postAuthor: jackssmirkingrevenge » Mon Jun 25, 2007 5:34 am

flamerz14 wrote:In front of the pilot area..


you´d better fill from the pilot area, otherwise a spring would be a good idea.

any other ideas for material?


You could always cast it out of epoxy :wink:
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Last edited by jackssmirkingrevenge on Mon Jun 25, 2007 5:39 am, edited 1 time in total.
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Unread postAuthor: chaos » Mon Jun 25, 2007 5:36 am

if you do use a spring make sure its only just strong enough to hold the piston there otherwise it will rob alot of the power.

:: jack that link dont work :wink:
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Unread postAuthor: jackssmirkingrevenge » Mon Jun 25, 2007 5:40 am

oh yes it does :P

and if you're using a spring make sure you're filling at a slower rate than the equalisation flow
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Unread postAuthor: lukemc » Mon Jun 25, 2007 9:35 am

flamerz14 wrote::D great idea..would'nt that need loads of glue? my glue gun fell 1m pus and the inside broke..i switched it on it didn't work.any other ideas for material?


microwave -good for hot pockets and glue sticks
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Unread postAuthor: flamerz14 » Tue Jun 26, 2007 3:18 am

jackssmirkingrevenge wrote:
flamerz14 wrote:In front of the pilot area..


you´d better fill from the pilot area, otherwise a spring would be a good idea.

any other ideas for material?
>

You could always cast it out of epoxy :wink:


Pilot is a ball valve..how do I fill from there?



lukemc wrote:
flamerz14 wrote::D great idea..would'nt that need loads of glue? my glue gun fell 1m pus and the inside broke..i switched it on it didn't work.any other ideas for material?




microwave -good for hot pockets and glue sticks


and microwave the pvc pipe mould?
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Last edited by flamerz14 on Tue Jun 26, 2007 3:52 am, edited 1 time in total.

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Unread postAuthor: jackssmirkingrevenge » Tue Jun 26, 2007 3:50 am

flamerz14 wrote:Pilot is a ball valve..how do I fill from there?


Can't you add a separate schrader? you could also glue one to a fitting that screws into the ball valve temporarily for filling.
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Unread postAuthor: flamerz14 » Tue Jun 26, 2007 3:54 am

snt that the same as filling directly in front of the pilot?
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Unread postAuthor: jackssmirkingrevenge » Tue Jun 26, 2007 3:58 am

wait a bit, there seems to be a bit of a misunderstanding.

ok, so you have:

main chamber - piston - pilot area

what i'm saying is the filling valve feeds the pilot area that then bleeds past the chamber to fill the main chamber.

It's if you're filling through the main chamber that you'll need a spring, otherwise you should be fine (providing that the flow betwen the pilot area and the main chamber is less than the flow from the filling valve)
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Unread postAuthor: MrCrowley » Tue Jun 26, 2007 4:19 am

flamerz14 wrote:snt that the same as filling directly in front of the pilot?


You could put a quick connect onto the end of the ball valve, fill your gun via air compressor, when your done close ball valve, when you want to shoot open ball valve.
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Unread postAuthor: flamerz14 » Tue Jun 26, 2007 4:24 am

Oooorrrr....i could put a spring.what kind of spring?
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