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fill point.

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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fill point.

Unread postAuthor: Mr.Russ » Tue Oct 23, 2007 2:58 am

would the fill point of my new piston valve have to be directcly behind the piston? or could it be at the end of the chamber. the whole gun is made out of 15mm PVC. the chamber is just and end cap, 2 45s and then a 90 degree leading up to the piston.
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Unread postAuthor: battlemonkey » Tue Oct 23, 2007 3:02 am

what type of piston? sealing barrel or sealing chamber? normaly you fill from behind the piston hence the need for equilisation holes
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Unread postAuthor: Mr.Russ » Tue Oct 23, 2007 3:13 am

its a barrel sealer. fill valve is a tyre valve.
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Unread postAuthor: battlemonkey » Tue Oct 23, 2007 3:15 am

yeah you need it to be behind the piston to push it forward
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Unread postAuthor: MrCrowley » Tue Oct 23, 2007 3:17 am

Unless you have a spring, but it's pretty hard to find the right spring, that isn't too strong or weak.
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Unread postAuthor: Mr.Russ » Tue Oct 23, 2007 3:19 am

would the shrader valve be sufficient enough venting for a 15mm hot glue piston? i can use the blowgun but i was just wondering because its gonna be a bit tricky to mount the blowgun and the shrader behind the piston. theres not going to be much room.
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Unread postAuthor: battlemonkey » Tue Oct 23, 2007 3:26 am

on my 20mm piston im going to use a blowgun and just tap it into the wll of the end cap
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Unread postAuthor: Mr.Russ » Tue Oct 23, 2007 3:28 am

yes i would do that except for my pipe is 5mm smaller. i figure i dont need a bumper either because theres a chunk of softish rubber on the end of the tyre valve that would work as a bumper.
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Unread postAuthor: Novacastrian » Tue Oct 23, 2007 3:29 am

Won't that be a bit awkward to hold/fire ?
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Unread postAuthor: Mr.Russ » Tue Oct 23, 2007 3:32 am

it doesnt matter that much. its going to be kind of piston likre ill make it work. but thats why i was wondering if the shrader will be sufficient to pilot it so i wouldnt have to cram a blowgun in.
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Unread postAuthor: battlemonkey » Tue Oct 23, 2007 3:33 am

i know it is bad but you can put t joint in with one end threaded put a threded cap in there and drill and tap the release valve there
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Unread postAuthor: Mr.Russ » Tue Oct 23, 2007 3:40 am

ill find a way. im just asking now it i can use the shrader to pilot it aswell.

no-one has seemed to answer that question.
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Unread postAuthor: battlemonkey » Tue Oct 23, 2007 3:45 am

i got it. get a old bike pump and take the clamping bit off it. when finished filling with other pump. put this one on and flick the lever at the back. should release the air.
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Unread postAuthor: Novacastrian » Tue Oct 23, 2007 3:46 am

If the flow is sufficient (piston movement minimal) ya it will work wid a schrader.
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Unread postAuthor: Mr.Russ » Tue Oct 23, 2007 3:50 am

im gonna just put the shrader into a male plug and test if it has suffiecnt flow but then if it doesnt i can always add a blowgun somewhere
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