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new coax+homemade bullets

Built a pneumatic cannon? Then post it here! This section is for completed, finished cannons that you have built. Please include pictures and information.
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new coax+homemade bullets

Unread postAuthor: urgle the danish cow » Mon Apr 18, 2011 6:09 pm

this is a regular coax piston valve. it is .25 caliber and piloted by a 1/2 ball valve and filled via an ex-propane tank filled with air. my pump is in use so i can only use up to 120 psi :cry:
the airchamber is 3/4 inch copper and is sealed with epoxy.
the barrel is 3ft long and .25 caliber. the entire thing is threaded. it should have cost alot but it only cost $7 bc i bought it in the lamp section :D (not plumbing 8)
the piston is hot glue with 1 layer of masking tape around it for a smoother ride. the sealing face is rubber that is about 3 or 4mm thick and presses up against the end of the barrel which is lined in teflon to improve the air seal.
the bumper is a thick o-ring which lies in the 3/4 to 1/2 adapter

also i took my first try at casting my own bullets. the idea is not mine, i think i got it off one of the how-tos here so please speak up if i am using your idea bc it works well for me.
the block is two wood pieces with three .25 holes drilled roughly 15mm deep. i put flux on the inside and then use a blowtorch to melt solder into the holes. then i take off the clamps and retrieve my bullets.

the bullets work fairly well and with this gun at 100psi i blasted a hole through an empty spray-paint can. with airsoft bbs i can shoot very powerfully and about 100ft

i am satistfied with this gun and please comment


BTW I ADDED SOME PICS OF MY NEXT PROJECT IN THE MAKING JUST TO MAKE YOU WONDER :D :D
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Attachments
IMG_0331.JPG
the gun. it looks small but i had to stand on a stool to fit it in
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IMG_0333.JPG
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casting block
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bullets
IMG_0341.JPG
entry
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exit
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breech closed
IMG_0339.JPG
open
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urgle the danish cow
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Unread postAuthor: lemming124 » Mon Apr 18, 2011 10:13 pm

you should be satisfied it looks great! how is the barrel centred?
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Unread postAuthor: Gaderelguitarist » Tue Apr 19, 2011 12:19 pm

Why are you showing that very average coax alongside your next project which is quite obviously a machined piece of envy?

This inconsistency is bothering me. All neat stuff though. :lol:
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so many muchness
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Unread postAuthor: urgle the danish cow » Tue Apr 19, 2011 3:13 pm

lemming124 wrote:you should be satisfied it looks great! how is the barrel centred?

the barrel has a spacer on the inside made of duct tape rolled up and then 1/4 inch holes drilled through through the tape for air flow
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Unread postAuthor: jackssmirkingrevenge » Wed Apr 20, 2011 12:20 am

If you could get that lovely breech machined, why are you casting your slugs in a block of wood? Even a section of barrel material seems like a better idea.
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