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Mr.Russ Marble Sniper

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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Mr.Russ Marble Sniper

Unread postAuthor: Mr.Russ » Fri Oct 12, 2007 4:07 am

FINALLY i finished it. had the first few test fires today and it worked like a charm, minor leak but that is fixed.

Barrel: 85cm of 15mm PVC
Chamber: About 25cm of 50mm PVC
Valve: Modded sprinkler with bent guide rod (1/4" blowgun actuation)
Stock: 20mm PVC + fittings
Fill: Metal shrader valve

All fittings are PN18 and all of the pipe is PN12(except for barrel, PN18)

Back
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Front
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Fill point and gauge
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Back with Bi-pod
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Front with Bi-pod(and laser on)
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Showing the laser on(its fairly accurate considering i only lined it up with my eyes)
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Give me some comments on it?

thanks.
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Unread postAuthor: MrCrowley » Fri Oct 12, 2007 4:23 am

Very nice. Any damage shots? What's with the missing barrel in the first few pics?

I'm sure this will get asked, so i'll ask now... :P

What did you block the stock off with?
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Unread postAuthor: BOMBOMBOMB » Fri Oct 12, 2007 4:28 am

with a moded sprinkler valve does it work by:

Pressure Sprinkler
-------------->======
+ handle/blowgun
+
And when you pull the trigger it lets the pressure through or do you hook the blowgun up to soemm pressure and then when you pull it the valve pressurizes
Cheers Nato
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Unread postAuthor: Mr.Russ » Fri Oct 12, 2007 4:37 am

um i dont understand that^^

crowley, im gonna cop crap but i didnt block the stock off. too hard, aha.

i took the barrel off in the first couple of shots because it was too long and yeah.

no damage shots yet, opnly thing ive shot was a plastic clock at 40psi and thursto has a video of it on his camera.

maybe some damage shots tomorow, a bit of araldite still drying.
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Unread postAuthor: Marco321 » Fri Oct 12, 2007 4:37 am

She looks very nice i like it alot.

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Unread postAuthor: Thursto » Fri Oct 12, 2007 4:37 am

Hahaha Lol nice russ. Cant wait to test our babys at 100PSI :P:D LOl

have you sighted the laser in yet? Lol remember that box that we put a hole threw with airsoft BB's :D Lol

Nice work Mr. Russ
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Unread postAuthor: MrCrowley » Fri Oct 12, 2007 4:37 am

BOMBOMBOMB wrote:with a moded sprinkler valve does it work by:

Pressure Sprinkler
-------------->======
+ handle/blowgun
+
And when you pull the trigger it lets the pressure through or do you hook the blowgun up to soemm pressure and then when you pull it the valve pressurizes
Cheers Nato


It works like a piston valve, except instead of a piston, it's a diaphragm, which does the same thing. The blow gun is just the pilot valve, which you should know from the how pistons work topic you replied to.

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Unread postAuthor: BOMBOMBOMB » Fri Oct 12, 2007 4:42 am

ok i see wow its kinda like how you dont understand the thing and than cablamo it hits you and its all clear :P But i more meant on this particular gune does the air go into the top of the sprinkler valve via the pilot or through the side 1"pipe?
Cheers Nato
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Unread postAuthor: Mr.Russ » Fri Oct 12, 2007 4:42 am

Ohhh

i was amazed aswell.

I loaded a buckshot of BB's in, and shot through a side of a corrigated cardboard box at like 30 psi..

edit: bom the air goes in through the metal shrader and builds up in the chamber and above the diaphragm. you open the blowgun releasing air above the diaphragm, lifting the diaphragm up and allowing the air in the chamber to pass through out the barrel.
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Unread postAuthor: jackssmirkingrevenge » Fri Oct 12, 2007 4:46 am

looks a tad on the ghetto side but as long as it makes marble-sized holes in stuff, who cares :D

Since marbles are a consistent type of ammunition, you should be able to calibrate the laser for a fixed distance with reasonable accuracy assuming you fill to a constant pressure.

The problem with a laser dot is that since both traverse and elevation are off-centre, the sight will only be good for shooting at a fixed distance (+/-2 metres or so) so calibrate it at the range you plan on using it the most. By shooting at cardboard boxes at different ranges (set them up at say 10 metres, 20 metres, 30 metres etc.) and firing say 5 shots at each box, you'll know how much the projectile drops and veers off to the side and therefore how much you'll have to compensate for future shots.
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Unread postAuthor: BOMBOMBOMB » Fri Oct 12, 2007 4:49 am

Cheers haha im so happy i finally understand sprinkler valves and pistons yay. i dont care if you think im a noob because i am and all teh mroe power to us. Lol thanks for your help. And very ncie gun. Give it a paint job and post some damage pics
Cheers Nato
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Unread postAuthor: Mr.Russ » Fri Oct 12, 2007 5:47 am

thanks for all the feedback guys.

any suggestions for 15mm ammo other then potato, bb buckshot or marbles?

this isnt 1/2" pipe like in america its 15mm pn18(i think it could be sch 40 or 80.
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Unread postAuthor: jackssmirkingrevenge » Fri Oct 12, 2007 5:51 am

I would stick with marbles, heavy enough to fly reasonably straight and do damage, spherical so they don't need fins or rifling and consistently made so they will fly reliably.
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Unread postAuthor: MrCrowley » Fri Oct 12, 2007 5:53 am

What about paintballs?

You could get some shipped over from NZ for like $15 for shipping and $25 for 500 balls (it's like $9 in America for 500balls but the shipping would kill ya)
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Unread postAuthor: BOMBOMBOMB » Fri Oct 12, 2007 6:00 am

from NZ do you need a permit or anything if not link me witht he site pretty please :P
Nato
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