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V.A.L Piston Valved Antenna-Golfball-Nerf Launcher (video)

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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Unread postAuthor: MrCrowley » Sun Jun 01, 2008 4:16 am

Ah...plywood (3 pieces bolted together)

Hence the:
50mm plywood piston machined down on a lathe and water sealed
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Unread postAuthor: Stifler69 » Sun Jun 01, 2008 4:45 am

Ahhh thanks and soz
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Unread postAuthor: SpudFarm » Sun Jun 01, 2008 8:32 am

nice short and compact powerful gun!

i love it :)
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Unread postAuthor: VH_man » Sun Jun 01, 2008 9:23 am

you have convinced me to make a large-bore pneumatic......... im serious. the simplicity of this gun reminded me how simple it can be.

hmmm.......
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Unread postAuthor: bigbob12345 » Sun Jun 01, 2008 9:26 am

Great job
But do you really hate 12v compressors that much :lol:
But it gets good power, esspecially for the low pressure you used in most of the shots in the video.
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Unread postAuthor: STHORNE » Sun Jun 01, 2008 11:00 am

Very nice work Mr.C

Bah dah buh bah bah.....Image
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Unread postAuthor: elitesniper » Sun Jun 01, 2008 12:18 pm

HEY, is that a toilet plunger sealing face I see? :D Good job! I knew people would come to a sense that it makes a wonderful seal.
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Unread postAuthor: PVC Arsenal 17 » Sun Jun 01, 2008 12:20 pm

Do I see sliding barrel supports? Yes I do!!

I clap to you, MrCrowley, for making use of my favorite breech loading system.
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Unread postAuthor: clide » Sun Jun 01, 2008 3:58 pm

Nice gun as always, but how do you take that pilot plug off? It looks like you would have to take off several of the fittings starting from the outside and going in to be able to unscrew it.
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Unread postAuthor: MrCrowley » Sun Jun 01, 2008 4:28 pm

clide wrote:Nice gun as always, but how do you take that pilot plug off? It looks like you would have to take off several of the fittings starting from the outside and going in to be able to unscrew it.

Thanks, pfft it's just an easy 8-step process :D

I don't mind that much, there is nothing that can go wrong IMO. With the SGA I ended up gluing the end cap on and in over 50 firings, it's been perfect. The piston in this is so simple, basic and strong that I don't see me having to unscrew the pilot plug in the near future. Before the paint job I did have to replace the sealing face because the washer was a tiny bit too small, only took 10minutes to take the pilot fittings off.

I'm just worried about the paint work most of all, I had to paint the pilot setup black while it was on the cannon, otherwise my plumbing wrench would wreck the paint job.

spudfarm wrote:nice short and compact powerful gun!

i love it :)

Thanks, it's about 1.5m long with the 2" barrel, not that short :wink:
Must weigh around 7kg too.

VH_man wrote:you have convinced me to make a large-bore pneumatic......... im serious. the simplicity of this gun reminded me how simple it can be.

hmmm.......

Yay :D

bigbob12345 wrote:Great job
But do you really hate 12v compressors that much :lol:
But it gets good power, esspecially for the low pressure you used in most of the shots in the video.

Thanks, Ya huh, well it was broken...but still.

STHORNE wrote:Very nice work Mr.C

Bah dah buh bah bah.....Image

Hahhaha, nice one :P

elitesniper wrote:HEY, is that a toilet plunger sealing face I see? :D Good job! I knew people would come to a sense that it makes a wonderful seal.

I'm not sure. These are about 60mm in diameter with a ~15mm diameter hole in the middle.

I have seen bigger ones that are around 100mm+, but they're $12 so I don't bother.

Yeah it does make a great seal, best sealing face i've ever used. I used one on the SGA and my small co-axial.

PVC Arsenal 17 wrote:Do I see sliding barrel supports? Yes I do!!

I clap to you, MrCrowley, for making use of my favorite breech loading system.

Oh yeah, I forgot about the Omega project. Maybe subconsciously my mind was telling me how great a cannon it would've been and to put some features into my new cannon. :P

It's a great system, can't believe more don't try it. Simple, basic, quick loading, cheap...
Only thing is at 90psi the recoil knocks the golfball barrel out of the coupler because it can only fit about 2cm in. So i'll just sand the coupler down a bit and it should be fine.
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Unread postAuthor: elitesniper » Sun Jun 01, 2008 4:35 pm

I'm just worried about the paint work most of all, I had to paint the pilot setup black while it was on the cannon, otherwise my plumbing wrench would wreck the paint job.

A good remedy for this is to wrap some towels around the fitting then clamp on the monkey wrench, it shouldn't damage your great paint job :P
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Unread postAuthor: SpudFarm » Sun Jun 01, 2008 4:40 pm

i know 1.5 m is quite long but i meant like size/power :)
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Unread postAuthor: MrCrowley » Sun Jun 01, 2008 4:42 pm

Yeah i've done that before, it'd just be a pain because some of the fittings on here are really, really tight so they have the perfect angle.

But hopefully it will never come to that. :)

spudfarm wrote:i know 1.5 m is quite long but i meant like size/power :)

Fair enough :P
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Unread postAuthor: Tweetybird » Sun Jun 01, 2008 8:33 pm

Mr Crawley,

This cannon is rocking. Great design. Looks like it is very powerful at low pressure. I guess a piston will do that for you. Keep em coming, and you can put on a how to for the rest these slimy gits.
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Unread postAuthor: MrCrowley » Mon Jun 02, 2008 2:50 pm

Thanks Nick.

The instructable is done, i'm positive there are vague references or mistakes as I wrote it in one day, so please point them out.

How-To:
http://www.instructables.com/id/Golfbal ... -Build-One -That-Shoo/


I'll write it up for Spudfiles soon enough.
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