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First Piston Cannon

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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First Piston Cannon

Unread postAuthor: frigaardj » Thu Jan 19, 2012 11:19 pm

This is my first cannon showcasing post on SpudFiles, although I have made other cannons in the past. This is also my first piston valve cannon, and is built around a 2" (50mm) tee.

Here are the specs:
- 50cm long 50mm SCH40 PVC chamber (giving for a 1 litre chamber approx.)
- Piston built from layered wood around 1/4" threaded bar. Sealing face made from 3 layers of bicycle inner tube.
- Pilot valve is 1/2" ball valve, mounted alongside shcrader onto 3/8" tee.

So far I have only done a few low pressure shots (30-40 psi) for fear of the neighbour's wrath. Even with this pressure it delivers some good recoil and demolishes lemons. Sometime this weekend I'll go somewhere remote and launch off some 100+ psi shots.

And the photos:

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Whole thing with barrel.

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Taken looking into the tee, before assembly.

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Detachable pilot end. (yellow is PTFE)

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Piston, front end to the left. (white stuff is lithium grease that has unfortunately soaked into the wood).

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Bayonet style breach loading - fast and effective.

TO DO:
- Fix slight leak on sealing face (very minor)
- Barrel support, and different bore barrels.
- Have fun.

Please post suggestions etc.


8)
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Unread postAuthor: Lockednloaded » Thu Jan 19, 2012 11:30 pm

Wow! Really clean first, congrats!

As far as suggestions go, you've got the major stuff covered. I do thing you should reduce the pilot volume by replacing the male adapter+cap with a threaded bushing. You should be able to improve performance that way and you could fit a more comfortable pilot valve as well
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Unread postAuthor: jackssmirkingrevenge » Fri Jan 20, 2012 12:46 am

Not bad, not bad at all.

I like the bayonet mount, but the way you made it a tight fitting projectile could rip it off with relative ease.

You would also benefit from a lighter piston, once you're making it on a threaded rod why not use washers instead of wood?
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Unread postAuthor: frigaardj » Fri Jan 20, 2012 1:11 am

Lockednloaded wrote:Wow! Really clean first, congrats!

I do think you should reduce the pilot volume by replacing the male adapter+cap with a threaded bushing. You should be able to improve performance that way and you could fit a more comfortable pilot valve as well


Thanks :)

Actually I have filled up all of that pilot volume with compressed newspaper around a small section of pipe, topped off with hot glue:

Image

jackssmirkingrevenge wrote:I like the bayonet mount, but the way you made it a tight fitting projectile could rip it off with relative ease.

Although it looks fragile in the photo, it is actually pretty rigid and I would have a hard time snapping it, but I will make it more solid on future barrels.
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Last edited by frigaardj on Fri Jan 20, 2012 7:16 pm, edited 1 time in total.
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Unread postAuthor: Gun Freak » Fri Jan 20, 2012 8:00 am

JSR, I think using washers would make it heavier, because you need at least 10 to hold the o-rings (maybe 12), and then nuts.

Nice job on the cannon, looks like it'll put a golf ball 200 yards easy.
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Unread postAuthor: mattyzip77 » Sun Jan 22, 2012 2:03 pm

simple, nice, clean build! Nice work! Sanding drums work well as a piston incase you wanna change it! I like it!!!
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Unread postAuthor: evanmcorleytv » Sun Jan 22, 2012 2:20 pm

very nice, and clean!! Excellent build!! Any videos yet?
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Unread postAuthor: frigaardj » Sun Jan 22, 2012 11:23 pm

Gun Freak wrote:Nice job on the cannon, looks like it'll put a golf ball 200 yards easy.

At 50 psi it puts a lemon about 150 metres (165 yards), although I haven't tried higher pressures yet.

[youtube]http://www.youtube.com/watch?v=ZwM9vcD-SjY[/youtube]
This is a video testing a frozen lemon into chipboard at 50 psi, seems to work well. All the other holes are also frozen lemons at 40-50 psi. I can't think of what it'll do at 120 psi!
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