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1000PSI Mini Monster Cannon ( Updated )

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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1000PSI Mini Monster Cannon ( Updated )

Unread postAuthor: Suicideneil » Mon Feb 22, 2016 10:36 pm

aircannonthumb2.jpg
Hello there, thought I would sign up and share my recent(ish) aircannon build.

As much as I enjoy seeing the large pvc builds, or rifle-type copper pipe guns, I decided to go a slightly different route and use a pressure-washer gun and some hydraulic fittings in order to achieve much higher pressures than normal. My inspiration for this build was the following project:

airsoft-pellet-database/topic19367-105.html

Ideally I wanted a 12/24v solenoid valve as the trigger, but finding one that can handle upwards of 1000PSI is hard to say the least- most use weird thread styles or cost as much as a good 2nd hand car. Regardless, I ended up using the pressure washer gun which has a 3/8" BSP inlet, and coupled that with various fittings including a ball valve and a quick-release connector to act as the filling port ( being filled via a PCP airgun pump rated for 3000PSI ).

The cannon was designed with versatility in mind, so as such I can change barrels easily- each one is mounted/mated to a 1/2" BSP fitting with epoxy and grub screws, with a small magnet acting as a de-tent. All projectiles are a very nice fit in their barrels so O-ring de-tents are not necessary, air loss or blow-by is minimal, with a very nice loud crack upon firing. :D

At present I have 3 barrels, a 7mm brass tube for 16" crossbow bolts, a 19mm aluminium tube, and a 22.5mm aluminium tube; the larger two barrels chamber steel ball bearings, empty Co2 cartridges, and an old Brushless motor rotor/magnet.

Power levels vary depending on ammo type, but with the current set up I can achieve upwards of 60ft/lbs of power and 130fps with my heaviest slug, or 30ft/lbs and 200fps with the lightest. Nothing record breaking but pretty respectable for a very compact cannon- I have just ordered some 1" BSP fittings to build a new air chamber that will hold roughly double the air capacity of the current set up, will do some testing once those arrive in a few days hopefully.

I won't bombard you with too many pictures- I have a project page on my WEBSITE, so here are just a few highlights:

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I also have graphs showing recorded weights, velocity and power of various projectiles and differing air pressures- currently I use 1000PSI, but in principle I can go upto 3000PSI... if I was that brave. 1500 is as high as I can go at present as there is a small leak in my cobbled together 'aircylinder', between the T piece and the first male to male adapter- PTFE tape can only do so much it seems. I will have more Dowty seals in my improved set up, and may replace the T with a 90 degree elbow if I can find one with nice large mating surfaces- Dowty seals simply won't work with the more slim-line fittings.

Anyway, this is my Cannon, hopefully you liked it and I will keep this thread updated as I make improvements. Cheers.
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Last edited by Suicideneil on Tue Apr 12, 2016 9:38 pm, edited 2 times in total.
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Re: 1000PSI Mini Monster Cannon ( working title :P )

Unread postAuthor: Gippeto » Wed Feb 24, 2016 12:08 am

To clarify...the pressure washer handle IS the valve? Might look into using it as a pilot for a piston valve...performance should increase noticeably.

Blue loctite makes a REAL good thread sealant...let it sit over night before using. Can take it apart with hand tools if needed..no heat required. Use it on pcps/booster pump @3000psi and my N2 fill setup @4500psi.
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Re: 1000PSI Mini Monster Cannon ( working title :P )

Unread postAuthor: jackssmirkingrevenge » Tue Mar 22, 2016 8:24 am

Ayyyy still inspiring people! Nice build!

Gippeto wrote:To clarify...the pressure washer handle IS the valve? Might look into using it as a pilot for a piston valve...performance should increase noticeably.


When you're using high pressure even a manual valve like this is pretty darn effective, especially if you use some sort of detent at the breech to delay the launch.
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Re: 1000PSI Mini Monster Cannon ( working title :P )

Unread postAuthor: Suicideneil » Thu Mar 24, 2016 4:49 pm

Yeah, the pressure washer is the valve- I really don't have the equipment or patience to machine or build a piston valve assembly- so long as I squeeze the 'trigger' sharply without jerking the whole cannon off target, it is extremely effective at dumping the air instantly vs a slower release of pressure.

I do have some blue thread lock as it happens ( r/c car enthusiasts should never be with out it, lol ), will have to try it if I still get a leak during future testing.

Anywho, I made a larger cylinder for more destructive goodness:

Image

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Now using 1" BSP fittings for most of the cylinder, holds roughly 3 times as much air ( 30 pumps vs 10 pumps to reach 1000PSI )- fitted a Picatinny rail to the side of the cylinder rather than the barrel to mount the horizontal grip; next job is to knock up a small mounting plate on top of the plastic body of the cannon to mount the lazer pointer permanently ( gonna use an L shaped piece of Aluminium glued to the top and side, with a short piece of Picatinny rail screwed and glued to that for the laser to mount onto ).

Was planning on doing some testing last week but that fell through ( I like it when people agree to call you and confirm plans, then you don't hear anything :| ), so hopefully I'll be able to do something sooner or later at any rate- this little monster demands shooting! :D
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Re: 1000PSI Mini Monster Cannon ( Updated )

Unread postAuthor: Ianbuckwell » Sat Sep 17, 2016 11:28 am

Those photos look very professional
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Re: 1000PSI Mini Monster Cannon ( Updated )

Unread postAuthor: Suicideneil » Sat Sep 17, 2016 1:13 pm

Ianbuckwell wrote:Those photos look very professional


Nothing like a plain white or black background and a few lights to really improve the quality of photos.

In other news, I've been watching Yoerg Sprave's videos on his insanely powerful air bow launchers- I'm gonna change my sketchy little ~150psi fill valve for a nice 3000psi check-valve, that way I know it won't fail on me and I don't have to deal with a giant handle sticking out any more. I'll pick up one of those in a week or so after pay day...
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