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TVBA-BBS

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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TVBA-BBS

Unread postAuthor: SniperMan » Sun Aug 27, 2006 7:51 pm

Cannon Name- TVBA-BBS (Triple valve, Bolt Action BB Sniper)
Type of Cannon- Pneumatic
Chamber Size- 50mm X 25cm ~700cc
Barrel Size- 7.5mm bore, 600mm long (7mm bb's)
Gas Source- Air Compressor @ 80psi
Valve- Machined aluminuim Piston valve with silicone seal. Actuated by a pneumatic solenoid valve - Permanently connected to air source, no need to 'recharge'!

Other Special Details:
Barrel is a 7.5mm aluminium tube sleeved in 1/2" copper pipe. I chose this design to create a bolt type mechanisim for loading bb's.
Magazine is contructed of 1/2" brass tube and holds 16+1 bb's
Rare earth magnets on either side of the barrel hold the bb in place until fired and also help with pulling bb's from the magazine
Scope is a Tasco 3-9X40 with laser assitance and backlight sight
MEASURED muzzle velocity of 152.6m/s @ 100psi (500FPS!) using home made chrono (IR led/reciever pair from mouse hooked to sound card)
Can generally group 10+ bb's within about a 3cm circle @ 15m

Currently working on:
Silencer... To be completed in the next day or two!

>>Video here!!<<
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Attachments
full.JPG
In all it's glory
Main_mech.JPG
Main valve mech - Air enters from the bottom and permanenetly pressurises the chamber. When the trigger valve is fired, it forces the solenoid valve to switch the old 'outlet' to vent via the air silencer (black and white thing)
bolt_close.JPG
The bolt mech - The grey goopy stuff is devcon 'plastic steel'. It holds the magnets in place. VERY strong stuff!
Bolt open.png
How the bolt works.
Bolt open.... BB drops into barrlel.
Bolt open.png (1.44 KiB) Viewed 6290 times
Bolt closed.PNG
Bolt closed. bb is held in place by magnets even when it is 'pushed' by the bolt.

The two mating parts are angled to make sure they mate well. There is also some teflon tape around the moving part to help seal and let the bolt slide easily.
Bolt closed.PNG (1.42 KiB) Viewed 6290 times
gel.JPG
Oh what fun there is to have with ballistics gel.... 9 parts water to 1 part gelatine by WEIGHT! (this was @ 15m, ~18cm penetration)
target.JPG
Closeup of target that i was shooting at. i think this was about 6 shots. Scope still needs some fine tuning (@15m again) - Video of this coming!!!
Last edited by SniperMan on Sun Aug 27, 2006 9:47 pm, edited 1 time in total.

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Unread postAuthor: ProfessorAmadeus » Sun Aug 27, 2006 8:02 pm

That my friend is TOTALLY AWESOME!! :D Thats really cool that you get to use ballistic gel. Isnt that really expencive?
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Unread postAuthor: SniperMan » Sun Aug 27, 2006 8:35 pm

It's the 'poor mans' ballistics gel.

Get 9 parts water to 1 part gelatine by weight, mix it up, throw it in a container, let it set (in the fridge) for a few days and voilla!

There are official gels and they are more controlled etc. but they are still just gelatine. Buggere'd if i'm gunna blow $300 on some gel for a bit of fun.

This mix is still probably 90% accurate to the real stuff.
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Unread postAuthor: singularity » Sun Aug 27, 2006 8:38 pm

where do you get 7mm and where did you get your solinoid valve. very impressive gun, a true sniper 8)
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be sure to check out my <a href="http://www.spudfiles.com/forums/ak-style-airsoft-vortex-gun-t10959.html">AK Styled Vortex Gun</a> and my <a href="http://www.spudfiles.com/forums/at-4-t9627.html">AT-4 Rocket</a>

upcoming projects... finalized clip fed BBMG and ball point pen sniper
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Unread postAuthor: SniperMan » Sun Aug 27, 2006 8:51 pm

the 7mm bb's were bought off ebay. The person i bought off did not list them, i had to ask then he done a tailored auction for me. He sells other bulk lot ball bearings tho.

Price at the local shop was 37c ea. These were 7c!!!

The solenoid valve is by SMC i believe. Festo also make similar vlalves. Not sure where you could shop for one. I can get the exact model of the valve if you like. I have one spare too if you want it (depending on location)
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Unread postAuthor: saladtossser » Sun Aug 27, 2006 8:54 pm

love that awesome realism
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"whoa... I thought pimpmann was black..."-pyromanic13
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Unread postAuthor: SniperMan » Sun Aug 27, 2006 9:23 pm

That is sorta what i was going for. I wanted something that was aesthetically right, not a big thing of tubes and stuff. I think i done a reasonable job of achieving that.
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Unread postAuthor: SpudStuff » Sun Aug 27, 2006 9:23 pm

Would Jello Work?
Oh ya, nice gun what kind of speed you gettin'.
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Unread postAuthor: beebs111 » Sun Aug 27, 2006 9:29 pm

maybe the plain flavored kind............
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in the upcoming presidential election, there will be several candidates who will be running, one of whom is Hillary Clinton. Now WAIT A SECOND!!! I though there was some sort of rule that prevented someone from serving more than two terms in office. Vote Against Hillary: Presidential Elections 08
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Unread postAuthor: SniperMan » Sun Aug 27, 2006 9:37 pm

You want plain old gelatine. Not dessert 'jelly'. Look for it in the cake decorating bit of your local shop.

If you read and not just looked at the pretty pictures you'd see i get 150m/s or 500f/s
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Unread postAuthor: experament_u2 » Tue Aug 29, 2006 2:18 am

very nice gun :D and the ballistics gel is a brilliant idea I think im going to try make some today :twisted:
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Unread postAuthor: MrCrowley » Tue Aug 29, 2006 2:44 am

where do you get gelatine from?love the gun,damn you and your machines :twisted: i would kill for one :wink: not that i can use one anyway.

p.s heres 300spudbux
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Unread postAuthor: SniperMan » Tue Aug 29, 2006 3:44 am

Thanks for that.

Silerncer on it's way... Got 90% of the parts now.

Going to be nice polished aluminium when done. Just have to machine up the two end caps.

Remind me again but i believe i'm not allowed to post plans?

I just got the gelatine from Woolworths...Cake decorating part... $10 worth should sort you for about 2 of the ones in the pic.
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Unread postAuthor: MrCrowley » Tue Aug 29, 2006 3:51 am

you can post plans,alot of people do to ask whether the design is effecient/will it work.post your plans if you want you wont get in trouble.
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Unread postAuthor: SniperMan » Tue Aug 29, 2006 8:12 am

Ok, i'll take some pics of the bits tomorrow and post them along with the theory.
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