SpudFiles

Gun Specification

Fill Valve: Heavy Duty Car Schrader Valve
Trigger Valve: Female Brass Ball Valve (Lubricated)
Building Material: Galvanized Metal Pipes (Working Pressure: 2000 psi)
Barrel Diameter: Interchangeable 2 Inch, 1 inch and 0.5 inch bores
Barrel Length: 25 Inches
Chamber Diameter: 2 Inches
Chamber Length: 13 Inches
Chamber Volume: 40 Cubic Inches
Fill Method: Track Pump for Portable Otherwise FRIDGE COMPRESSOR
Working Pressure: 350 psi
Ammo: Nuts and Bolts
Muzzle Velocity: 975 FPS (With 1" x 25" Bore, 7 gram nuts, 350 psi)


Hey Guys,
This is my first successful build of a pneumatic gun. Made it after several failed attempts. It is a high pressure air gun. I can fill it up to 600 psi with my fridge compressor but it takes almost 3-4 minutes so i usually do with 350 psi with my 600 psi pressure regulator. I have tried firing it at several objects. It totally destroys plastic objects with 7 gram bolts. I have even tested it on some stainless steel and food container of metal which it has both demolished. SO check out the pics and tell me wht u think....all comments are appreciated!

CHEERS

I'm very interested to know how you got that muzzle velocity... It's incredibly optimistic.

GGDT says you'd need to use a pressure OVER 9,000psi to get 975fps.

My ammo is a 5 gram bolt ....by default the ammo weight is set to 100 grams....thts probably the reason its showing 9000 psi!!! Ill upload a snapshot of my GGDT config soon mate!!!!

Cheers

In the original post, you said you got 975fps with 7g nuts, so that's what I put in, and using the correct valve configuration simulation along with my .75" estimation for a 1" metal ball valve at 9,000psi I get:

I like how the before and after destruction photos changed the type of can. 8) Cool if you can take a screw top can and make it into a soup can in one shot.

The high mass of the projectile is very forgiving for the slow valve opening time. The graph is showing at that pressure the acceleration is not very limited by the valve after about 1.5ms which is impressive for a ball valve.

Unless the chamber is not in the photo, that chamber and valve are not 2 inch.

What size is the valve? Either that or you have some very large floor tiles.

LoL ...ma floor tiles are 24" x 12"...and my opening time is less than 0.5 seconds with my lubricated spring action trigger! And the can are both of same material which is not thin aliminum like pepsi cans!

Mount that thing on a stock, and make it a spring loaded ball valve.
inspiration
I tested it with a guy I know, and it has more than three times the power of a hand-opened ball valve.

Also, the cans are made of very thin steel, there's not much needed to go trough.

Labtecpower wrote:Mount that thing on a stock, and make it a spring loaded ball valve.
inspiration
I tested it with a guy I know, and it has more than three times the power of a hand-opened ball valve.

Also, the cans are made of very thin steel, there's not much needed to go trough.

too right mate...ill upgrade it with a good spring soon ...my current spring is too cheap....ill probably add a good paintjob and laser sight too

CHEEERS MATe

Wow,those floor tiles are VERY SQUARE for 24''x12'', also, by size comparison to the xbox controller, you projectile, barrel, valve and chamber are 1''

a 2'' brass ball valve would be impossible, even if lubed, to open in 0.5 seconds by hand....Please post a photo of the Xbox controller next to the valve.... it will help clear up the confusion.

ALSO: that first can you posted... is a PVC primer can. something most of us on spudfiles know better than our own reflection.... and that IS very thin aluminum.

(The title of your image of the valve, says 1''... making your chamber also, 1'')

The soup can was shot more than once....hole going in both directions....
why?

Ok since every1 is so confused ill post up a video explaining everything and comparing all the sizes and the damage shots will be included!!!!! Hope that will clear the doubts!!!!

For Now Here Is A Size Comparison:

http://s1194.photobucket.com/albums/aa3 ... -00032.jpg


And ur right tht is a pvc primer/glue can frm ace hardware(thin but not as thin as pepsi cans)!


Cheers[/img]

I too noted the 1 inch valve.

My 1 Inch Ball Valve As Trigger

Then the photo showed the valve and chamber are the same size. Nice try on the most recent photo. A quick change from Galvanized water pipe to Black Iron pipe without a reducer or valve is noted.

Can you kindly provide a photo of the complete launcher with the 1 inch valve and 2 inch chamber all in one shot? Without it I tend to believe the launcher is vaporware. The only complete real launcher we have seen so far has a 1 inch chamber with a 1 inch valve. It is in the photo labeled

My High Pressure Air Gun With A Sling

The primer can is the undamaged can. What can is the damaged can?

And ur right tht is a pvc primer/glue can frm ace hardware(thin but not as thin as pepsi cans)!

I have personally found soup cans to be thinner than primer cans, though not as thin as Pepsi cans. I can open Pepsi cans by hitting one with a marshmallow. I have video showing it. Opening a soup can with a bolt is not that impressive.

Based on new data, GGDT predicts that the launcher has a muzzle velocity of 158fps:

Please note that the opening time is in milliseconds, 1,000ms is one second. You said you could open the valve in less than half a second, so I guessed .4s or 400ms.

lol thread, you should make a piston valve, so much more power than an ordinary ball valve

squidchicken wrote:lol thread, you should make a piston valve, so much more power than an ordinary ball valve

Agreed. Here is a 3.9 inch chamber with a 1 inch valve and 1 inch barrel. It punches holes in metal juice cans with candy. No problem.

Is it too much to ask for a photo of the 2 inch chamber, the 1 inch valve, and barrel all in one photograph?

Example photo below.

What is the scale picture showing?

Nothing in there is recognisable from the first.